LIBRARY UNrVERSITY OF CALIFORNIA DAVIS IX, v./ DAVIS COPV 2 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES BULLETIN NO. 72 SAN DIEGUITO RIVER INVESTIGATION Lake Hodges VOLUME I TEXT AND PLATES EDMUND G. BROWN Governor HARVEY O. BANKS Director of Water Resources November, 1959 LIBRARY iUilVERSITY OF CALIFORNIA DAVIS STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES BULLETIN NO. 72 SAN DIEGUITO RIVER INVESTIGATION VOLUME I TEXT AND PLATES EDMUND G. BROWN [|/?%V"3a) HARVEY O. BANKS Governor r\\ "''2J^!^^1 Director of Water Resources November, 1959 Son DieguHo River ai the Pacific Ocean north of Del Mar. June, 1 95 1 TABLE OF CONTENTS Page LETTER OF TRANSMITTAL, STATE DEPARTMENT OF WATER RESOURCES ,.„... xii ACKNOWLEDGMENT xiii ORGANIZATION, CALIFORNIA WATER COMMISSION xU ORGANIZATION, STATE DEPARTMENT OF WATER RESOURCES . xv ORGANIZATION, CITY OF SAN DIEGO, CHAPTER I. INTRODUCTION 1 Authorization for Investigation •• ........ .0.0 2 Related Investigations and Reports ... . 3 Scope of Investigation and Report 5 Area of Investigation 9 CHAPTER II. WATER SUPPLY 13 Precipitation .... ...... 13 Runoff o. • 1^ Import and Export of Water 20 Import e..... • 20 Export ,0... 2U Grovind Water Hydrology oo.« 25 Geologic Considerations « .• 26 Ground Water Basins 27 San Pasqual Basin 30 San Dieguito Basin .......... . 31 Page RdmOnSL ^^Slll 0000«00«0000000000««000 JC. F^XICX v9. O&SXH oooo(»oooooooooooo«*ooo ^J Lake Hodges BasiB oo«oo<>oo>oo<>oo«<>«o«o 3u Qviali'fcy' Ox Water oooooooo-ooosooooo^oooo*© jix Standards of Quality for Water ,,.o..o<,oo..oo.o 36 Quality of Surface Water ,«ooo.o.....o...o.. 39 Quality of Ground Water oo.o.oo ........ u2 Inland Hydrologic Unit a„,oo...«o..o,<>.oo lil^ Central Hydrologic Unit <,».,.. .». U5 Coastal Hydrologic Unit ,,..o...<,o....... U6 Water Quality Problems oooo..ooo<.<.<.<.ooooo«» U7 Sea-Water Intrusion ,, ................ . I4.8 Other Water Quality Problsns in San Dieguito Basin , . , . U9 Nitrates in Felicita Basin oo.« = <.<. = <.o«»ooo. I4.9 Yields of Presently Developed Water Supply .,..<,........ 50 Ground Water Developments ..„.,,...<,.... ....o 51 Surface Water Developments ooo.<..->«<.o<.. ...... 53 Import ooooooo©oo..oooo«ooooooooo.o PU. CHAPTER III, WATER UTILIZATION AND REQUIREMENTS 55 Ground Water Extractions , .... <>.«<.o ........... . 56 Appropriation of Water ,<,o<>..ooo<>.»a.oo.»<>o.«o 58 Water Rights Litigation ...o©.©.......,......, 58 Past and Present Land Use 60 ii Page Probable Ultimate Pattern of Land Use.oooo.«ooooooo 61; Land. Classification oooooooooo.ooooooooo oU Land Use oooooooooooooooooooooooooo Op Unit Values of Water Use ooooo.oooooooo«ooooo«oo oo Factors of Water Demand ooooooooooooooooooooooo o ( Irrigation Efficiency oooooooooooooooooooooo of Irrecoverable Losses oooooooo<.oooooooo«oooo oo Permissible Deficiencies in Application of Water » o » » » » » o 68 Monthly Distribution of Demand for Water „ „ „ , » o <> <. « » » o 69 Water Requirements Within San Dieguito River Watershed „ o . . <. . , » 71 Pres ent Water Requirement ,o<.o»o<.ooo.o<..ooo<,oo<. 71 Probable Ultimate Water Requirement oooooo.o«ooooo. 73 Recreational Water Requirements o<.ooooo«oo<.<>»oooo 75 Supplemental Water Requirements Within San Dieguito River Watershed oooooooooooooooo<.«ooo»i.ooo /p Present Supplemental Water Requirements „oooo<,<,ooo«oo 76 Probable Ultimate Supplemental Water Requirements „ » » » o « » « 76 Water Requirements of the City of San Diego ,00000. o.<..»o 78 Present Water Requirements of the City of San Diego „ o o « . o o 78 Probable Future Water Requirements of the City of San Diego 0.0 79 Supplemental Water Requirements of the City of San Diego o o . o . . o 80 Present Supplemental Water Requirements of the City of San Diego oooooooooooooooooooooooooa oU Probable Future Supplemental Water Requirements of the City of San Diego „oooooooooooooooooooo oO CHAPTER IV o PLANS FOR WATER DEVELOPMENT 8U Plans for Importation of Water Supplies ««ooooooooooooo ok iii o « o o e o » o e « o • o 9 o e o o e eveeoooo o o o o Feather River and Delta riw . . ooooo**^^^^ CHAPTER VI, COMPARISON OF PLANS FOR WATER DEVELOPMENTS Development of San Pasqual-Main Lake Hodges Ground Water Basin , . Potential Surface Storage Developments Addition of Spillway Gates on Sutherland Dam Pamo "B" Reservoir ««o„.=.o. .««...•••• San Pasqual Reservoir »».<,«oo«o«oo«.oo.o Super Hodges Reservoir o.ooooo.oc.o.oo.. San Vicente Reservoir ooo«<.<.«o.o...o.... o o o e e e e o • • Page 8$ 88 88 89 91 92 99 100 loU 118 131 li;6 156 156 158 161 170 170 175 175 176 178 180 183 It Page CHAPTER VII « CONCLUSIONS AND RECOMMENDATIONS 188 Conclusions „ „ „ « » . . . = . . » <■ » = » « o <, « <. . « » <. . » o loo Recoiratiendations „„oo<..oo.o..oo<.<.o.o.oo»»o» lyo TABLES Table No . ^^gQ 1 Description of HycJrologic Unix.s and Subunits of San Dieguito River Watershed oo<.o«o..o«o 12 2 Stream Gaging Stations ±a San Dieguito River Watershed oooooeooonooooooooo.oo J-O 3 Estimated Mean Seasonal Precipitation and Natural Runoff in San Dieguito River Watershed „ . , o . . , 18 i^ Recorded and Estimated Ma^dmamp Miniraura, and Mean Seasonal Natural, R^onoff in San Dieguito River Watershed for the Period 191U-15 Through 1956-57 . . 20 5 Estimated Seasonal Imports and E3q)orts of Water Affecting San Dieguito River Watershed , <...... . 23 6 Gro-und Water Basin Data for Principal Basins . o . . . . . 29 7 Typical Mineral Analyses of Surface Water in San Dieguito River Watershed oo<.o.o<.oo.««.. liO 8 Typical Mineral Analyses of Ground Water in San Dieguito River Watershed e„ooo«o<>o.o.oo h3 9 Estimated Seasonal Yield of Local and Imported Water Supplies in Sa:a Dieguito River Watershed . . . 52 10 Number of Active Wells and Ground Water Extractions Friora Basins in San Dieguito River Watershed 57 11 Land Use in San Pasqual and San Dieguito Basins arid San Dieguito River Watershed for 1956=57 « . « . 62 12 Estimated Average Monthly Distribution of Seasonal Urban and Agricultural Demand for Water Within San Dieguito River Watershed and Demand for Water by the City of San Diego <,o«ooooo«oo 70 13 Present Mean Seasonal Water Requirements in San Dieguito River Watershed for 1956-='57 oooooo«« 73 lU Probable Ultimate Mean Seasonal Water Requirements in San Dieguito River Watershed ooo.o.oo.o. 7U 15 Probable Ultimate Kean Seasonal Supplemental Water Requirements of San Dieguito River Watershed . • » e 77 16 Probable Mean Seasonal Future Water Requirements of City of San Diego a«c>oooooo«<>oa«os 79 Ti Table No o Page 17 Yield of Presently Developed Water Supply of City of San Diego o » » o o « « . . » . » o . <, <. 82 18 Estimated Mear. Seasonal Supp].ementa]. Water Requirements of City of San Diego . , . . o « 83 19 General Features of Wells, Pumping Plants, and Conveyance Facilities at San Pasqual-Main Lake Hodges Basin o o o » o « « « . . » , » . . . » 97 20 General Features of Sutherland Dam and Reservoir With and Without Spillway Gates , o » « » . , . . . 103 21 Areas and Capacities of Pamo "F* Reservoir <> » o » . . » 106 22 General Features of Three Sizes of Dam and Reservoir at the Pamo "B« Site on Santa Isabel Creek o o , . o 112 23 Total and Additional Combined Safe Seasonal System Yields with Pamo "EC* Reservoir for the Period 19lii-l5 Through 1956-57 , o » <. » , » . , « » » , . 117 2k Areas and Capacities of San Pasqual Reservoir ,00000 119 25 General Features of Three Sizes of Dam and Reservoir at the San Pasqual Site on San Dieguito River 00. 126 26 General Features of Wells 5 Pumping Plants j and Conveyance Facilities for Ground Water Develop- ment Within San Pasqual Reservoir Area „ o o » « , » 128 27 Total and Additional Combined Safe Seasonal System Yields With San Pasqual Reservoir for the Period 1911;-=l5 Through 1956-5? <, o » o , o . . » . o I3I 28 Areas and Capacities of Super Hodges Reservoir ,00,. 133 29 General Features of Three Sizes of Dam and Reservoir at the Super Hodges Site on San Dieguito River 00. llil 30 Total and Additional Combined Safe Seasonal System Yields With Super Hodges Reservoir for the Period 19m-l5 Through 1956-5? 0000.00.... U45 31 Total and Additional Combined Safe Seasonal System Yields From Existing and Potential Plains of Development of the San Dieguito River Under Coordinate Operation With San Vicente Reservoir for the Period 191U-15 Through 1956-5? .0000,. IU8 vxi Table No . . Page 32 Combined Safe Seasonal System Yields and Additional Conservation of Local Water by Diversion of Spills and Reduced Deliv- eries of Imported Water for Existing and Potential Plans of Development for the Period 191ii-l5 Through 1956-57 . , . . l5l 33 Areas and Capacities of Enlarged San Vicente Reservoir „ c- .o. o =.....«..... . 152 3U ■ Estimated Capital and Annual Costs of Enlarging San Vicente Reservoir Under Existing and Potential Plans of Development in San Dieguito River Watershed and Additional and Total Com- bined Safe Seasonal System Yields for the Period 191i4-l5 Through 1956-57 .. o. ..... . 155 35 Estimated Average Value of Property Subject to Damage by Uncontrolled Floods in Principal Overflow Areas in San Dieguito River Water- shed for the Period 1958 Through 2007 159 36 Effect of Potential Conservation Reservoirs on Flood Magnitudes and Frequencies in San Dieguito River Watershed ..... . l62 37 Flood Control Damages and Benefits Resulting From Operation of Potential Conservation Reservoirs in San Dieguito River Watershed ........ . 167 38 Comparison of Yields and Costs of Alternative Plans for Development Within San Dieguito River Watershed .<,. ..... ... o.. . following 17U 39 Con^sarison of Yields and Costs of Alternative Plans for Development Within San Dieguito River Watershed and Enlargement of San Vicente Reservoir ,„. ........... . following I8I; viii PLATES (Plates 1"25 are bound at the end of Volume I) Hydrologic Units and Major Water Service Areas Lines of Equal Mean Seasonal Precipitation and Diagram of Mean Seasonal Natural Runoff Representative Characteristics of Seasonal Precipitation and Rimoff in San Dieguito River Watershed Location of Ground Water Basins,, Wells ^ and Surface Sampling Stations Areal Geology" Geologic Sections A=A« . B-B» p and C^-C Geologic Sections D=D' , E~E« , and F=-.F« Lines of Equal Elevation and Profiles of Ground Water Levels s San Pasqual Basin Lines of Equal Elevation and Profiles of Ground Water Levels, San Dieguito Basin Lines of Equal Elevation of Ground Water Levels, Ramona Basin Lines of Equal Elevation of Ground Water Levels, Felicita and Lake Hodges Basins Lines of Equal Net Change in Ground Water Level Elevation, Spring, 1952., to Fall„ 1957, Saxi Pasqual Basin Fluctuation of Water Levels at Selected Wells Relationship Between Average Water Level Elevation and GroTmd Water Storage Depletion. Present and Probable Ultimate Land Use Probable Ultimate Land Use in San Dieguito River Watershed and Future Water Service Areas of City of San Diego 13 Relationship Between Water Requirements and Local and Imported Water Supplies Affecting City of San Diego Plate No, 1 2 3 h 5 6=^A 6=.B 7»A 7=B 7=C 7"D 8 9 10 11 12 IX Plate No . Il| Existing and Potential Alternative Facilities for Water Supply Development in San Dieguito River Watershed and Ifejor Related Works 15 Relationship Between Ground Water Storage Depletion, Yieldj, and Average Depth to Ground Water in San Pasqual and Main Lake Hodges Basins for the Period From 19lU=l5 Through 1956=^7 Adjusted for Present Conditions 16 PotentiauL Water Supply Facilities for Planned Operation of San Pasqual-fein Lake Hodges Basin 17 Existing and Potential Alternative Surface Water Supply Developments Within San Dieguito River Watershed 18 Pamo Dam at Site "F* on Santa Isabel Creek, Reservoir Storage Capacity of l63,i;00 Acre-Feet 19 San Pasqual Dam on San Dieguito River, Reservoir Storage Capacity of 33.^,000 Acre-Feet 20 Super Hodges Dam on San Dieguito River, Reservoir Storage Capacity of 365., 000 Acre-Feet 21 Hydrology of Control of Floods by Reservoirs Operated for Water Consei'vation, Purposes in San Dieguito River Watershed 22 Economics of Control of Floods ty Reservoirs Operated for Water Conservation Purposes in San Dieguito River Watershed 23 Relationship Between Storage Capacity of Reservoirs and Capital Costs 2U Relationship Between Storage Capacity of Reservoirs and Additional Safe Seasonal System Yield 25 Relationship Between Additional Safe Seasonal System Yield and Average Annual Unit Cost APPENDIXES (Appendixes are bound in Volume II) Page Agreement Between the State Water Resources Board„ the City of San Diego, and the Department of Public Works ,„ and the Amendment Thereto j, Authorizing the Bo Geology and Ground Water of San Dieguito River Co Records of Monthly Precipitation at Selected Sites in San Dieguito River Watershed for the Period 1936=37 Through 1956-$? o . , . « c o o ., » » « » » <, « G-l Do Estimates of Monthly R\inoff From Selected Areas in San Dieguito River Watershed for the Period 191It-=l5 Through 19$6-57 000000000.. 00000 D-1 Eo Estimates of Seasonal Imports and Exports Affecting San Dieguito River Watershed „„oooooooooo. E=l Fo Mineral Analyses of Water 0000000000000000 F=l Go Applications to Appropriate Water and Recent Litigation Affecting Water Rights in San Dieguito River W3.X*€X^oXl6Q. 000 00000000000000000000 u^J. Ho Land Use.T Land Classificationp and Consumptive Use of Water in San Dieguito River Watershed „ o . o o o o H-1 lo Estimates of Monthly Evaporation at Selected Sites in San Dieguito River Watershed for the Period 1936=37 Through 1956=57 0000. .0000000000 I-l Jo Results of Subsurface Exploration and Soil Tests at Dam and Reservoir Sites in San Dieguito River ■•a.X'6Z^Sn6CL oooooooooeooooooooooooo "^-L iVo JliSX'ILnicL'b^S OX UOSoS 0000000000000000000 J\*=>X L, Results of Related Reservoir Operation Studies » . o . o L-1 XX FEY O. BANKS DIRECTOR EDMUND Q. BROWN OOVSRNOR ADDRESS REPLY TO P. o. BOX 38B Sacramento 2 1120 N STREET HI CKORV 9-4711 STATE OF CALIFORNIA ippattm^ttt at Watn ISi^BamaB SACRAMENTO April 10, 1959 Honorable Edmund 0. Brown, Governor, and Members of the Legislature of the State of California Honorable Charles C Dail, ^b.yor, and Members of the City Council of the City of San Diego Gentlemen: I have the honor to transmit herewith Bulletin No. 72, in two volumes, of the State Department of Water Resources, entitled "San Dieguito River Investigation". The investigation and report were financed cooperatively by the City of San Diego and the State of California pursuant to Item 224 of Chapter 1, Statutes of I956 of the California Legislature . This bulletin contains preliminary plans and cost estimates for alternative water conservation developments in the San Dieguito River watershed as well as pertinent data on the water resovirces of the area. Additional quantities of water from the San Dieguito River could be developed by increased utilization of ground water storage capacity and modification of existing Sutherland and San Vicente stor- age works. Although the new water yield so obtained would have a minimum \inlt cost, the quantity would be limited. Larger quantities of new water yield could be developed in the basin at higher unit cost by construction of surface storage reservoirs at either the Pamo "B" site or the San Pasqual site. The information presented in the bulletin should seirve as a guide for maximum practicable development of the water resources of the San Dieguito River. Very truly yours HARVEY . BAMS HARVEY d. BAMS Director xii 1 Ale ACKNOWLEDGMENT Valuable assistance and data -asei In this investigation were contributed by agencies of the Federal Governmentj cities, coimties, public districts 5 and by private companies and individuals o The De- partment of Water Resoui'ces gratefully acknowledges this cooperation „ Special mention is made of the helpful cooperation of the City of San Diego Water Department and the following: California State Division of Highways City of Escondido, Water Department Del Mar Utilities Escondido Mutual Water Company Pacific Telephone and Telegraph Company Poway Municipal Water District Ramona Irrigation District Ramona Municipal Water District Rincon del Diablo Municipal Water District San Diego Gas and Electric Company San Diego State College San Dieguiiio Irrigation District Santa Fe Irrigation District United States Fcres^ Serriee United States Geological Surrey, Surface Water Branch XXXI ORGANIZATION CALIFORNIA WATER COMMISSION A. Frew, Chairman, King City James K. Carr, Vice Chairman, Sacramento John P. Bunker, Gustine Richard H. Fuidge, Marysville John W, Bryant, Riverside William H„ Jennings, La Mesa Kenneth Q, Volk, Los Angeles George B. Gleason Chief Engineer William M. Carah Executive Secretary XXV ORGANIZATION STATE DEPARTMENT OF WATER RESOURCES Harvey 0. Banks » , . . . Director of Water Resources Ralph M. Brody'''' <, . « . . Deputy Director of Water Resources William L, Berry ..o ....... . Chief, Division of Resources Planning SOUTHERN CALIFORNIA DISTRICT Max Bookman ...... ...... District Engineer This investigation was conducted and bulletin prepared under the direction of Jack J. Coe ..... ..... Senior Hydraulic Engineer by John 0, McClurg .... .... Associate Hydraulic Engineer and Seymour P. Cohen o « . . . . . Assistant Hydraulic Engineer Leonard M. Rodney ................ Assistant Civil Engineer Allan Deutsch ........... .....,,. » Junior Hydrographer assisted by Edward E. Jackson ... . , Senior Hydraulic Engineer Arnold F. Nicolaus Associate Hydraulic Engineer Zeph J. Harrison ..... Associate Real Property Appraiser and Negotiator Raymond P. Spencer ... Civil Engineering Associate Peter Jones . . ......... Assistant Hydraulic Engineer Leonard I, Prager .............. Assistant Hydraulic Engineer Joseph Co Harker ................ Assistant Civil Engineer Richard J. Suszko . <, . Junior Civil Engineer Burt A. Babcock . Junior Engineering Geologist Dale L. Roberts .... Junior Engineering Geologist *■ Mr. M. J. Shelton was Deputy Director of Water Resources from jTily $, 1956, to January 1$, 1959. XV Water quality studies were c000 from each party J, amounting to a total of $68j,000 for the entire investigation. The basic agreement and the amendment thereto appear in Appendix A of this report. Related Investigations and Reports In 19145,5 at the request of the City of San Diego and after enact- ment of Chapter 62 ^ Statutes of 19^5 and Item 275<, Budget Act of 19U5i, by the State Legislature^ the former Division of Water Resources initiated a comprehensive investigation of water supply, water utilizationj and flood control development in the San Dieguito River watershed. Results of the investigation were published in 19U9si in Division of Water Resoiirces Bulle=- tin Noo 55j) entitled "San Dieguito and San Diego Rivers Investigation". Based on the results of that investigation, the following recom- mendations were made? "lo That Sutherland Dam b© completed substantially as originally designed to provide a reservoir with storage capacity of 365700 acre=feetj, and that a gravity conduit be constructed to transmit water yield to San Vicente Reservoir^ the project to be undertaken as soon as is practicable „ "2o That an enlarged Hodges Dam,, to provide a reservoir with the estimated 310<,000 acre-feet of storage capacity required in con= junction with Sutherland Reservoir for complete conservation develop^ ment of siirface runoff in Saui Dieguito Basin, together with necessary pumping plant and conduit to transmit water yield to the City of San Diego J, be constructed approximately ten years in advance of anticipated need for supplementary yield therefrom, "♦30 That a program be initiated as soon as is practicable for acquisition of lands „ easements and rights of way necessary for con- struction of an enlarged Lake Hodges with storage capacity of 310,000 acre-feet. =.3= ™ii» That a system of pi^nping wells arid collecting pipe line in San Pasqual Vall^j of sufficient capacity to lower the water table and effect salvage from natural consumptive use, be con- structed when growing water demands o€ the City of San Diego indicate a need for such supplementary yield, "5, That Fyear period 1891-92 through 19liO-Ul5 was 19.86 inches* San Dieguito River has an estimated mean seasonal natural runoff, at its mouth, of U3ji;00 acre-feet. The river extends southwesterly from the con- fluence of Santa Isabel and Santa Maria Creeks, southeast of the City of Escon- dido, and discharges to the Pacific Ocean about one mile north of the community of Del Mar and approximately 20 miles north of the downtown portion of the City of San Diego, Guejito, Black Canyon, and Temescal Creeks, draining the north- eastern sector of the watershed, are the main tributaries of Santa Isabel Creek. Santa Maria Creek and its tributaries drain the southeastern portion of the watershed. Runoff in the watershed is partially controlled by Sutherland Dam on Santa Isabel Creek, northeast of Ramona, and Hodges Dam on the San Dieguito River, southwest of the City of Escondido. These facilities are owned and operated by the City of San Diego, The San Dieguito River watershed contains numerous alluvial ground water basins, of which San Pasqual Basin is the most productive underground reservoir, Margr wells for local use are drilled into the decomposed granitic deposits found in the hilly areas. Although land use in the area of investigation is principally agri- cultural in nature, there has been a noticeable increase in urban develop- ment in the vicinity of the City of Escondido and along the coast at Del Mar in recent years. A special census of the City of Escondido in 1957 found the population to be 10,0^0 persons, as compared to a population of 6,$Uli in 1950. -10- Irrigation districts have operated in the watershed since 192? and, more recently, several municipal water districts have been organized, primarily to receive and distribute imported Colorado River water to service areas within the watershed. To aid in the analysis of the water problems and the evaluation of water resources and requirements within San Dieguito River watershed, the area was divided into three hydrologic units, "Inland Unit", "Central Unit", and "Coastal Unit", and seven hydrologic subunits. These are shown on Plate 1 and described in Table 1. Location of streams, existing dams and reservoirs, cities, major water service agencies, and principal roads are also shown on Plate 1. =11- TABLE 1 DESCRIPTION OF HYDROLOGTC UNITS AND SUBUNITS OF SAN DIEGUITO SEVER WATERSHED YfydTolo^c unit and subunit Inland Unit Sutherland Subunit Pamo Subxinit Ramona Subunit Guejito Subunit Boden Subunit Subtotal Central Unit San Pasqual Subunit Hodges Subunit Subtotal Coastal Unit Subtotal TOTAL Description : Area, : in : square miles Drainage area above Sutherland Dam Drainage area between Sutherland Dam and U.S.G.S. gaging station on Santa Isabel Creek near Ramona (Pamo) Drainage area above U.S.G.S. gaging station on Santa Maria Creek near Ramona Drainage area above U.S.G.S. gaging station on Guejito Creek near San Pasqual Drainage area between U.S.G.S. gaging stations on Santa Isabel Creek near Ramona and near San Pasqual 5U.0 57.5 57.0 22.1i 16.6 207.5 Drainage area between Inland- Central Unit boundary and above U.S.G.S. gaging station on San Dieguito River near San Pasqual Drainage area between U.S.G.S. gaging station on Sain Dieguito River near San Pasqual and Hodges Dam Drainage area below Hotfges Dam I|1.2 53.2 il3.0 9U.U U3.0 -12- I CHAPTER II „ WATER SUPPLY The principal source of water supply in San Dieguito River water- shed is direct precipitation, occurring almost entirely in the form of rainfall. Imported Colorado River and San Luis Rey River water serves as a supplemental water Supply in the Escondido area. Colorado River water also satisfies a portion of the water requiranents within the watershed west and southeast of Lake Hodges „ The magnitude of precipitation and resulting stream flow varies erratically over a wide range « Ground water is utilized extensively throughout the watershed both in the valley and hill areas. Precipitation Bulletin Noo 5$ described UO precipitation stations and pre- sented value of estimated mean seasonal depths of precipitation at 31 stations in or near the San Dieguito River watershed. The type and occurrence of storms and the characteristics of precipitation in the water- shed were also discussed in that bulletin. Precipitation studies undertaken during this investigation were limited to collection and compilation of records of precipitation at Hodges Dam, San Pasqual Valley, Sutherland Dam, and Escondido stations. Precipitation records at Hodges Dam, San Pasqual Valley, and Suther- land Dam stations were used in surface reservoir yield studies. Records of precipitation at the San Pasqual Valley station were also utilized in studies -13- of the operation of San Pasqual ground water basin. Records and estimates of monthly precipitation for these three stations for the period 1936-37 through 1956-57 appear in Appendix C to this report. Long-time mean seasonal precipitation data included in Bulletin No. 55 were used to determine the portion of the present and probable ultimate water requirements within the watershed which could be satisfied by precipi- tation. The estimated mean seasonal depth of precipitation over the entire watershed is 19.86 inches and varies from less than 10 inches at the coast to over 32 inches in the vicinity of Volcaui Mountain. Estimated mean sea- sonal depth and total quantity of precipitation for the hydrologic units and subunits for the 50-year period j 1891-92 through 19U0-lils are presented in Table 3« Lines of equal mean seasonal precipitation and location of selected precipitation stations in or near the watershed are shown on Plate 2. The station numbering shown on Plate 2 is that used in Bulletins No, h8 and 55. During the 82-year period, from 1875-76 through 1956-57, seasonal precipitation at the United States Weather Bureau station at Escondido has varied widely, ranging from an estimated maximum of 39«77 inches in l883-8ii to a minimum of 5.96 inches in 1893-9U. From 19U14-U5 through 1956-57, above-normal seasonal precipitation occurred only in the 1951-52 season, restilting in a precipitation deficiency of about 51 inches for the 13-year drought period. Recorded and adjusted seasonal precipitation at Escondido for the period 1875-76 through 1956-57^ and the accumulated departure from mean seasonal precipitation at this station for the same period, are shown on Plate 3. -lU- Runoff San Dieguito River is an intermittent stream, although it fre- quently flows for protracted periods,,. Effluent from San Pasqual ground water basin resulted in intermittent flow in the San Dieguito River above Lake Hodges until 195Us when seepage ceased due to declining ground water levels, Santa Isabel, Santa Maria, Guejito, Black Canyon, and Temes- cal Creeks are also intermittent streams throughout most of their length. The earliest measurements of runoff in the San Dieguito River watershed were made in I9060 Records of stream flow for Santa Isabel Creek at Sutherland Dam and at Pamo dam site, located approximately four and one- half miles north of Ramona, commenced in 1912 , while records of flow in the San Die^ito River at Hodges Dam started in 1916, United States Geo- logical Survey and privately-operated stream gaging stations, currently or historically located in the watershed, are described in Table 2„ Lo- cations of these stations are shown on Plate 2„ The station numbers shown on Plate 2 are those used in Bulletins No. hB and 55. In consideration of the length of runoff records and the number of active stream gaging sta- tions, no additional stations were installed by the State Department of Water Resources for purposes of this investigation. ^15- % o 3 5 t< as » W 01 CM cQ cQ )j-5 H (^ o CM VA ir< <« (H CM irv^ WNCM p^ (PO CO CO ^r\lrsc-lc^J-((-lac^cf, p4 csS c>> m !s (( B b b a • > > o o •< CM CM O iH CM ^^^ c^ PS cs cs c*s ■? B 9 i. S I I* o • ^ b b o o o WW w Go 3) 9 9 9 9 9 ea a n a o 9| 99 9 1/1 us Ul V) v> c^?\j- CSC S a {.9 9 3 t b M «3 ♦< rM o iH 9 ■H «.< O O 9 CS B 9 c O •o u 9 9 ■ B 9 m 9 d 9 10 9 -a ■§g * (I '^ 6 9 — '&$ 4 .O O -0 • ■« 9 •9 ♦? =16- Recorded and estimated values of monthly rxinoff from selected areas in San Dieguito River watershed for the period from 19ll;-l5 through 1956=57 are contained in Appendix Do Mean seasonal natural runoff in San Dieguito River watershed during the Ii3-year period ;, 19lU-i5 through 1956-575 closely approached the long-time mean seasonal natural runoff for the 53-year period l89l;-95 through 19U6-i;7ji used in State Water Resources Board Bulletin NOo 1, The mean values of runoff used in the current study are those for the period from 19li|-l5 through 1956-57 o Estimated mean seasonal natural runoff of the San Dieguito River, at its mouthj is li35i|00 acre-feet^ and at Hodges Dam is 1;1,200 acre-feet. Santa Isabel Creek ^ the most productive tributary^ has an estimated mean seasonal natural runoff j at Sutherland Dam, of lUjOOO acre-feet » Estimated mean seasonal depth and total quantity of both precipitation and r\moff, in hydrologic units and subunits^ -within the San Dieguito River watershed are presented in Table 3o Plate 2 illustrates diagrammatically the mean seasonal natural rimoff of the San Dieguito River and its major tributaries. =17= TABIE 3 ESTIMATED MEAN SEASONAL PRECIPITATION AND NATURAL RUNOFF IN SAN DIEGUITO RIVER WATERSHED U, Hydrologic unit and sub-unit Mean seasonal precipitation Mean seasonal natural runoff § Depth;, ! ;in inches; Acre-feet Depths I ° Acre-feet jin inches; Inland Unit Runoff, in per cent of precipitation Sutherland Subunit 2-7,92 80,li00 I1.86 111, 000 17. U Pa mo Subunit 2U„i|l 7U,900 3.10 9,500 12.7 Ramon a Subunit 19.66 59,700 1.70 5,200 8.6 Guejito Subunit 20,85 2ii,900 2.51 3,000 12.0 Roden Subvinit 17.36 I5,i|00 2.60 2,300 15.0 Subtotals 255.300 3li,000 Averages 23.08 3.07 13.3 Central Unit San Pasqual Subunit I6.l|li 36,200 l.lll 3,100 8.6 Hodges Subunit 15.98 Ii5,Uoo 1,I;1| il^lOO 9.0 Subtotals 81,600 7,200 Averages 16,19 1.U3 8.8 Coastal Iftiit 12,li2 28,500 0,96 2,200 7.7 TOTALS 365,U00 li3,l|00 AVERAGES 19.86 2,36 11.9 The quantity of runoff from the San Dieguito River watershed has fluc- tuated erratically from year to year in a manner similar to precipitation. Since December, 1912, recorded seasonal runoff of Santa Isabel Creek at Sutherland Dam has varied from a minimum of 6IO acre-feet in 195U-55, to a maximum of 95,200 -16- acre=feet in 19l5=l6o In 1915-16 the estimated runoff of the San Dieguito River at Hodges Dam -mas 11^ per cent of the seasonal meano Commencing in 19U3-UU,i the San Dieguito River -waterslied has ex= perienced the most severe drought of record, with runoff being below normal in each year except 195l"52o Maximum, minim\ira5 and mean seasonal natural runoff by hydrologic units and subunits within San Dieguito River watershed for the period from 1.9'lh'-1$ through 1956-57 is presented in Table 1;. Recorded and estimated seasonal runoff and the accumulated departure from mean seasonal runoff of the San Dieguito River at Lake Hodges for the period ISST-'SS through 1956-57 is illustrated on Plate 3o "19= TABLE k RECORDED AM) ESTIMATED MAXIMUM, MINIMUM, AND MEAN SEASONAL > i^' NATURAL RUNOFF IN SAN DIEGUITO RIVER WATERSHED -^ee. FOR THE PERIOD 19ll|-l5 THROUGH 1956-57 Hydrologic unit and subunit Seasonal natural runoff Maxim\im Minimum Acre-feet i Season 8 Acre-feet ; Season -'Mean, in -* acre-feet Inland Unit Sutherland Subunit 9$, 200 1915-16 610 1951i-55 ll;,000 Pamo Subunit 5U,200 1915-16 160 195U-55 9,500 Ramona Subunit la, 500 1915-16 1920-21 1933-31; 19l;9-50 1950-51 1955-56 1956-57 5,200 Guejito Subunit 25.300 1915-16 120 1956-57 3,000 Roden Subunit 18,000 1915-16 80 l95I;-55 2,300 Central Unit San Pasqual Subunit 33,500 1915-16 30 1918-19 3,100 Hodges Subunit U5,6oo 1915-16 1918-19 19l;9-50 1950-51 1955-56 1;,100 Coastal Unit 20,000 1915-16 1918-19 19l;9-50 1950-51 1955-56 2,200 In^jort and Esqjort of Water Import Escondido Irrigation District, predecessor of the Escondido Mutual Water Company, with a service area lying partly -mithin the San Dieguito River -20- ■watersheds first diverted -water from the San Luis Rej River in l895o The quantity imported from this source since the season of 1936=37 has varied bet-ween 900 and l;j290 acre=fest per seasono Recent imports from the San Luis Rey River, as a result of the current droughty, have been reduced someTwhat and average about 2^U00 acre=feet for the past three seasons. The San Diego County V/ater Authority^ a member agency of The Metropolitan Water District of Southern California, consisted of 17 member agencies on June 30., 1957.1 representing an area of li3iis53U acres j a popular tion of 783y550 personsn and a 1957-58 assessed valuation of $l.,00l5006s270. The City of Esoondido., Rincon del Diablo Municipal Water District^ Poiway Municipal Water Dlstrico^ and Santa Fe Irrigation District lie partly within San Dieguito River watershed and., as a result of their membership in the San Diego County Water A'^ithority,, are receiving imported Colorado River water from the San Diego Aqueducto Escondido Mutual Water Company, although not a member of the San Diego County Water Authority ;, receives Colorado River -vvater through the facilities of Rincon del Diablo Municipal Water Districto All Colorado River ■water received by Santa Fe Irrigation District is released from the San Diego Aqueduct into the San Dieguito River at a point south of the City of Escondido^ flows into Lake Hodges _, and is conveyed by flume from Lake Hodges through the San Dieguito Reservoir to the District service area. In recent yearso the afoi'e-mentioned member agencies of the San Diego County Water Authority have purchased more than their entitlement of Colorado River water. Furthermore., the City of San Diego haSp in the past, agreed to purchase and store Colorado Rrwer water during the winter months in order to permit the delivery of sufficient water from the aqueduct, during summer months^ to member agencies having inadequate reg\ilatory storage capacity. It is anticipated that Ramona Municipal Water District, iriiich joined the Authority in 1957? will soon be purchasing and distributing imported Colorado River water. The proposed Olivehain Municipal Water District and proposed annexations to Ramonaj Poway-j and Rincon del Diablo Municipal Water Districts and the City of San Diego will further expand the total area of the Authority and the area in the watershed eligible to receive imported Colorado River water. Estimates of seasonal imports of Colorado River and San Luis Rey River water to the San Dieguito River watershed are set forth in Table 5 apd Appendix E, which also contains a description of the previously mentioned water importing agencies. Location of the service areas of agencies importing water to the watershed is shown on Plate 1. -22- CO o J ^ o CO tH gg O c5 Ah W S H M Q CO o H E-i O EH W CO EH § +3 o M o % 0) o EO o -P in U C -H Q) (D TO d > -p CO M-rj g •H Q CD 0) ■H !> h pi ;H Q) hJ m 4^ CD >5 IS H nJ -P O Eh CO ^ cfl (D 0) ^ > P °^ H o o o o o o CVS J- "LA rn ia\aia\a :) o o o C\J o o -ct O. H p o Eh o P ^Hl fs •H a> 0) pi t> p CO M-H ■H »H ra (U •H > fn pi -H (U i-q « P ni 3 (D CO « o cti 0) Q) ?^ f> P O -rj cfl H « 13 O O P o to u pJ -H 0) h^ « P CD CO o nj 0) (u ^ > P o H cd H « Is o o c o tn n5 CO O H H \0 vo c^- r— 3 3 C » o o o o O 0\l-P\oo 0\ CM -^sO CfJ '^j &-U H H H o o o o o VO OO C^ CM -d^ 0\_:3-vO OD (?\ C^ Cjg Cu Cj Cg lAITvXALfN'Lrv : II D 3 D o o o o o -:t O <^ rnco 0^ CJwO CX3 oo Oi (7j Cu Wj (^ r-vo i>- i>- c^ 3 3 3 o o o o o CO CM O H -=t f"^ J- C3s O On C»i 0% CTj iTV ''^^ H H H CM H OOOO OOOOO O O O O O H l^- CM CM lA O H O NO -^ ■^-^ Co C^u CT^, ON NO vO ■i-rN-Lf\_:t 3 C OOOOO ^TA CM O O lAIAC^ H CM t?u (Til (7i O^ CX3 CO C^ H D OOOOO <^cO O O -a" 1A (3^ l>-cO OS ^'' Ui *- "TiJ CTj CM CM CM - CM O Ol, (7^ 0(j "^ Gj nOvOC^C^- ^-\Of--f~-C-- COCOC^I>-00 OOOO rvj ■-'^ O H J- c^. HI H OOOOO -ct O ^ o^oo (^ On. NO oo CO OOOOO H OnIACO -d^ O lAH ^OO Oj ir, fj; Oti (^ lA-iJlAOO UA O 3 OOOOO H CM NO NO CNI CO r^ CM i>-cg *j *^ <^ r^ C3NCM H 3 8 3 OOOOO OO NO _;t C3NNO CJN (V- H CM m, '?j - H c^ CM CM o o . H H O^ C-j Wi (Tj nO NO i:^ c^ OOOO OOOOO -J- O c^ r^co or> CNNO CO 00 O O o o o J-IACM O O XA XA O- H CM i>-Nor^r^i>- ooooo-H o OOOO O O H CM nO NO CM CM CM OO 0^ CM C^ CM -CO CJN fA c^ fA fA On CJn On On rA <-i r-\ H. H CM tA J-tA 3 3 On On On On CJn H H H H H O CO .g H O o 05 :d p 0) CO 0) p > o -p 00 - t3 xJ CO OOOOO OOOOO o o cu 0) CAOO OHO CA CJn r^oo \A -^-^ ^ cd lA CA C^ CKIA CM O- H » CM CM CM CM CM ^CM^^^ NO C— ^ Q) ^ H H H H p P •g g XJ 0) p to (D O OOOOO OOOOO O O ^ a fACO O CM NO oo NO -^ OnnO CM r— 'H P Si lA CA l>- I>- CM On c^ H CM fA H r- p>a XJ OS a„ Ci iT^ ■?» Ob (?t ff\ o\ Ofi ^ i>» H 0) CM CNI CM lA fA CM CM ^-:i CM CM CM ■73 CO CO •H •H n •H O P p! t^ c O O OOOOO OOOOO O O (D ^ CJn J- UN fA tACN CJn CM C^ MX) H C^J CM O CM On cfl Q) <0 cTj ffi ^ <\ CK ot CO l>- CJn O CM H H ^^ O pj ^ s NO f- CO CJn O H CM (A^IA NO r~- ,j J- J- J-_=t1A lAXAIAIAlA lAlA cd X3 3:300 3 3 IAnO C^OO CJN O H CM fA_=t XAMD _=^.:d■ J- J'-O- lAXAlAIAlA TAIA On O, CJn On CIN On On CJn On On On CTn H rH ri H H H H H H H H H =23= Export Construction of Hodges Danij San Dieguito Dam, and related structures was canpleted in 1919, at which time export of water through these facilities from the San Dieguito River watershed commenced. The City of San Diego leased these facilities in 1925, prior to purchase in 1939, for the purpose of secur- ing a supplemental water supply o At that time, the City assumed the obligation to furnish from Lake Hodges to the Santa Fe and San Dieguito Irrigation Dis- tricts and the Del Mar Water, Light, and Power Company, now Del Mar Utilities, 6,576 acre-feet, 3ji200 acre-feet, and 72U acre-feet of water per year, respec- tively. In 19U5j) a further agreement between Santa Fe Irrigation District and City of San Diego reduced the obligation to that District from 6, $76 acre-feet per year to ii,300 acre-feet per year, and this agreement is still in effect, D\iring periods of drought, the obligation of the City of San Diego to furnish water to Del Mar Utilities may be reduced by 2$ per cent, at the option of the City, Furthennore, in the event Lake Hodges is depleted, the City may fulfill its obligations by furnishing the aforesaid agencies with Colorado River water discharged into Lake Hodges from the San Diego Aqueduct, Santa Fe and San Dieguito Irrigation Districts and Del Mar Utilities lie wholly or partially outside the San Dieguito River watershed. Therefore, the portion of the afore-mentioned deliveries used outside the watershed con- stitutes an export. Water exported to the City of San Diego from Lake Hodges passes through San Dieguito Reservoir and is conveyed to the Torrey Pines Filtration and Pumping Plant located about 12 miles south of San Dieguito Reservoir, In 195U, Sutherland Dam on Santa Ysatipl Creek was completed by the City of San Diego, and diversion of water through a conduit from Sutherland Reservoir to San Vicente Reservoir on San Vicente Creek, tributary to the San Diego River, was initiated the same year. -2U- Although the San Dieguito Irrigation District^ which lies entirely outside the San Dieguito River watershed^ and the Santa Fe Irrigation District are member agencies of the San Diego County Water Authority j, they are without direct pipe line connections to the San Diego Aqueduct » Through an agreement with the Ci-ty of San Diego ^ Colorado River water purchased by the two irriga- tion districts is released from the aqueduct and passed through Lake Hodges and San Dieguito Reservoir before distribution within the service areas, A portion of the Colorado River water used within the City of San Diego is also released from the aqueduct above Hodges Dam smd passes through Lake Hodges and San Dieguito Reservoir to the previously mentioned Torrey Pines Filtration and Pumping Plant, Estimated seasonal exports of local, San Luis Rey River, and Colorado River water from San Dieguito River watershed are presented in Table 5 and Appendix E. Ground Water Hydrology Valley areas with a capability for the subsurface storage of water comprise less than 10 per cent of the San Dieguito River watershed. The most productive areas are the alluvivmi-filled San Pasqual and San Dieguito Basins, Water is also extracted, to some extent, by wells located in less permeable formations underlying hilly areas. Over 750 wells were visited during the investigation. For these wells, available drillsrs' logs were collected and information as to pumping plant equipment, diameter and depth of casing, use and age of well, and owner- ship was recorded. The location of wells is shown on Plate U, A program of semiannual measurement of the depth to ground water -25= in over IjOO wells j was established in the fall of 19$6 in San Pasqual, San Dieguito, and Ramona Basins, About 7U wells in San Pasqual and San Dieguito Basins were measured on a monthly basiSj and six automatic gro\ind water level recorders were installedo Records of monthly measurements of depth to ground water in approximately 6k wells in San Pasqual Basin were secured from the City of San DiegOo Ground water samples were collected from selected wells within the watershed and analyzed to determine concentrations of mineral constituents, Basic data concerning depth to ground water are not presented in this report. Available ground water level data for the fall of 1956 and spring of 1957 for San Dieguito River watershed are published in State De- partment of Water Resources Bulletin No« 39'"57.o "Water Supply Conditions in Southern California During 1956-57" j dated June, 1958, Records for each year subsequent to the spring of 1957 will be published in succeeding annual reports in the same series. Records of groxmd water levels prior to the fall of 1956 may be inspected at the Southern California District office of the Department of Water Resources and, after collation and analysis, will be published in a forthcoming annual volume of Bulletin No, 39 « Geologic Considerations Rocks exposed in the San Dieguito River watershed range in age from Triassic to Recent and may be divided broadly into basement complex and younger sedimentary formations » Basement complex consists of raetasediments of Triassic age| intrusive^ extrusive, metamorphic, and granitic rocks of Jurassic age| and granitic rocks of Cretaceous age. The sediments, which overlie the basement complex, from the ocean to about 9 miles inland include marine and nonmarine sediments of Eocene age and alluvium of Recent age. „26^- The granitic and metamorphic rock has been weathered in many areas to form up to 100 feet of residuum,, Because of its relatively high permeability and porosity _, the alluvium is the principal water-bearing deposit. In some areas j, however, the alluvium is thin and lies above the ground water surface » Domestic and limited amounts of irrigation water are secured from wells in the residuum and from deep wells in areas where the granitic bedrock is sufficiently fractured to contain ground water in recoverable amounts » Eocene sediments generally yield only limited quantities of water to wells. The basement complex is essentially a fault block which has been tilted westward. The Elsinore fault system extends through the eastern end of the watershed. Available evidence indicates that only the Tonescal fault near Ramona affects the movement of gro\ind water. Eocene sediments near the coast have been gently folded and contain minor faults, but their effects on ground water are unknown. Table B-1 of Appendix B, presents the stratigraphic column of the San Dieguito River watershed and shows the general character of the rocks, Areal geology and general water-bearing characteristics of the rocks in the watershed are shown on Plate $, Geologic sections for San Dieguito Basin are shown on Plate 6-A and sections for Ramona, San Pasqual, and Lake Hodges Basins are presented on Plate 6-B. Ground Water Basins Of the 20 ground water basins in San Dieguito River watershed, San Pasqual, San Dieguito, Ramona, Felicita, and Lake Hodges Basins are the principal ground water bodies from the standpoint of areal extent, available -27- storage capacity, and use. These basins are discussed hereinafter in the order of importance. Location of the ground water basins in the watershed ajid their general water-bearing characteristics are shown on Plate U, and a description of the basins is contained in Appendix B. Data pertaining to the five principal ground water basins are pre- sented in Table 6« -28- so 3 to ■< m a. M U z CL. OS o •a: ■aS 6- c •S'' c B iH OS a c to » +> ft- 1 ° » m w t. ^ '-' M o 'tH rH 8 xi ■P €> k$ § =» 0- & ■«! •Vp a. O •o o o e ^£ V •H no •H t <■) X> (4 O O e d b »< 3 o +> 3 -p a n o u s •rt g *H O •P i. £4 o +> Kt <« * 8? « i» 3 00 ,o i i. +> h •p a 00 1 *•. s « « o verag urfao evati c« ■H e Ci ■ai n iH 9 • • «0 a Is 00 ffi §& ^ 0) w •p •H g c o ■H w4 1 It i. "O §> i (. ■o >> X o *>^ 00 «^ VD o o o o Its 3 o o s o I o m B » 3 o o o o M > tJ 3 -H iH to r-t <■> o o o o o o •s ^ w »H O » t. a ■ T3 t. rH O O Oj O 3 d O 01 S ti> O o J3- 1^ > b ■H U t. cS a .h"« ^ 0) a) (» ■p m X3 -H b ^ •H b CO d 9 1 o O •0 ■p •H 9 ^4^x Q d CO M J m § g w » o\ c>^ 00 p\ c^ VD 09 9 4> b Jj 9 »H O 9 b So n b 9 9 u -H ■H rH ^ -O ca d d b e^ "^ d c c c m d o d 3 05 cS til J 9 CO -29- San Pasqual Basin o San Pasqual Basin, located southeast of the City of Escondido, has a stirface area of 3)h30 acres. It is the most productive ground water basin in San Dieguito River watershed, with an esti- mated usable storage capacity of about 37,000 acre-feet. The basin fill consists of a maximum of 2)00 feet of alluvium, bounded and underlain by crystalline rock. The major recharge to San Pasqual Basin is from the percolation of stream flow iii Santa Isabel Creek, Santa Maria Creek, Guejito Creek, and Bach Creek. The estimated maximum seasonal percolation from rvmoff in San Pasqual Basin, during the period 191U-15 through 1956-57, occurred in 19h8-U9 and amounted to approximately 5,800 acre-feet. Maximum monthly per- colation during this period occurred in February, 1936, and was estimated to be 2,14.00 acre-feet. Discharge from the basin occurs as subsurface outflow, as effluent flow at the lower end of the basin during years of high ground water levels, and as pumping from approximately 100 active wells. Many wells yielding as much as 1,700 gallons per minute are located in San Pasqual Basin. Ground water movement occurs in a general westerly direction, ap- proximately parallel to the direction of surface flow. Lines of equal ele- vation and profiles of ground water levels for the spring of 1952 and the fall of 1957 are shown on Plate 7-A. Since ground water in San Pasqual Basin is unconfined, ground water levels within the basin are responsive to significant changes in the quantity of precipitation on, and runoff passing through, the area overlying the basin. Lines of equal change of elevation of ground water in San Pasqual Basin from the spring of 1952, when the basin was considered essentially full, to the fall of 1957, when ground water levels were the lowest of record, are shown on Plate 8, -30- Long-term records of depth to ground water are available for sever- al wells in San Pasqual Basin „ Fluctuation of water levels in these wells is shown on Plate 9o Records of depths to ground water in the basin indicate that water levels declined consistently during the drought which occvirred subsequent to 19h3-hh'> The basin recovered to an essentially full status as a result of the above-normal recharge occurring in 1951-52 <, During the years following 1951-52, the rate of decline of ground water levels was the greatest of record 5 dropping as much as nine feet per year in well No„ 12S/1W-36D1, as shovm on Plate 9, In the fall of 1957., the estimated average depth to groimd water for the entire basin was about 30 feeto The greatest fluctuation of water levels occurs in the eastern portion of San Pasqual Basinj where the greatest recharge occurs and pumping from wells is appreciable in amount o This phenomenon is demonstrated diagrammatically on Plate 7-A where ground water level profiles are illustratedo San Dieguito Basin . San Dieguito River traverses San Dieguito Basin and is the main source of recharge to this coastal ground water basin. Wells used primarily for agricultural purposes, in addition to subsurface outflow to the ocean during periods when ground water levels are above sea levelj constitute the principal means of discharge from the ground water bodyo Historically, ground water has moved in a general westerly direc« tion toward the ocean. During the recent drought, however, pumping depres- sions where ground water levels are below sea level have been formed in inland locations and a landward hydraiilic gradient has been established, as shown on Plate 7-B. San Dieguito Basin is a partially confined grotind water reservoir -31- at its westerly end and has a limited recharge area. Consequently, ground water levels within the basin are not as responsive to changes in quantity of precipitation and runoff as are water levels in San Pasqual Basin. Long term records of depth to ground water are not available for San Dieguito Basin. Records of water level fluctuations during the past several years in- dicate that a marked decline has taken place in water levels. In the central portion of the basin levels have dropped as much as six feet per year. Ground water elevations in the fall of 19$7 in San Dieguito Basin are generally be- lieved to be the lowest of record. Water levels in the fall of 1957 were below sea level at a point five miles inland from the coast and were nearly kO feet below sea level at a point 3.8 miles inland from the coast. An analysis of records of ground water level fluctuations in the coastal portion of San Dieguito Basin indicates that tidal fluctuations af- fect water level elevations in wells in this region. Correlation between the regimen of high and low tides and water levels in well No. li^S/UW-lQl, lo- cated less than two miles from the coast line, is shown on Plate 9. This relationship indicates either that the water-bearing formation underlying the basin is in hydraulic continuity with the ocean, or that tidal fluctua- tions are affecting the hydraulic pressure head on the portion of the partially confined aquifer which extends beneath the ocean, or that a com- bination of both of these phenomena is occurring. Ramona Basin . Recharge to Ramona Basin in Santa Maria Valley occurs as percolation into the shallow Recent alluvium found along Santa Maria Creek and into the residuian which comprises most of the basin. Discharge from Raroona Basin occurs as pumping from numerous domestic Mad agricultural wells which, for the most part, yield small quantities of watero The ground water surface slopes in a westerly direction similar to the slope of the ground STirface. Elevation of water levels and direction of -32. ground water movement in Ramona Basin for the fall of 19^7 is depicted on Plate 7"C„ Although little Recent alluvium exists in Ramona Basin, ground water levels in most areas of the basin are very responsive to significant changes in magnitude of precipitation and runoff because of the permeable nature of the residuum o Ground water levels approximately one mile north- east of the community of Ramona rose over 20 feet in the spring of 1952 as a result of above-normal precipitation and runoff o Water levels in the basin have declined rapidly during the drought which has occurred since that time-, dropping as much as five feet per year in some areas., as shown on Plate 9o Ground water level elevations in the fall of 1957 in Ramona Basin were generally the lowest of recordo Felicita Basin g Felicita Basin, located in the hilly area be- tween Lake Hodges and the boundary of the San Dieguito River watershed south of the City of EscondidOj, consists of relatively shallow residuumo In addition to percolation of precipitation below the root zone, recharge to Felicita Basin is derived from applied water^ most of which is imported into San Dieguito River watershed through facilities of the City of Escon- didoj Rincon del Diablo Municipal Water District, and Escondido MutusuL Water Companyo By far the largest proportion of this imported water is Colorado River or San Luis Rey River water^ as previously discussedo Effluent flow occurs from Felicita Basin and is evident in small unnamed intermittent and perennial watercourses which extend in a southerly direction into Lake Hodges Basin. The major source of discharge from the basin is extraction of water from wells, Mar^r of these are uncased in- stallations with horizontal laterals 5 producing moderate quantities of water for beneficial use. Ground water moves in a southerly direction toward Lake Hodges » -33- The direction of movement is indicated on Plate 7-D, showing lines of equal elevation of ground water levels for Felicita Basin for the fall of 1957. Lake Hodges Basin . Lake Hodges Basin lies south of the City of Escondido and Felicita Basin and lies north and east of Lake Hodges. Recent alluviuni overlies the residuim within Lake Hodges Basin. Re- charge to ground water occurs principally from surface and subsurface flow from San Pasqual and Felicita Basins. Lake Hodges Basin is, at times of high reservoir stages, replenished, in part, by percolation of water stored in Lake Hodges j however, subsurface flow from the basin usually moves toward the reservoir. The principal discharge from Lake Hodges Basin is pumpage through wells of the Green Mutual Water Company of San Diego. County. This company sup- plies water for irrigation of avocado and citrus groves and for domestic use on the hilly areas bordering Lake Hodges Basin on the west, north, and east. Long-term records of ground water level fluctuations in Hodges Basin are not available, but movement of ground water and elevation of ground water levels within the area for the fall of 1957 are shown on Plate 7-D. Quality of Water A study of the mineral quality of waters within the San Dieguito River watershed was undertaken to determine the suitability of these waters for irrigation, domestic, and municipal use and to detect the occurrence of any mineral quality impairment. The data used in this study included 139 complete and 7 partial analyses of ground water and 32 complete and 8 partial analyses of surface water. These included a large number of samples taken and analyzed by the State Department of Water Resources. The remainder of the analyses used have been obtained from cooperating agencies . -31;- The evaluation of present water quality is based primarily upon 73 complete analyses of ground water^ and 7 complete analyses of surface waterj from samples collected early in 1957. Complete mineral analyses include the determination of the concentra- tion of four cations: calcium (Ca)j magnesium (Mg)s soditm (Na), and potas- sium (K); five anions j carbonate (COo), bicarbonate (HCO^)^ chloride (CI), sulfate (SOk), and nitrate (NO-j); total dissolved solids j boron (B); fluoride (F)5 and computed values of per cent sodium and total hardness. In generals ^o^ purposes of this investigation, the partial analyses include determinations of chloride and bicarbonate ion concentrations, electrical conductivity, and total hardness. Specific terms as used in succeeding water quality discussions are listed and defined as follows r Quality of Water . Those physical and mineral characteristics of water affecting its suitability for beneficial uses. Degradation . Any impairment of the quality of water due to causes other than disposal of sewage and industrial wastes. Pollution . Impairment of the quality of water by sewage and indus- trial waste to a degree which does not create an actual hazard to public health, but which adversely and unreasonably affects such water for beneficial uses. Contamination . Impairment of the quality of water by sewage or industrial wastes to a degree which creates a hazard to public health through poisoning or spread of disease. Hardness . A characteristic of water which causes coagulation and in- creased consumption of soap, deposition of scale on boilers, injurious effects in some industrial processes, and, on occasion, objectionable taste. Hardness is due in large part to the presence of salts of calcium, magnesium, and iron. Character of Water . The predominant cation and anion identify the character of water. For example, water which is sodium bicarbonate (NaHC03) in -35- character contains sodium and bicarbonate ions in excess of 50 per cent of the total cations and anions expressed as equivalents. Standards of Quality for Water Investigation of the quality of surface and ground waters of the San Dieguito River watershed, as reported herein, is limited to the consideration of the mineral constituents of the waters, with reference to their suitability for irrigation and domestic xise. The factors t^ ich were used as a guide in determining siiitability of water for irrigation use comprise the following: (l) chloride concen- trationj (2) total dissolved solids, as measured by electrical conductance; (3) boron concentrationj and (U) per cent sodium. The significance of these factors is as follows: 1. The chloride ion is found in varying concentrations in irriga- tion waters. It is not considered essential to plant growth, and excessive concentrations will inhibit growth. 2. The amount of total dissolved solids, as indicated by electrical conductivity (ECxlO" at 25°C), furnishes an approximate indication of the over-all mineral quality of the water. For most natural waters, total dissolved solids in parts per million (ppm) are approximately equal to 0.7 of the electrical conductivity. The presence of excessive amounts of total dissolved solids in irrigation water will reduce crop yields. 3. Crops are sensitive to boron concentration, although they generally require a small amount (less than 0.1 ppm) for growth. Most plants will not tolerate more than 0.5 to 2 ppm of this element. h» Per cent sodium reported in the analyses is the ratio of the sodium cation to the sum of all cations and has been obtained by dividing sodium by the sum of calcium, magnesium, potassium, and sodium, all expressed -36- in equivalents per million (epm), and multiplying by 100„ Water containing high per cent sodium has an adverse effect upon the physical structure of the soil by dispersing the soil colloids and making the soil "tight", thus retarding movement of water through the soilj retarding the leaching of salts, and making the soil difficult to worko This Department uses a classificationj based on these four factors, which separates water to be used for irrigation purposes into three general types. This classification is presented in the following paragraphs, taken from "California Agriculture", October, 1950„ "Because of diverse climatological conditions, crops ^ and soils in California, it has not been possible to establish rigid limits for all conditions involved. Instead, irrigation waters are divided into three broad classes based upon work done at the University of California and at the Rubidoiix and Regional Sal- inity Laboratories of the U, S„ Department of Agriculture, "Class 1, Excellent to good - Regarded as safe and suitable for most plants under any condition of soil or climate, "Class 2« Good to injurious - Regarded as possibly harmful for certain crops under certain conditions of soil or climate, particularly in the higher ranges of this class, "Class 3, Injurious to unsatisfactory - Regarded as probably harmful to most crops and unsatisfactory for all but the most tolerant," Tentative standards for irrigation waters have taken into account four factors or constituents, as listed below: Class 1 excellent to good Class 2 good to injurious Conductance (ECxlO^ Less than 1,000 1,000 - 3,000 at 25°C) Boron, ppm Less than 0,5 Oo5 - 2,0 Per cent sodium Less than 60 60 - 75 Chloride, ppm Less than 175 175 - 350 Class 3 injurious to unsatisfactory More than 3,000 More than 2.0 More than 75 More than 350 "37- Probably the most widely used criteria for determining the suita- bility of water for domestic and municipal use are the "United States Public Health Service Drinking Water Standards, 19h6", which have been adopted by the State Department of Public Health. These standards establish mandatory limits for certain constituents and recommended limits for others. The man- datory limits, in ppm, are as follows; Lead 0.1 Fluoride 1.5 Arsenic 0.05 Selenium 0.05 Hexavalent chromium 0,05 latory but recommended limits. in ppm Copper 3.0 Iron and manganese together 0.3 Magnesium 125 2inc 15 Chloride 250 Sulfate 250 Phenolic compounds in terms of phenol 0.001 Total dissolved solids, desirable 500 Total dissolved solids, permitted 1,000 Total hardness is a significant factor in the determination of the siiitability of a water for domestic and municipal use. Waters containing 100 ppm or less of hardness (as CaC03) are considered as "soft", 101-200 ppm "moderately hard", and those with more than 200 ppm "very hard". In addition to the above quoted standards, the State Department of Public Health has recommended a tentative limit of 10 ppm nitrate nitrogen as N (kh ppm nitrate as NOo) for domestic waters. Any water containing higher nitrate concentrations may be considered to be of questionable quality for domestic and municipal use. It shovild be noted that no bacterial analyses have been made, and discussion of suitability of waters for domestic and municipal purposes -38- is limited to considerations of mineral quality. Quality of Surface Water Surface water analyses are available from l5 sampling points dis- tributed throughout the San Dieguito River watershed. These analyses are contained in Table F-1 of Appendix F. Typical analyses of surface waters are presented in Table 7? and the locations of the sampling points are shown on Plate U. The stream mile sampling point numbers shown in Table 7 indicate the stream, tributary, and location of the sampling point. The first number denotes the major stream system, and the last number represents the number of miles upstream on an individual tributary. Intermediate numbers are mileages to successive stream confluences. For example, niimber 96-26.0-2.0 refers to a sampling point on a tributary of San Dieguito River which has its confluence located 26.0 miles upstream from the ocean, i.e,, Guejito Creek, The sampling point is 2.0 miles up Guejito Creek from the confluence. -39- 9 O 5 :3 •P S!5:2 0. o •• o« .•• •• •« a 4 s 9 o n •< a u c M «H :;^fs « a > «4 B ^^^■Ss •- .. S S T; "1 1 «r5& o. h •H S. o. • « •« «• •» «s t^ o z g ft •vt >-< •H OO OS ««• s. W , ' ^ S W ■f <^ (. e o • e o o 1 B ■ Bu •• i ! O C3 5 M a *> B e* •• • 9 :! ■»» 2 •« •« O #-t S ol b • am •• ^ « o =a. • • D* 04 •« ,. •H 4> O K rt UN a ~ t\ « x) o _^ m .f« lila a)!^ Qje- 9.1^ • <^ r$ a l^|a •••••••• •• ^ 5|g| •h .. « s e 9 ^ • -a '«* ^^1 HI 1 s> OO o OO CM o o ^ OO s o o o o ^0 Io o s r-llesi olcsl \^|o • o • CO o s d5 s «M IS col* 1^ n^ o M 5^ »npl OO • OO • ^ I ^ I o I 74 &V ■1 1 I ^ S^ Ol o OO CN O ^b NO NO M I -JR o OO OO o olo ION B 4 ■ •< C • -«• CD 3 t, a 9 M u c/i od o e OO C4 I a I O J4 • ■^ TS ••* • d 4> »* • 5 Tl ca (a • s J? -g^ g ■a o ? X o S S 5 v « S o »< & b 8 § ^^ +» ••» ») c o 1: 'H W "O I M o m • • I* t s o to • rJ ^ at Q O ^8 55 S O -P r4 *t w4 •a n « n a ^1 4 .o o -o .W An evaluation of these analyses shows the waters of the Inland Hydrologic Unit to be of good mineral quality., The mineral character of these waters is variable, but generally bicarbonate and chloride ions are the dominant anions „ No cation appears to be dominant in these waters. The total dissolved solids content is indicated by the analyses to be generally less than 600 ppm and chloride content less than lIiO pprn., The sodium percentage is less than U5o These waters are considered to be in Class 1 for irrigation use and are well within the limits for recommended drinking water standaivls. The runoff from the Inland Hydrologic Unit is tributary to Sutherland Reservoir in the Inland Unit and Lake Hodges in the Central Hydrologic Unit, The quality of the water in Sutherland Reservoir has re- flected the good quality of the supply from the Inland Unit, During periods of above-average runoff, the quality of water in Hodges Reservoir should approach that of the inflow from the Inland Hydrologic Unit. Since No- vember, 19i;8, Colorado River water has been stored in this reservoir. During drought periods, the reservoir contains a large percentage of this imported water and its quality approaches that of Colorado River water. This water is sodium-calciTjm sulfate in character. Its electrical con- ductivity exceeds a value of 1,000 and it is considered to be in Class 2 for irrigation water supplies. This water is usable for domestic use although its sulfate content exceeds recommended non-roandatory drinking water standards. Throughout the Coastal Hydrologic Unit, surface waters are usually of good quality except in the coastal fringe areas vrfiere saline tidal sloughs are found. =U1- Qugtlity of Ground Water Ground water basins in the eastern portion of the San Dieguito River watershed receive water from direct precipitation and runoff from adjacent highlands. These sources are generally of excellent mineral quality. As the basins are not extensively developed, there is little re-use of water or resultant salt build-up in the ground water and ground water quality is gener- ally good. All available ground water analyses are included in Table F-2 of Appendix F. From these analyses, a group considered to be typical have been selected and are shown in Table 8. The location of the wells from which representative samples were collected is shown on Plate h» The ground water quality in each of the hydrologic units of the San Dieguito River watershed is presented hereinafter. -Il2- 8- <5» ^ • G t» a, 9 z 31 b "O ai o o o IS o ^ rt 3 q 5 t*4 H o M g CO S ^ ^ a c a m -rt o. o -g Ei o. J* o 5> UN 5? ON & J5? oo 2> ^ NO UN O ^ » UN o c « s ■»» 5 a o CO o o o o M ^ o ^, -I o o OS CM) -a c^ <* O M do O lifN S «! C HI , to t I •OS w UN <»N O I C4 H 5a ^1 ^ ,!^ J? J' J o oo PijcA & s NO fi^ fe ^ Jn 1 A J A er\ (-1 p-1 ^ S3 §3^ i 4 ^ \ V. \ ^ PN ?^ o o 6- o I' o lu\ M2 u^o d f- 1-° UN ■3k NO NO o o o o fe cJs •y o r! c ol a o i, « • •> 8 a S5 « tt # ■ s i n ■r-l O -P <0 hri IK (d g<2-^ 0)1 a; CO (1) t— •rl > U\ iJ « VO g !>so\ CO 0) H •^ O o U (U o K •o •« 0* ^■1 to cd (I) Td -d U m |§§ •d to -rt tg-^ !§- OJ O O O O O o H I O o H H I o o o H O O O o o o o o o CVJd) « ITvt^ H (M g^ 8 ^ ^ H O MD "N •> •\ <> J- C- ^ u\ o o o o oD ^- tr\ m Pot— , o> «N CVJ OJ oo o ro O en t-^ o o 00 CO 1 O O o o o H O O H Ht- o o o o ol 1 + -d p -d o of O o CM OJ OJ OJ Al OJ •* •s •» CM OJ OJ 1 + o o o P o ^ oo t~ CM CM CM ^ O •v <> •s •\ J- H Lf\ OJ I •p to (d o o o o ON o CVJ o 00 o CO CJ\ •s LfN I o o CM CO 5 C7\ CQ ft fS^ O to -d -p I -H -3 u p K CO C3N (U -d aJ ftO ^ ^ o "d •52- Surface Water Developments Construction of the concrete m-ultiple-arch Hodges Dam, located on the San Dieguito River about 12 miles upstream from the ocean,, was completed in 1919 o Extensive reconstruction was undertaken by the City of San Diego in 1936 to strengthen the structure. The storage capacity of Hodges Reservoir, originally 37j,700-acre-feet, has been reduced to approximately 33>500 acre-feet as a result of sedimentation. Releases from Hodges Reservoir are conveyed approximately five miles westerly to San Dieguito Reservoir, located on a minor tributary of Escondido Creek. From this City of San Diego reservoir, having a capacity of 1,100 acre-feet, water is delivered to the City of San DiegOs San Dieguito and Santa Fe Irrigation Districts^, and Del Mar Utilities . Construction of Sutherland Dam on Santa Ysabel Creek, about six miles northeast of Ramona, was started by the City of San Diego in 1927, but was not completed until 19^h« Sutherland Dam, a concrete multiple-arch structure, provides a reservoir with a gross storage capacity of approxi- mately 29,700 acre-feet. Water diverted from Sutherland Reservoir is transported to the 90,200 acre-foot capacity San Vicente Reservoir on San Vicente Creek, tributary to the San Diego River. San Vicente Reservoir is owned by the City of San Diego and is the terminus of the existing San Diego Aqueduct. From San Vicente Reservoir, water may be conveyed to the City-owned El Capitan Reservoir on the San Diego River, when there is a stiff icient differential in reservoir levels, or discharged directly into the City's distribution system. Yields from Hodges and Sutherland Reservoirs for the period 19lU"l5 through 1956=57 under coordinate reservoir operation, assuming present condi- tions of land and water use in San Pasqual-Main Lake Hodges Basin, are pre- sented in Table 9. Location of these reservoirs is shown on Plate 1. -53- Intermittent diversions from Santa Isabel Creek in the eastern and western portions of San Pasqual Valley by individuals and private water companies have occiorred for many years. The only records available of these diversions, which are generally small in magnitude, are measurements of flow in East and West San Pasqual Ditches before 1916, Import For the purpose of estimating the yield from the presently de- veloped water supply within San Dieguito River watershed, the imported supply available from the San Diego County Water Authority is asstimed to be equal to the 19^6-^7 proportional rights of the member agencies of the Authority within the watershed to waters of the existing San Diego Aqueduct and the first barrel of the Second San Diego Aqueduct, now under construc- tion, f\irther proportioned by the present water use inside and outside the watershed. The presently developed imported supply from San Luis Rey River is assumed to be equal to the 1956-$7 import from this source. Estimated values of present yields from ground water supplies, safe yields from Hodges and Sutherland Reservoirs, and yield from the presently developed imported supplies are presented in Table 9, -5U- CHAPTER IIIo WATER UTILIZATION AND REQUIREIvlENTS The historical use of -water in San Dieguito River watershed has been discussed in Bulletin Noo $$c The present use of water in the watershed is chiefly for agricultural purposes « This demand is satisfied principally from imports and withdrawals from ground water storage and^ to a lesser extent 5 by diversion from surface streams « On the whole 5 acreage devoted to irrigated agriculture in the watershed has increased during the last several decades » A decrease has occurred in Santa Maria Valley diuring recent years as a result of the severe drought and the absence of imported supplies » Decreases have also occurred within Santa Fe Irrigation District as a result of an increase in urban and suburban useo An increase in the latter type of use has occurred in San Dieguito River watershed in recent years ^ reflecting the general increase in population and the consequent urban and suburban development that has occurred at a remarkable rate in San Diego County since about 19l;0o As local water resources are developed and additional imported supplies are made available in the future, it is estimated that both irrigated acreage and areas devoted to urban and suburban use will increase in the watershed. Water utilization and requirements are discussed in this chapter under the general headings; "Ground Water Extractions''^ "Appropriation of Water", "Land Use", "Unit Use of Water", "Factors of Water Demand", "Water Requirements Within San Dieguito River Watershed", "Supplemental Water Requirements Within San Dieguito River Watershed", "Water Requirements of the City of San Diego", and "Supplemental Water Requirements of the City of San Diego", "55" Ground Water Extractions It is estimated that there are about 1,000 wells in San Dieguito Hirer watershed, of irtiich 750 were examined in the field. Of the active wells in the watershed, it is estimated that approximately 285 wells supply water to meet irrigation requirements, 285 wells are used for do- mestic purposes, and approximately 30 wells supply water for stock. Estimated number of active wells, their use, and magnitude of ground water withdrawals, based on consumptive use and an assumed irriga- tion efficiency of 70 per cent, for each of the gro\md water basins in the watershed, are presented in Table 10. -56- TABLE 10 KRJMBER OF ACTi^'E WELIS AM) SIOUM) WATER EXTRACTIONS FROM BASIIMS IN SAH DIEGUITO RHER WATERSHED Number of active weils locat-ed Ground water ■baRin ; Irriga° iDomestic s Stock ;ion .a Inland Unit Ballena East Guejito West Guejito Upper Hatfield Lower Hatfield Pamo Ramona^ East Santa Teresa West San.ta Teresa Santa YsaTr-el Wash Hollow Subtotals Central Unit Feiicita Green Hidden Highland Lake Kodges Reed San Pasqual Subtotals Coastal Unit La Jolla San Dieguito Subtotals TOTALS 5 hi 2 1 1 1 58 100 3 k 1 20 1 Jl 196 1 _28 29 283 8 1 1 k l4l 3 „™ 166 50 2 12 95 5 2U 285 1 11 2 3 19 1 2 i: 7 1 1 27 Total 11 1 1 10 199 7 1 10 _j 243 150 k 3 31+ 1 102 298 6 595 t Estimated _s ground water s extractions in s 1956=57p in acre^feet 50 10^ 290 130 2,510 50 10 30. 3,080 8,130 b 2,310 2,510 13,720 ao Approximately 0.7 per cent of basin lies within Central Unit. There is no known use of ground water in this portion of the basin. bo Pumpage estimated to be less than 10 acre-feet. '57= Appropriation of Water Since the effective date of the Water Commission Act of December 19, 1914, 38 applications to appropriate water from streams in the San Dieguito River vratershed have been filed with the State Water Rights Board or its predecessors. Applications filed through January 1, 1958, are listed in Appendix G, together with pertinent data on the status of the applications, and location and amount of the diversions. The applications, permits, and licenses listed in Appendix G for the appropriation of water do not include appropriative rights initiated prior to the Water Commission Act, riparian rights, correlative rights of overlying owners in ground water basins, nor prescriptive rights which may have been established on either surface streams or underground basins. In general, a comprehensive definition of all rights to a particular water source may only be established by court decree. Significant to the further development of the water supply within San Dieguito River watershed are the following applications by the City of San Diego to appropriate water: Application Date Number Filed Source 2315 4-20-21 San Dieguito River 11658 12-12-46 Santa Ysabel Creek 11658 12-12-46 Santa Ysabel Creek 1L658 12-12-46 San Dieguito River Approximate locatiom of point of diversion HODGHS Oah Sutherland Dam PAMO Dam Site Hodges Dam Amount OF PERMIT Purpose Status 37,700 AF Municipal Certificate 50 CFS Municipal Permit AND SOjOOO AF .130,000 AF Municipal Permit 230,000 AF Municipal Permit Water Rights Litigation In May, 1956, certain landowners in San Pasqual Valley brought suit against the City of San Diego, in the Superior Court of the State of California in and for the County of San Diego, over operation of the City's Sutherland -58- Reservoir located upstream from San Pasqual Valley on Santa Isabel Creek „ The actions entitled Stanley Truss el l ^ et al,j plaintiffs j, vso The City of San Diego ^ a Municipal Corporation ^ defendant, went to trial in October, 1957p and judgment was entered December 17, 1957,1 in favor of the plaintiff So The City of San Diego filed an appeal in March , 19$8j before the Fourth District Court of Appeals., and hearings are tentatively scheduled to be held in 1959. The trial court declared in its judgment that the plaintiffs are owners of rights in and to the waters of Santa Ysabel Creek which are prior and paramount to the appropriative rights of the defendant, the City of San Diego, and are entitled to have sufficient amounts of both surface and subsurface flow of Santa Ysabel Creek available to meet their reasonable requirements for beneficial iise on their lands within the watershed without interference or interruption by the defendant. The Court further ruled that the plaintiffs are not obliged to change their long-established methods of diversion and use of waters of Santa Isabel Creek and are en- titled to have the normal static grouoid water level underlying their lands remain as it would have been if Sutherland Dam had not been built o The Court enjoined the City of San Diego from storing or withholding any of the natural flow of Santa Isabel Creek upstream from the plaintiff s lands when= ever the static water level underlying said lands is 20 feet or more below the surrounding gro\ind surface. The City of San Diego has reported that the judgment of the trial coxirt seriously restricts their use of Sutherland Reservoir and that the City plans to acquire the remaining privately-owned land in San Pasqual Val- ley through negotiation or condemnation proceedings if the decision of the trial court is not reversed upon appeal. Therefore, it was assumed in the operation studies and cost analyses described herein that the City of San Diego would have the right to unrestricted use of Sutherland Reservoir„ -59- The Findings of Fact, Conclusions of Law, and the Judgment of the Court appear in Appendix G to this report. Land Use For the purpose of estimating water requirements of San Dieguito River watershed, present land use within the watershed was determined in December, 1956, and January, 1957 « Lands devoted to truck crops were sur- veyed quarterly in 1957 in order to determine average areas devoted to such use- The findings of these surveys is assumed to represent actual land use as of the 1956-57 season. In addition to the determination of present utilization, lands within the watershed were classified in the field as to their suitability for irrigated agriculture and for potential urban and sub\irban use in order to estimate probable ultimate water requirements. Past and Present Land Use In 1888, of the total 220,760 acres within the watershed, there were, reportedly, 175 acres ©f irrigated agriculture in San Pasqual Valley, 100 acres irrigated in San Dieguito Valley, an additional 100 acres under irrigation in Santa Isabel Valley, and 25 acres irrigated along Guejito Creek, for a total of about UOO acres \inder irrigation in the watershed. The total area irrigated in 1931; was approximately 14,500 acres, increasing to 7,300 acres in 19U8 and 9,600 acres under present conditions. Approxi- mately 70,000 acres within the watershed are now devoted to nonirrigated agricultural enterprises. -60- A marked increase in urban development, coupled with an increase in populationj, has occurred in recent years near Del Mar in the vicinity of Uo S, Highway Noo 101 and the San Diego Coiinty Fair Grounds . The City of Escondido and the community of Ramona have also experienced urban and subvir- ban expansion. About 2,600 acres 5 or 1„2 per cent of the watershed area, are presently classed as urban and suburban lands. The population of San Diego County, City of San Diego, and City of Escondido for census years and the year 1957, commencing in 1900, is as follows t Population San Diego Year County 1900 35,090 1910 61,665 1920 112,218 1930 209,659 19U0 289,3U8 1950 556,808 1957 900, UOO^ ao Estimate. b. Special census. City of San Diego 17,700 39,578 7ii,36l 1U7,995 203,3U1 33ii,387 U9ii,200a City of Escondido 755 1,33U IJ89 U,560 6,514;, 10,050° The land use survey of the watershed in 1956 and 1957 by the State Department of Water Resources was undertaken as part of the continuing basic data collection program of this Department. A summary of the results of these surveys is given in Table 11 for San Pasqual and San Dieguito Basins and for the entire watershed, and are assumed to represent present conditions. Use of lands within hydrologic units and subunits for 1956-57 is presented in Table H-1 of Appendix H to this report. -61- TABLE 11 LAND USE IN SAN PASQUAL AND SAN DIEGUITO BASINS AND SAN DIEGUITO RIVER WATERSHED FOR 1956-57 In Acres Class and type of land use ' San Pasqual |San Dieguito ' Basin ' Basin San Dieguito River ■watershed URBAN AND SUBURBAN LANDS Residential Commercial Industrial Parks and cemeteries Miscellaneous urban and suburban Vacant Net urban and suburban area Streets and roads Gross urban and suburban area 7 U86 lii8 296 70 151; 26 7U 32 92U 18 163 7h 275 2,OU9 8 112 503 62 387 2,552 IRRIGATED UNDS Alfalfa and pasture 828 362 2,363 Avocados 1 2,318 Beans 612 612 Citrus 38 1 2,859 Deciduous and vineyard 3 6 108 Hay and grain 183 218 582 Truck crops U9 80 301 Net irrigated area 1,101 1,280 9,lli3 Streets and roads 58 67 U78 Gross irrigated area 1,159 l,3k7 9,621 GROSS WATER SERVICE AREAS l,2lil 1,731+ 12,173 -62- LAW USE IN SAN PASQUAL AND SAN DIEGUITO BASINS AND SAN DIEGUITO RIVER Y/ATERSHED FOR 1956-57 (continued) In Acres Class and type of land use , s„ ^. ,^ sSan Dieguito San Pasqual „San Dieguito , River Basin ; Basin I ^^tershed NONIRRIGATED AGRICULTURAL UffflS Field crops Pasture and grain Orchard and vineyard Idle and fallow Miscellaneous Net nonirrigated agricult-ural area Streets and roads Gross nonirrigated agricul- tural area 1,001 522 255 361 825 26 255 51,153 1.9 3li4 13,23li 613 1,523 1,U67 66,569 81 76 3,Ii96 lo60ii l,51i3 70,065 NATIVE VEGETATION Light brush and grass lands Mediiim brush Heavy brush and trees Phreatophytes Water STurfaces Barren and waste Net native vegetation Streets and roads Gross native vegetation GROSS NONWATER SERVICE AREAS GRAND TOTALS 138 U7 296 96 Ul9 12 10 113 51 21 66,9li8 29,300 3l;,302 1.832 1,015 2,383 577 626 135,780 11 11 2,739 588 637 138,519 2,192 2^180 208, 58U 3.1i33 3,911; 220,757 =63= Probable Ultimate Pattern of Land Use Land Classification . A reconnaissance land classification survey ■was Tindertaken in 1956 as part of the investigation of alternative aque- duct routes to San Diego County o Data from this survey were utilized in this investigation to determine the amount and location of irrigable lands and to estimate the probable ultimate water requirements. Topography., soil depth., soil texture 3 salinity and alkalinity of the soil, high ground water level conditions ^ and presence of rock were physical characteristics considered in classifying the lands. Present agricultural practices, climatic conditions, and ease of irrigation were also consideredi howeverj no consideration was given to those economic factors relating to production and marketing, nor was the availability of a water supply considered. A description of each crop adaptability class and the standards utilized in the siirvey are contained in Table H-2 of Appendix H. As a result of the land classification survey, it was found that of the total 220,760 acres within the watershed, approximately 91,600 acres are susceptible of intensive agricultural development, by irrigation, for climatically adapted crops. This irrigable area is comprised of 10,700 acres of valley floor lands and 80,900 acres of hill lands. The hill lands in- cluded are those which meet the requirements of irrigable valley lands in all respects except for topography, limiting their suitability to certain crops o Irrigable valley lands are scattered throughout the watershed, with the major portion of such lands found in San Pasqual, San Dieguito, and Santa Maria Valleys. The principal irrigable hill lands are found near Ramona, Santa Ysabel, in the region drained by Guejito Creek, and the areas '-6k'- located north and south of Lake Hodges and San Dieguito Valley, Table H=-3 of Appendix H presents a classification of lands in San Dieguito River watershed by hydrologic units and subunitSo LandUseo Utilizing results of the land classification survey and considering present and probable future trends of development;, a pattern of probable ultimate land use was forecast for San Dieguito River watershed for the purpose of estimating probable ultimate water require- ments « The pattern of present land use, supplemented by data presented in State Water Resoiirces Board Bulletin Noo 2j "Water Utilization and Requirements of Calif ornia" j, 1955 p and information on future water req\iire= ments in San Diego County presented in Bulletin Noo 61^ "Feather River Project^Investigation of Alternative Aqueduct Routes to San Diego County",, 1957si were analyzed in predicting probable future developmento It was ass\jmed that future extensive urban development in San Diego County would be confined to a narrow coastal strip a few miles in widthj including the area at the mouth of the San Dieguito River near Del MaTo The area in the watershed devoted to urban and suburban use is expected to increase to approximately 12^,000 acres under ultimate condi- tions o Approximately one-half of San Dieguito Valley would be devoted to urban and suburban development under ultimate conditions of land use. The suburban area within the watershed south of the City of Escondido is expected to expand and additional urban and suburban development is also anticipated in the vicinity of Ramona and north of Poway, It is forecast that the ultimate irrigated area within the water= shed will be approximately 91,600 acres, comprising principally avocados. -65= alfalfas and pasture crops. Location and extent of -urban and suburban and irrigated lands in San Dieguito River -watershed and -within the City of San Diego under conditions of present and probable ultimate land use are shown on Plate 11 and Plate 12 ^ respectively. The probable ultimate pattern of land tise in hydrologic units and subunits in San Dieguito Eiver watershed is contained in Table H-i; of Appendix H. Unit Values of Water Use Estimation of the present and probable ultimate water requirements of the San Dieguito River watershed involved determination of unit values of consumptive use of water for each type of land use and, in the case of irrigated land., for each crop. In view of the availability of consumptive use data developed during prior investigations by the State Department of Water Resources, no field determinations of soil moisture depletion and values of consumptive use of water were undertaken. Among these investiga- tions were the state-=wide studies reported in State Water Resources Board Bulletin No, 2^ "Water Utilization and Requirements of California", 1955, and detailed studies in Ventura County and in the Santa Margarita River watershed in San Diego County, The consumptive use of water data developed for other areas, particularly values applicable to the Santa Margai'ita River watershed, were reviewed and used where appropriate after proper adjustment for dif- ferences in mean monthly temperatures of the areas considered. Unit values of consumptive use of water for various crops in the Inland, Central, and Coastal Units of the watershed are presented in Table H-5 of Appendix H. That portion of the total seasonal consumptive use satisfied by precipitation was determined from data previously developed for ^66^ the Santa Margarita River watershed o Unit values of consun^stive use of applied water, defined as total mean seasonal consumptive use minus that portion of the consumptive use satisfied by precipitation^ were then com- puted for various types of land use in the three hydrologic units o Factors of Water Demand Anticipated rates, times, and places of delivery of water are factors which must be considered in the planning of water conservation projects and accompanying distribution systems <> An evaluation of such factors requires a determination of irrigation efficiencies,) irrecoverable water losses, and permissible deficiencies in water applicationo Irrigation Efficiency Even under the most favorable conditions, it is necessary to apply water in excess of that consumptively used by the plants o The ratio of consumptive use of applied water to the total amount of applied water, expressed as a percentage, is termed "irrigation efficiency". This ratio is useful as an indicator of the prevailing irrigation practices o It may also be applied to determinations of the consumptive use of applied water in order to estimate total water requirements when conditions are such that the portion of the applied water which exceeds the consumptive use requirement cannot be recovered and re-used » Irrigation efficiency varies widely between crops and among plots devoted to the same crop„ The variations may be attributed to differences in depth of root zone, soil type, topography, method of irrigation, drainage characteristics, and the practices of the individual irrigators. Based on experience gained in the investigation of water requirements of the Santa »5T= Margarita River watershedj and from observations within the San Dieguito River watershed, 70 per cent was assumed to be the irrigation efficiency for both present and ultimate conditions. For urban and suburban lands 5 a service area efficiency of water use was assumed to be ^0 per cent for both present and ultimate conditions « Irrecove r able Losses The term "irrecoverable losses" of water refers to that portion of the transmission and delivery losses and the return flow from irrigated lands which cannot be recovered and re-used within the area under consideration, and to sewage effluent which is discharged to the ocean or otherwise lost for recuse o These losses comprise an additional demand on the water supplies of the watershed or on imported water supplies p over and above consumptive use requirements o It is pointed out that an irrecoverable loss to an upstream \mit may constitute an accretion to available water supplies in a lower unit. Irre- coverable losses in specific areas within the watershed are discussed in ensuing portions of this chapter. Permissible Deficiencies in Application of Water Temporary seasonal deficiencies in the supply of irrigation water that might be endured without permanent injury to perennial crops were not determined as part of this investigation. Prior studies by the State Depar-tment of Water Resources and other agencies indicate that a maximum deficiency of 35 per cent of the full seasonal requirement can be endured if the deficiency occurs only at relatively long intervals of time. It has also been determined that small deficiencies occxirring at relatively frequent =68- intervals can be endured. Studies of the water r^qulrementB of the San Dieguito River watershed assume that adequate water supplies will be provided to produce optimian crop yields. Monthly Distribution of Demand for Water The City of San Diego furnished data on the monthly distribution of demand for water in their municipal service area for use in the design of conveyance facilities from proposed reservoirs in the San Dieguito River watershed to a connection with the City's distribution facilities. Monthly distribution of demand for water by urban areas within the watershed is based principally on information secured from the City of Escondido. Monthly dis- tribution of demand for agricult^lral water was developed primarily from data secured from San Dieguito and Santa Fe Irrigation Districts. Estimated average monthly distribution of seasonal \irban and agricultiiral water demand within the watershed and by the City of San Diego are presented in Table 12. -69- TABLE 12 ESTIMATED AVERAGE MOHTHLY DISTRIBUTION OF SEASONAL URBAN AND AGRICULTURAL DMAND FOR WATER WITHIN SAN DIEGUITO RIVER WATERSHED AND DEMAND FOR WATER BY THE CITY OF SAN DIEGO In Per Cent : San Dieguito River watershed Month • • : Agricultural : Urban and suburban City of San Diego October 12.6 8.2 9.0 November 6.k 6.5 7.8 December k.2 5.8 7.5 January- 1.3 5.8 6.5 February 1.0 5-5 5.9 March 1.5 5.8 6.8 April 3.^ l.h l.h May 8.0 9.1 9-3 June lU.3 10.7 9.k July 15.U 11.6 10.5 August 16.8 12.1+ 10.4 September 1^.1 11.2 9'P TOTALS 100.0 100.0 100.0 -70- Water R eq-uiri-sments W i^oi n San Diegilito Ri';-er Watershed Water requirements, as used in this report 5 refers to the quantity of water necessary to satisfy the estimated consumptive use of applied water and attendant irrecoverable losses » Consumptive use of applied water was estimated by multiplying the acreage of each category of land use^ under present and probable ultimate conditions of development^ by appropriate unit values of consumptive use of applied water j, determined after due considera= tion of climatological conditions., In areas of the watershed where water applied to lands in excess of consumptive use will return to ground water storage and be available for re-use^, water requirements were assumed to be equal to the total consumptive use of applied water » For lands overlying confined ground water bodies j where it was assumed that water applied in excess of cons-umptive use is prevented from returning to ground water storage for subsequent re-use j, or where sewage is discharged directly to the ocean,, water requirements are ass\jmed to approxi= mate the total amount of applied water » The water requirement is then computed by applying the value determined for irrigation efficiency, in the case of irrigated lands ^ and the assumed service area efficiency of $0 per cent, in the case of urbanized areas, to the quantity of water necessary to meet the estimated consimptive useo Present Water Requirement The State Department of Water Resources surveys of 1956 and 1957 are considered to be representative of present (1956-57) land use in the San Dieguito River watershed „ Under present conditions of land use, it was ■Tl-^ assvuned that water requirements were equal to the consvimptive use of applied water since in most areas within the watershed the irrecoverable losses were assumed negligible, except in the coastal portion of San Dieguito Basin. In this basin^ irrecovei"able losses occur since the main aquifer is overlain by sediments of relatively low permeability and applied water in excess of consiimptive use is prevented, for the most part, from returning to the ground water formation for possible re-use. Irrecoverable losses also occur in the urban area in the vicinity of Del Mar where sewage is discharged directly to the ocean. For this area, water requirements were assumed equal to the total amount of applied water. The present mean seasonal water requirement of San Dieguito River watershed is estimated to be about 17,700 acre-feet. Estimates of present mean seasonal water requirements for hydrologic units and subunits within the watershed are presented in Table 13. -72- TABLE 13 FRES3WT MEAN SEASOML WATER REQUISEMENTS IN Sm DIEGUITO Rr/ER WATERSHED FCR 1956-57 In Acre-Feet Hydrologic unit and subunlt Present mean seasonal water requirement Inland Unit Sutherland Subunit Pamo Subunit Ramona Subunit Guejito Subunit Roden Subunit Subtotal Central Unit San Pasqual Subiinit Hodges Subunit Subtotal Coastal Unit TOTAL 30* 250 1,81+0 50 1^,410 6,500* 2,170 i * Does not inc?.ude evaporation from Hodges and Sutherland ReservToirs . Probable Ultimate Water Requirement It is assumed that, under ultimate conditions of land and water use, water applied in excess of requirements for consumptive use would appear as subsurface and svirface flow from areas of higher elevation in the eastern portion of the watershed to the lower valley areas diminished by the estimated magnitude of nonbeneficial channel losses. Net return flow, defined as that portion of retiirn flow available for re-use in other areas, originating in Santa Maria Valley would augment the water supply of San Pasqual Valley. A portion of this flow together with return flow from other -73- irrigated eoreas in the watershed would eventioally enter Lake Hodges for diversion to service areas of the City of San Diego, Del Mar Utilities, or San Dieguito and Santa Fe Irrigation Districts. Similarly, net return flow from Santa Ysabel Valley would enter Sutherland Reservoir for diversion through existing conveyance facilities to San Vicente Reservoir. It was further assumed that sewage from the urban area within the watershed south of the City of Escondido would be exported for disposal elsewhere and that sewage from the Coastal Unit would discharge into the ocean. The probable ultimate mean seasonal water requirement in San Dieguito River watershed is estimated to be 156,100 acre-feet. Estimates of meEin seasonal water requirements within hydrologic units and subunits under probable ultimate conditions of development are set forth in Table lU. TABLE Ik PROBABLE ULTIMATE MEAN SEASONAL WATER REQUIREMENTS IN SAN DIEGUITO RIVER WATERSHED In Acre -Feet Hydrologic unit and subunit Probable ultimate mean seasonal water irequirement Inland Unit Sutherland Subunit Pamo Subiinit Ramona Subunit Gue^ito Subunit Roden Subunit Subtotal Central Unit San Pasqual Subunit Hodges Subunit Subtotal Coastal Unit TOTAL 19,iK)0 14,000 3^,300 12,600 U, 500 16,000 29,000 dk,QOQ 1^5,000 26,300 156,100 .74- Recreational Water Requirements In addition to the previously discussed water requirements, water is used within San Dieguito River watershed for recreational purposes. This use is considered nonconsumptive in nature. Fresh water fishing and duck hunting are permitted at Sutherland and Hodges Reservoirs except when water levels are low„ Fishing permits numbering 7^175 and 503 hunting permits were issued by the City of San Diego at Sutherland Reservoir in 1956-57 » Hodges Reservoir has been closed for recreational purposes since 1952-53 due to low storage levels. In 1952 -53s 28s911 fishing permits were issued at that reservoir. Presumably, reservoirs constructed in the future for storage of water in San Dieguito River watershed will also provide facil- ities for recreation. Since the use of reservoirs for recreational purposes is inci- dental to its use for conservation, such recreational use is not considered in evaluating present and ultimate water requirements of the watershed. Supplemental Water Requirements Within San Dieguito River Watershed Supplemental water requirements represent the difference between present or probable ultimate water requirements and the presently developed and available water supplies. Supplemental water requirements in San Dieguito River watershed will be influenced in the future by changes in water requirements accompanying changes in agricultviral and urban and suburban development. '75- Present Supplemental Water Requirerosnts Yield of the presently developed water supply was previously dis- cussed and an estimaire of the quantity has been given in Table 9« Except for the San Dieguito Basin, presently subject to overdraft conditions, the present mean seasonal water requirement within hydrologic units of the watershed is satisfied by the presently developed water supplies, and no supplemental water supplies are presently required. The present mean seasonal supple- mental water requirement in San Dieguito Basin is estimated to average about 800 acre-feet. Probable Ultimate Supplementa l Water Requirements It is estimated that water requirements under probable ultimate conditions of land use will exceed the presently available supply in all areas of the watershed except San Pasqual Basin. However, San Pasqual Subunit, comprised of San Pasqual Basin and adjacent hill areas, will have a probable ultimate supplemental water requirement of 11,600 acre-feet. Supplemental water requirements under ultimate conditions are estimated to total 136,600 acre-feet per season for the entire watershed. Probable ultimate mean seasonal supplemental water requirements in San Dieguito River watershed for each of the hydrologic units and subunits are presented in Table 15. -76- TABLE 15 PROBABLE ULTIMATE MEAN SKAJ30NAL SUPPLEMEKTAL WATER REQUIP.EMENTS OF SAW DIEffJITO RIVER WATERSHED In Acre -Feet ' Probable Probable ° Presently de- ultimate Hydrologic unit : u-Vo-iaiate : veloped yield ; mean seasonal and subunit s mean seasonal ; available for ; supplemental watiir : use within t water reqrireaent : watershed * ; requirement Inland Unit Sutherland Suljunit I9,if00 30 19,370 Pamo S'u'b-iinit li^,000 250 13,750 Ramona Subxinit 3^,300 1,840 32,460 Guejito Subvinit 12, 600 =.=„ 12,600 Roden Subunit If, 500 50 4,450 Subtotals 84,800 2,170 82,630 Central Unit San Pasqual Subunit 16,000 4,490 11,510 Hodges Subunit 29,000 7,170 21,830 Subtotals 45,000 11,660 33,3^^0 Coastal Unit 26,300 5,670 20,630 TOTALS 156,100 19,500 136,600 * The first barrel of the Second San Diego Aqueduct, now under construci- tion, was assumed to be a presently developed facility for the purpose of computing ultimate supplemental water requirements. The ultimate supplemental water requirements can be partially satisfied by increased development of local svurface and ground water supplies, but a substantial increase in imports from soxirces outside the watershed will also be inquired. Possible means by which supplemental supplies can be developed are discussed in Chapter 17, "Plans for Water Development". Supplemental requirements would be reduced in areas in- undated by construction of potential dams and reservoirs « =77- Water Requirements of the City of San Diego As discussed in the foregoing portions of this report, the City of San Diego owns and operates Hodges and Sutherland Reservoirs in the San Dieguito River watershed. These facilities were constructed, and other water developments are planned, for the primary purpose of exporting water from the watershed to satisfy present and probable future water requirements of the City of San Diego. A discussion of present and future water require- ments of the City of San Diego is presented in the following portion of this chapter. Present Water Requirements of the City of San Diego The City of San Diego comprised 123,500 acres in January, 1959, and extends from the coast to an elevation of approximately 800 feet. Since about 19U0, the City has experienced a remarkable growth, increasing in population from 203,000 in 19kO to about ii9Us000 in 1957o The increase in population has been accompanied by marked industrial expansion, principally in the aircraft, electronic equipraentj, instnment, and plastic industries. The changing industrial pattern and the increasing use of automatic household appliances requiring large volumes of water have been reflected in rates of per capita water consumption. The City of San Diego reports an in- crease in per capita use from approximately 100 gallons per day in 19kl-h2 to 129 gallons per day in 1956-57. As a result of the increase in population and in the unit use of water, water consianption of the City of San Diego has increased from ap- proximately 28,000 acre-feet in 19n0-Ul to 71,250 acre-feet in 1956-57. •78. Probable Future Water Requirements of the City of San Disgo Proposed annexations will increase the area of the City of San Diego from 123^500 acres in January^ 1959,', to an estimated iSiisOOO acres in the year 2000o Population is expected to increase from the present one-half million persons to approximately Ipii^O.oOOO, The City of San Diego Water Department has predicted that the water requirement of the City in the year 2000 will be in the order of 318,000 acre-feety based on population projections by the City Planning Department and values of per capita water use determined in connection with the studies of alternative Feather River Project aqueduct routes to San Diego and presented in State Department of Water Resources Bulletin Noo 61 „ City of San Diego estimates of future water requirements within the City' s three water service areas are presented in Table 16,, Location of the future service areas is shown on Plate 12 « TABLE 16 PROBABLE MEAN SEASONAL FUTURE WATER OF CITY OF £ In Acre-Feet REQUIREMENTS OF CITY OF SAN DIEGO^ Service area * Year % Miramar ; Alvarado : Lower Otay ~o lotai I960 16^900 57,300 15,200 89jU00 1970 25j700 87 700 16,900 130,300 1980 55<,200 ll5si;00 21<,U00 192,000 1990^ 95,800 131,200 28,100 255,100 2000 I365UOO ll+7plOO 3U<,700 318 .,2 00 ao Values estimated by City of San Diego Water Department unless other'wise noted, bo Values derived by State Department of Water Resources o -79" Supplemental Water Requirements of the City of San Diego Present Supplemental Water Requirements of the City of San Diego Supplemental water requirements have been defined as the difference between water requironents and the presently available water supply, com- prising yields from siirface and gro\ind water developments and imported supplies. Present water requirements of the City of San Diego far exceed the yield of local supplies j but under present conditions the deficiency is satisfied by importation of Colorado River water through the existing San Diego Aqueduct o Importation of Colorado River water in 1956-57 for use within the City of San Diego amounted to 83,551 acre-feet, or 57.5 per cent of the total deliveries to members of the San Diego County Water Authority. Since water requirements in excess of local supplies are ciirrently met by piirchase of Colorado River water, no present supplemental water requirement exists within the City of San Diego. Purchases of Colorado River water by the City of San Diego and ' other members of the San Diego County Water Authority presently exceed their entitlement to this supply. When other member agencies of The Metropolitan Water District of Southern California purchase larger amounts of Colorado River water, the City's supply from this soixrce will be reduced. Probable Future Supplemental Water Requirements of the City of San Diego As the requirement for water within the City of San Diego increases in the future, it is probable that the City will develop water resources within San Diego County to which it has, or will have, rights. It can also be anticipated that the City of San Diego will purchase increasing amounts of -80- Colorado River water-, as limited by the City' s proportionate share of imported supplies, and imported northern California water as these supplies become available. The proportional share of the City of San Diego to im- ported water in 1956-57 was about 98,000 acre-feet from the existing aqueduct. Since the first barrel of the Second San Diego Aqueduct is under construction^ it was assumed to be a presently developed facility for pux^ poses of computing future supplemental water requironents even though water will probably not be delivered through this facility until 1960„ The im- ported supply available to the City of San Diego was, therefore, taken as the City's estimated proportional right to purchase water from the San Diego Co-unty Water Authority, This right of the City of San Diego to im= ported water based on their estimated I96O proportional share would be 2063 000 acre-feet o The City estimates the presently developed yield from City surface reservoirs to be lUiiTOO acre^feet, providing a total mean seasonal present supply to the City of San Diego of 250,700 acre=feet upon completion of the first barrel of the Se^ jnd San Diego Aqueduct^, as shown on Plate 13 and in Table 17, The presently developed yield from City reservoirs was re- evaluated by this Department and found to be somewhat less than the yield which was estimated by the City and indicated on Plate 13 and in Table 17, The yield, as revised^ is now estimated to be approximately 36,U00 acre= feet per season, as set forth in Table L-1 of Appendix L» Using the revised estimate of yield from the City reservoirs, the total mean sea- sonal present supply to the City is estimated to be 2J4ii,ii00 acre-feetj including imported water. =81- TABLE 17 YIELD OF PRESENTLY DEVELOPED WATER SUPPLY OF CITY OF SAN DIECX) In Acre-Feet Reservoir s Mean seasonal s safe yield of s local water s supply s Proportional : rright of City: scf San Diego s s to imported : swater in 1960s Total supply s Unit : Total Mramar Service Area Hodges 3, ,360 3,360 Alvarado Service Area Sutherland San Vicente El Capitan 8,960 5,9aO 11,200 26^100 Lower Otay Service Area Morena Barrett Ot^ 5 s 600 5,380 Uy260 l5s2UO iiU,700 TOTALS 206,000 250,700 * Values estimated ty City of San Diego Water Department. Values as determined by this Department are presented in Table L-1 of Appendix L. It is estimated that by 1975 the water requirement ijithin the City will be equal to the presently developed local supply plus the City* s propor- tional right to waters from the San Diego County Water Authority and that supplemental supplies would be needed after that date. The City's propor- tional right to waters from the Authority will decrease in the future as the remaining portion of San Diego County develops and increases in assessed valu- ation at a more rapid rate than the Cityo This condition is depicted graphi- cally on Plate 13 j) while fut\ire mesin seasonsQ. supplemental water requirements are presented in Table 18. Estimates of supplemental water requirements pre- sented in Table 18 are based on the City' s estimate of the presently developed yield from City reservoirs and does not reflect the afore-mentioned reevalu- ation of reservoir yield by this Department. -82- TABLE 18 ESTIMATED MEAN SEASONAL SUPPLEMENTAL WATER REQUIREMENTS OF CITY OF SAN DIEGO^ In Acre-Feet * • • • Probable future mean seasonal water requirements of City of San Diego service areas s Total avail - i able water i Total •: estimated s mean Year ; • Miramar a. : Alvarado « • Lower ; Otay s Total s supply of tCity of San s Diego^ « s seasonal : supplemental % water s requirements i960 165 900 57,300 15,200 89, UOO 2 50 _. 700 1970 25,700 87,700 16,900 130,300 19Uj800 1980 55,200 115, Uoo 21, UOO 192,000 138 c, 300 53,700 1990 95,800 131,200 28,100 255,100 c c 2000 136, Uoo iU7,ioo 3U,700 318,200 c c a. Values estimated by City of San Diego Water Department o b„ Includes estimated proportional share of imported waters from the San Diego County Water Authority with First and Second San Diego Aqueducts in operation. Assumes mean seasonal safe yaeld of local water supply to be UU,700 acre-feet, as shown in Table 17, rather than 36,UOO acre-feet, as estimated by this Department and presented in Table L-1 of Appendix L„ Co Estimates of proportional share of imported water not furnished by City of San Diego. =83- CHAPTER IV. PLANS FOR WATER DEVELOPMENT Except for water shortages in localized areas, the yield of pres- ently developed water supplies in the San Dieguito River watershed, including impoirbed San Luis R^ River and Colorado River water, exceeds the present water requirements of the watershed. This condition, however, will change in future years. As discussed in Chapter III, a supplemental water requirement will exist in all areas of the watershed, except San Pasqual Basin, under ultimate conditions of land use. The probable ultimate mean seasonal supple- mental water requirement in the San Dieguito River watershed of 136,600 acre- feet per season, will require that imported supplies be made available. As a result of the large future demands for water, it may be ex- pected that the water resources of the San Dieguito River will undergo ftirther development for local use or for use of the City of San Diego. The City has a large financial investment in lands at dam and reservoir sites in the watershed and has filed applications with the State of California to appropriate 50 second-feet and store 397,000 acre-feet of water of the San Dieguito River, Plans for importing water to the watershed and developing local water resources are discussed in this chapter, including a description of Feather River and Delta Diversion Projects studies, the Second San Diego Aqueduct, and features of The California Water Plan in San Diego County and a discussion of possible management of major groxmd water basins for greater yield. Comparisons of plans, and combinations thereof, are presented in Chapter VI. Plans for Importation of Water Supplies Although importation of San Luis Rey River water to the San Dieguito River watershed may increase somewhat when the amouixt in storage in Lake Hqnshaw is increased dttL'ing years ci ;r.l)c%;57j, the estimated mean seasonal safe yield would be 6^,000 acre-feet ^ or an increased yield of 2 J 800 acre-feetj, over and above the present net withdrawals of 3j,200 acre- feet, as depicted on Plate l5. By applyang the City of San Diego' s average monthly distribution of seasonal demand to the 2,800 acre-feet of new yield and an average monthly- distribution of seasonal agricultural demand to the 3^200 acre-feet of existing yield required to satisfy water requirements of overlying lands, the average maximum monthly net draft from San Pasqual -Main Lake Hodges Basin to meet these two demands was computed to be about BUO acre-feet, or about Ik second-feet continuous flow. The number and type of well installations and capactiy of pumping equipment were based on this maximum monthly draft o If the entire 65,000 acre-feet of yield were conveyed to Lake Hodges and exported to the City of San Diego in accordance with the more uniform monthly distribution of urban demand^, the maximum monthly draft would be only about 10 second-feeto The estimate of cost for developing the maximum practicable yield from San Pasqual-Kain Lake Hodges Basin includes the cost of drilling six 16-inch diameter gravel-packed wells, varying in depth from 60 feet near the western portion of the basin to 175 feet near the central portion of the basin « Wells would be supplied with suitable turbine pumps and motors capable of furnishing approximately 500 gallons per minute per wello Seven existing wells, estimated to range in capacity from about UOO gallons per minute to 850 gallons per minute, would also be employed » -95- Feeder pipe lines would connect the wells to distribution systems of overlying land users or to a citj^-cwned cancrete-lined canal of trapezoidal section. The canal would increase in capacity from seven second- feet at the upper part of the basin to lU second-feet near the middle of the basin. Capacity of the canal would remain the same from this point to its terminus at Lake Hodges ,, just west of Bernardo Mountain » Sizing of the canal would permit the entire yield to be withdrawn and diverted from the upper portion of San Pasqual-Main Lake Hodges Basino Such a pumping pattern might be desirable if ground water levels in the lower end of the basin had been lowered subs t ant ia3J.y dxiring a drought period and replenishment of the ground water supplies had been confined to the upper part of the basin. It is assumed that under these circtimstancesy increased extractions covild be effected by use of certain of the numerous wells existing in the upper area of the basin. Smaller yields canj of course^ be developed in San Pasqual-Main Lake Hodges Basin with less lowering of ground water levels. Estimated mean seasonal safe yields for an average lowering of 30 feet and 50 feet are 3?200 acre-feet and ii„800 acre-feet, respectively. The relationship between ground water storage depletion, yield^ and average depth to ground water in the basin is illustrated on Plate 15. A general description of facilities for developing an additional water supply from San Pasqual-Main Lake Hodges Basin, and capital and annual costs of the project, are pre- sented in Table 19 « General location of the wells, pipe lines, and canal is shown on Plate 16, Detailed cost estimates are contained in Appendix K. -96- TABLE 19 GENERAL FEATURES OF WELIS, PUMPING PUNTS, AND CONVEYANCE FACILITIES AT SAN PASQUAL-MAIN LAKE HODGES BASIN Depth to Ground Water and Yield Maximum average depth to gro\ind waterj in feet New seasonal yieldj in acre-feet Total mean seasonal safe yields in acre=f eet Project Facilities Nimber of primary l6-inch diameter gravel=packed wells to be cons time ted Number of primary existing wells to be used Average depth of new wells, in feet Average yield per new well, in gallons per minute Average yield per existing well, in gallons per minute Motor horsepower required to operate new p-umps Length of primary pipe line from wells to canal for basin-wide pumping pattern^, in feet 8=inch diameter lO^inch diameter 12 -inch diameter \ Length of standby pipe line I from wells to canal for upper ! basin pumping pattern, in feet I 6=inch diameter I 8=inch diameter 1 10=-inch diameter 12 -inch diameter Minimum capacity of concrete-lined canal in upper basin, in second=-f eet Maximum capacity of concrete-lined I canal in upper basin and to Lake Hodges, ! in second-feet rUsable gro\ind water storage capacity j, s in acre-feet s 13s 700 o 27^000 i la.ooo 30 3,200 BO I5600 1;,800 71 2,800 6j,000 7 290 Use exist- ing motors 3.8 7,5 7 157 330 330 30,U0 5.6 11,2 7 127 290 290 20,25,30„UO 1,100 2,500 5,100 8,300 8,ii00 Hip 100 1,300 2,900 U,90o h,ooo Us 000 ii,000 5,100 5,100 5,700 U,700 ii,700 5,600 3,000 3,000 3,500 7.0 lUoO -97- GENERAL FEATURES OF WELLS, PUMPING PLANTS, AND CONVEYANCE FACILITIES AT SAN PASQUAL-MAIN LAKE HODGES BASIN (continued) Capital Costs Ground water developnent^ Per acre-foot of storage Per acre-foot of total safe yield Annual Costs Grovmd water development^ Per acre=foot of storage Per acre°foot of total safe yield sUsable ground water storage capacity, s in acre-feet s 13,700 s 27,000 : iiljOOO $5,966,800 li36 1,865 $6,Oi;3,500 22U 1,259 $6,163,700 150 1,027 298,000 22 93 306,300 n 6U 316,100 8 53 a. Includes the estimated costs of lands and improvements which would probably be required for basin operation. b. Assuming the total safe yield is developed and conveyed to Hodges Reservoir for use by the City of San Diego. -98- Potential Surface Storage Developments During the studies which led to the publishing of Bulletin Noo 55 and Bulletin No. 3, the engineering feasibility of constructing dams at the following sites for conservation of local water or regulation of imported water was investigated: Dam site Location Santa Isabel On Santa Isabel Creek about 11 miles northeast of Ramona Pamo "A", "B"j and "C" On Santa Ysabel Greek about h miles north of Ramona Santa Maria On Santa Maria Creek about 5 miles northwest of Ramona Guejito On Guejito Creek about 5 miles northeast of Lake Wohlford Dam San Pasqual "A" and "B" On San Dieguito River about k miles southeast of City of Escondido Super Hodges On San Dieguito River about 6 miles southwest of City of Escondido It was concluded from these analyses that a development at San Pasqual "F' site should be excluded from further consideration since it appeared much more costly than the San Pasqual "A" site^ and that Santa Ysabel, Santa Maria, and Guejito sites should be considered only for regulation of imported water » Consequently, the investigation of surface storage developments, described herein, has been limited to an evaluation of projects at the Pamo "B" site. Super Hodges site, and San Pasqual "A" site, subsequently referred to as the San Pasqual site, and an evaluation of an enlarged San Vicente Reservoir and enlargment of Suther- land Reservoir by installation of spillway gates. Location of these sites of potential local water development is shovm on Plates Ik and 17. -99- As previously mentioned, records of runoff for the drought period 1895-96 through 190l4.-=05j used for safe yield studies presented in Bulletin No. 55 J were not used in this investigation since it was found that the cur- rent drought period is critical with respect to safe yield determinations for reservoirs in San Diego County. Consequently it was necessary, in order to complete reservoir yield studies to estimate amounts of precipitation, evaporationj, and runoff at Sutherland, Pamo "P', San Pasqual, and Super Hodges Reservoirs for the period 191U-15 through 19$6-57. The yield studies assumed present conditions of ground water development except in the case of San Pasqual Reservoir, for which utilization of ground water in the San Pasqual Basin would be prevented by inundation of the reservoir lands or would be in accordance with a planned operation conducted coordinately with use of the surface reservoir. Records and estimates of evaporation at Sutherland Dam and at other dam sites considered herein for the period 1936-37 through 1956-5? are pre- sented in Appendix I. Sutherland Reservoir and Dam With Spillway Gates . When Sutherland Dam was completed in 195ii by the City of San Diego, facilities were provided for the installation of 13-foot high radial-type spillway gates. If these gates were added, the gross storage capacity of Sutherland Reservoir would be in- creased from 29,680 acre-feet to 37,U30 acre-feet and the reservoir area with water surface at the top of the gates would be enlarged from 560 acres to 61iO acres. Increasing the reservoir storage capacity woiild reduce the volume of spills, while evaporation losses would increase due to the enlargement in average surface area. An evaluation of the effect of these factors on reservoir yield reveals that the combined net ssife seasonal yield of Suther- Isind and existing Hodges Reservoirs would be increased from 8,200 acre-feet -100- to 85,800 acre-feet if the gates were added and the reservoirs were operated coordinately during the li3"year period from I9II4-I5 through 1956-$7ji assuming present land and water use in San Pasqual-Main Lake Hodges Basin. In order to reduce the volume of spill and waste to the ocean from Hodges Reservoir, it was concluded that on a combined safe yield basis the co- ordinated use of Hodges and Sutherland Reservoirs would be the most realistic operation and achieve the greatest reservoir yields o Such an operation could be easily effected since both reservoirs are owned and operated by the same agency. The reduction of loss by evaporation and by discharge to the ocean requires the maintenance of as much available storage capacity in Hodges Reservoir as possible o Howeverj the diversion capacity of the conveyance works from Hodges Dam limits the quantity by which the reservoir can be drawn down in any one month„ Therefore^ the operation selected for purposes of this in- vestigation for existing surface storage developments assvmies that the combined safe yield, of the reservoir system would be applied first as a draft on Hodges Reservoir until the dead storage level was attained or the - demand exceeded diversion capacity, and then the yield would be applied as a draft on Sutherland Reservoiro Diversions from Hodges Reservoir would take place when necessary in order to maintain dead storage level. Under the combined safe yield operation, the annual system draft is the same every year, and the system draft for any particular month, based on average monthly distribution of seasonal urban demand by the City of San Diego, is the same in any year. However, drafts on the separate reser- voirs would vary from month to month and year to year, depending on storage conditions » City of San Diego operates Sutherland Reservoir on a secondary -101- yield basis, diverting fcawez f-air. Sutherlnnd Reservoir to San Vicente Reser- voir at the maxirauni rate permitted by conveyance capacity. Since such diver- sions over a long period would exceed the "saife" yield of the development, the reservoir wo\ild be depleted to dead storage during an extended drought period. Under a secondary yield operation, it is necessary to have a svqp- plemental source of water available during such drought periods. In this case, the supplemental source is the San Diego Aqueduct, When and if the water requirements of the City of San Diego exceed the entitlement of the Ci-ty to imported water through the facilities of the San Diego County Water Authority, it would no longer be safe to operate the reservoirs on a secon- dary yield basis. If spillway gates were added to Sutherland Dam and the reservoir continued to be operated on a secondary yield basis, the average amoiint in storage, the reservoir surface area, accompanying evaporation losses, and the spills from the reservoir would all be less than that occurring under safe yield opei*ation. It was determined that the seasonal secondsay yield would be increased very little by the addition of spillway gates, al- though the safe yield would be substantially increased by such addition. General features of Sutherland Resejrvoir and Dam equipped with spillway gates, the cost of these gates, and their effect on resej-voir storage capacity, surface area„ and safe yield are presented in Table 20, -102- TABLE 20 GEWERAL FEATURES OF SUTHERLAND DAM AND RESERVOIR WITH AND WITHOUT SPILLWAY GATES Cha racteristics of Site Drainage area- -54 square miles Estimated average seasonal runoff --14^ 000 acre-feet Estimated average net seasonal depth of evaporation- Estimated sedtmentation= Elevation of stream bed. =.2o6 feet -1^800 acre-feet, average for UO-year amortization period U.S.G.So datum— 1,912 feet Gross reservoir storage capacity-;, in acre-feet Concrete Mult i -arch Dam Crest elevation J, in feet, UoSoG.S. datiun Parapet wall^, top elevation, in feet, UoS.GoSo datum Crest length, in fee't Crest widthp in feet Height of gates, in feet Height, spillway lip above stream bed, in feet Freeboard between spillway lip and top of parapet, in feet Reservoir Surface area at spillway lip, in acres Net storage capacity at spillway lip, in acre^feet Ty^pe of spillway Spillway discharge capacity, in second-feet Type of outlet Additional safe seasonal yield to the City of San Diego from the system due to spillway gates, in acre~feet° C apital Costs Addition of gates Per acre-foot of ad-ditional". storage Per acre -foot of additional net safe yield from system Annual Costs Addition of gates Per acre-foot of additional net safe yield from system Existing reservoir 29,680 2,070 Enlarged reser't^oir 37,430^ 2,070 2; 1; ,074 ,020 7 ■145 2, 1; p074 ,020 7 158^ 17 4^ 560 27,880 Ogee weir and 41,000 Two 36- inch diam. cast- 640^ 35,630a concrete chute ° 37,000^ Two 36-inch diamo cast- iron pipes iron pipes 600 $243,500 31 4o6 $ 12,400 21 a. Based on full storage level at top of spillway gates. b. Aiisijmes two piers wo"ald be added to weir to accommodate gates o Co System consists of Sutherland and Hodges Reservoir operated coordin- ately assuming present land and water use in San Pasqual-Main Lake Hodges Basin. -103- sidereQ lor rcjilo iJam are ^o;,atec -within a rrr-mile reach of Santa Isabel Creek, approximately one and one-half miles downstream from its confluence with Temescal Creek in Section 27, T„ 12 S,, R. 1 E,, S. B, B. & M., as described in Bulletin No. 55- Dam site "A" is located near the west line of Section 27, with site "B" approximately three-quarters of a mile upstream from site "A«». Site "C" is about 1,700 feet upstream from site "P' and approximately 800 feet west of the east line of Section 27. It was necessary to select one of the sites to be evaluated on the basis of cost and reservoir yield compared with other proposed projects within the watershed. Consequently, preliminary construction quantities and costs for the earthfill and spillway for dams at each of the three sites were estimated for various alignments of axis and spillway location. A comparison of construction costs of the dams, considering spillway excavation, liiiing costs, haxil distance, and stripping costs based on available geologic information, indicated that a dam at site '•B'* would entail a lesser capital expenditure than structures at the other sites for equivalent storage capacity = The results of previous geologic studies and reconnaissance surveys by geologists of the State Department of Water Resources in 1957 indicate that site "B" is suitable for an esirthfill dam. Stream bed elevation at Pamo "Ef site is about 800 feet. United States Geological Survey datum. The drainage area above the dam site comprises 111 square miles, of which 57 square miles lie below Sutherland Dam, located approximately 7 miles upstream. The tributary drainage area between Sutherland Dam and Pamo "F' site produces an estimated mean natural seasonal runoff of about 9,500 acre-feet for the U3-year period 191i;-l5 through 1956-57. If the present Sutherland Reservoir had existed dtiring this period, and had been operated coordinately with existing Hodges Reservoir -lOit- on a safe yield basis, in the manner previously discussed, it would have spilled every year except 19^8, 1950, 1951> 1955> 1956, and 1957^ providing an additional estimated mean seasonal runoff of about 11,500 acre-feet at Pamo "B" dara site. Estimated net seasonal depth of evaporation for this period at this reservoir site is 3-^2 feet. Designs of dams considered at Pamo "B" site are based on topographic maps at a scale of one inch equals 200 feet with a ten-foot contour interval. Reservoir areas and capacities at various water siurface elevations were estimated from topographic maps at a scale of one inch equals 400 feet with a ten-foot contour interval and are presented in Table 21. These maps were prepared for Bulletin Wo. 55 ^y Fairchild Aerial Sui^eys, Inc. -10$- TABLE 21 AHEAS AND CAPACITIES OF PAMO "F' RESERVOIR Water s\irface : elevation. Depth of water ! I Water surface : Storage U.S.G.S, datum. at dam. ! area. capacity, in feet ; in feet : i in acres in acre-feet 850 . _ . 860 10 5 30 870 20 15 132 880 30 3U 376 890 liO 80 9U1; 900 50 115 1,917 910 60 182 3,100 920 70 233 5A77 930 80 290 8,095 9U0 90 351 11,302 9$0 100 U25 15,183 960 110 509 19,856 970 120 593 25,370 980 130 687 31,769 990 lUo 781 39,105 1,000 150 889 U7,lt52 1,010 160 1,050 57,lli7 1,020 170 1,186 68,326 1,030 180 1,322 80,866 1,037 187 1,1<25 90,000 1,050 200 1,619 110,258 i,o6U .21U 1,865 135,000 1,070 220 1,956 lli6,133 1,079 229 2,090 I63,i;00 1,090 2U0 2,255 188,385 1,100 250 2,378 211,551 Adapted from data shown in Bulletin No. 55. -106- One test pit was dug in 1913 and 13 core borings were made in 1914 at Pam© "B" site by Volcan Land and Water Company o The 45=foot deep test pit is located on the right abutment, 150 feet above stream bed, and is still available for inspectiotto Comments by Chester Marliave, consult- ing geologist, following his inspection of the site were presented in Bulletin No, 55 and are as follows: "The granite here shows some hard outcrops in the channel section only, but this hard rock may not be continuouso The abutments are decomposed and deeply weathered « An earth type of dam seems to be the most suited for this loeationo A spillway could probably be constructed over either abutment beyond the ends of the damo An outlet tunnel could well be constructed through the left abutment or placed in cut and cover along the left bank of the channel sectiono'" Geologic information developed from previous studies and recent surveys by geologists of the State Department of Water Resources indicate that the Pamo "B" site is suitable for construction of earthfill dams up to a height of about 260 feet above stream bed. This height appears to be about the upper limit for the site from a topographic standpoint. In view of the need for approaching complete development of the surplus water supplies within the watershed^ and after a survey of topographic conditions, earthfill dam heights of 210 feet, 236 feet, and 250 feet from stream bed to dam crest were selected for yield and cost comparison analyses o These structures would provide gross reservoir storage capacities of 90,000 acre-feet, 135,000 acre-feet, and 163,400 acre-feet, respectivelyo To determine the suitability of materials available near the site for use in an earthfill dam, three samples of impervious material and one sample of pervious material were collected from prospective borrow areas and tested to determine grain size distribution, plasticity, specific gravity, maximiom density at optimum moisture, and permeability., Two impervious samples were also tested to determine the direct shear strength o Results of laboratory soil tests are presented in Appendix Jo =107° leu to oC Che pi:-\'iovr^ ?tamplps secured from the stream channel de- posits indicate that the particle sizes were too uniform and that the deposits do not contain sufficient coarse material to provide stable fill slopes. Cost estimates are^ therefore, based on random upstream and downstream sections con- taining a mixture of channel sediments and the coarser impervious materials secured by ripping the harder underlying formation in borrow areas adjacent to the stream and from spillway excavationo Soil tests further revealed that r^stream and downstream slopes of 3 si for all three dams at Pamo "B" site would be suitable,, The impervious section for all three dams would have an upstream and downstream slope of 0.8:1. Hnployment of semipervious random fill in the outer sections would necessitate the installation of gravel drains at the downstream face of the impervious section as a precautionsiry meas\ire to control the path of leakage. The upstream face and downstream toe of all three dams would be protected against wave action and erosion from spillway discharges by rock riprap placed to a depth of three feet, normal to the slope „ Crest widths would be 30 feet, comprising a 10-foot width for the impervious core and a 10-foot width each for the upstream and downstream random sections. Materials suitable in quantity and quality for the impervious core and random sections of the largest dam considered can be secured within a dis- tance of two and one-half miles upstream from the site, A site for a quarry to supply rock riprap is located approximately two miles upstream from the dam site, and this supply coxild be augmented with rock excavated during spillway construction. Stripping estimates were based on the previously mentioned geologic investigations. Under the impervious core a depth of 22 feet of material would be stripped from the stream channel and 19 feet and UO feet of soil and broken rock would be removed from the left and right abutment, respectively. Under the random sections of the dam, stripping of soil and broken rock to a depth of -108» eight feet would be necessary in the channel and from the right abutment, while depth of stripping from the left abutment would be approximately five feet. Moderate grouting would probably be necessary to prevent leakage in the foundation and abutments. The estimated peak flow at Pamo "B" dam site for a once-in-100-year flood and a once-in-1^ 000-year flood is 67,200 second-feet and 12l+,000 second- feet, respectively. Reduction of a once-in-100-year flood followed three days later with a once-in-1, 000-year flood, for the various sizes of deun and reservoir considered at the Pamo "B" site, is indicated in the following tabulations Height of dam crest above stream bed, in feet Gross reservoir storage capacity, in acre-feet Peak inflow of a once-in- 100 -year flood, in second-feet Peak inflow of a once-in- 1,000 -year flood, in second -feet Peak spillway discharge, in second-feet Maximum head on spillway, in feet 210 90,000 67,200 12i+,000 83,100 18 236 135^000 67,200 124,000 78, 500 17 250 163, hoo 67,200 124,000 75,000 16 A five-foot residual freeboard between the maximxara water surface at flood stage and the dam crest was assiomed in the design of all three damsc The spillway would have a net crest length of 3OO feet and would consist of a concrete-lined overpour chute with ogee weir control section. The spillway weir for all three dam heights considered would be located at the right abutment immediately adjacent to the dam fill, and the chute would convey spill across the right abutment to a well defined canyon tributary to Santa Ysabel Creek. The outlet works intake struct\ire would be a vertical reinforced concrete tower located at the upstream toe of each of the dams near the left abutment. Five butterfly valves would be located at vertical intervals within the tower to permit withdrawals from various elevations within the reservoir. -109- iVash raclcs »oulki 'je pro-^iis'^. at all ipt9kes„ A high pressure slide sluice gate with trash rack would also be provided at the foot of the tower, A steel pipe line, encased in concrete, would extend beneath the dams from the intake structure to a control valve house at the downstream toe of the damso The conduit would be provided with cutoff collars within the impervious core section of the fill. The control valve house woTild be equipped with a bifurcation structure which would either permit discharge of water through a gate valve for sluicing directly into Santa Isabel Creek or through a needle valve into a conduit for conveyance to areas outside the San Dieguito River watershed. The City of San Diego owns Pamo "B" dam site and a portion of the res- ervoir area. The value of City lands and the cost of acquisition of privately- owned lands were estimated by appraisers of the State Department of Water Re- sources, It was estimated it would be necessary to acqiiire 19 parcels of privately=owned land, comprising approximately 1,860 acres, for construction of any of the three sizes of dam and reservoir considered. This was necessary since the smaller reservoir would destroy access to the improved area and ac- quisition of all private holdings would be advisable in view of the severance involved. Approximately 13 miles of iinpaved United States Forest Service ac- cess roads would be relocated for all three sizes of reservoir. The cost estimate also includes cost of constructing three miles of paved access road from the Ramona area to the dam. Construction of the 210>=foot and 236-foot high dams would require approximately two years, while about two and one-half years would be required to construct the 250-foot high structxire. During the construction period, =110- \_ Santa Ysabel Creek woixld "be diverted through the outlet works dioring the low flow period, while winter flows woiild pass through an uncompleted portion of the fill in the channel section. General features and capital and annual costs of three sizes of dam and reservoir at the Pamo "B" site on Santa Ysabel Creek are presented in Table 22, along with estimated values of additional and incremental safe yieldo Detailed estimates of costs are contained in Appendix K. A plan, profile, and section of the 2$0-foot high dam are shown on Plate 18 o ^ -111- TABLE 22 GEEERAL FEATURES OF THREE SIZES OF DAM AND RESERVOIR AT THE PAMO "B" SITE ON SANTA YSABEL CREEK Cliaraeteristies of Site Drainage area— 111.5 square miles Drainage area below Sutherland Dam— 57-5 square mj.les Estimated average natural seasonal runoff below Sutherland Dam — 9>500 acre-feet Estimated average net seasonal depth of evaporation — 3 '^2 feet Estimated sedimentation- -1,200 acre-feet, average for hO-year amortization period Elevation of stream bed, U.S.G.S. datum — 850 feet Gross reservoir storage capacity, in acre-feet 90,000 135,000 : 163,400" Earthf ill Dam Crest elevation, in feet, U.S.G.S. Crest length, in feet Crest width, in feet Height, spillway lip above stream bed. Side slopes, upstream and downstream Freeboard, above spi3J.way lip, in feet Vorome of fill, in cubic yards 1,060 1,086 1,100 1,300 1,530 1,660 30 30 30 in feet I87 2ll| 229 3:1 3:1 3:1 23 22 21 3,651,000 5 ,116,000 6; 133,000 Reservoir Surface area at spillway lip, in acres Net storage capacity at spillway lip, in acre-feet Type of spillway Spillway discharge capacity, in second-feet Type of outlet Additional safe seasonal yield to the City of San Diego from the system due to Pamo "B" Resenroir, in acre-feet' Incremental safe seasonal yield from the system due to Pamo "B" Reservoir, in acre -fee t^^ ab 1^23 1,865 2,090 88,800 133,800 162,200 Ogee weir with concrete chute 83,100 78,500 75,000 42-inch 48-inch 54-inch diameter diameter diameter steel pipe steel pipe steel pipe 3,900 6,300 2,400 7,900 1,600 -112- GENERAL FEATURES OF THREE SIZES OF DAM AND RESERVOIR AT THE PAMO "B" SITE ON SANTA YSABEL CREEK (continued) Gross reservoir storage capacity, in acre -feet 90,000 ; 133,000 : 163,^00 Capital Costs Dam and reservoir Per acre -foot of storage Per acre-foot of additional net safe seasonal yield from the system Annual Costs Deim and reservoir Per acre-foot of additional net safe seasonal yield from the system Per acre-foot of incremental net safe seasonal yield from the system $7,526,700 $9,213,300 68 $10,922,000 67 1,930 1,1+60 1,380 $ 363,900 $ 446,100 $ 527,800 93 71 67 __ 34 51 System consists of Sutherland Reservoir with spillway gates and Hodges and Fame "B" Reservoirs operated coordina-tiely assuming present land and water use in San Pasqual-Main Lake Hodges Basin, AssiMies releases from Pamo "B" Reservoir to maintain groiind water levels in San Pasqual-Main Lake Hodges Basin equal to those which woiold have prevailed with Sutherland and Hodges Reservoirs operated coordinately on a combined safe yield basis. .113= Water divei- tod by condnit froi" Pamo "B" Reservoir would be conveyed to the Miraniar Reservoir and Treatment Plant, proposed for construction in 19$9.<5 to serve the northern portion of the City of San Diego. The route chosen after inspection of available maps for the 2U-iiiile long reinforced- concrete steel cylinder pipe line extends from Pamo "B" Reservoir, where the initial elevation would be 850 feet^ along the south side of Santa Ysabel Canyon to a point near the west end of San Pasqual Valley, High pressure pipe would be used across Schoolhouse Canyon and Santa Maria Crpek in Bandy Canyon, From this pointj, the conduit extends in a southwesterly direction across Highland Valley j, the existing San Diego Aqueduct, and Green Valley, and terminates in Miramar Reservoir at the spillway lip elevation of 710 feeto Miramar Reservoir site is located in Section 32, T, lii So, R« 2 W,, S, Bo B, & M,, about one mile east of U, S, Highway No, 39$o Costs of high pressure pipe across Indian and Bernardo Canyons, Green Valley, sind Los Penasquitos Canyon are included in the cost estimate. Pipe line sizes and capacities vary in accordance xjith maximxnn draft for the three sizes of Pamo "B" Reservoir considered, operated coordinately with existing Hodges Reservoir and Sutherland Reservoir with spillway gates on a combined safe yield basis,, as described in a succeeding portion of this chap- tero Dead storage level in Pamo "B" Reservoir and water surface at the spill- way lip in Miramar Reservoir were assumed for design purposes in determining the maximum head on the conduit, A pressure regulator at Pamo "B** Dam would prevent flows in the conduit from exceeding design capacities during high stages in Pamo "F* Reservoir, Sizes and capacities of the conduit for the various sizes of reservoir are presented in the following tabulation: -llli- Gross reservoir storage capacity, in acre-feet Inside diameter of conduit, in inches Jfeu-imiim design capacity of conduit, in second-feet 90,000 5h 25 135,000 36 29 163,400 38 3h Design of conveyance facilities was preliminary in nature, and prior to preparation of construction plans and specifications, detailed field surveys, subsurface exploration, and soil testing will be requiredo Presented in Appendix K are pertinent data with respect to the features and capital and annual costs of the conveyance facilities considered for Pamo "B" Dam and Reservoir a Alignment of the conduit between Pamo "B" and Mirajnar Reservoirs is shown on Plate 17» Operatioh of Sutherland Reservoir wovild affect the yield from Pajno "B" Reservoir, which in turn would modify yields from San Pasqual ground water basin and Hodges Resejrvoir. In order to reduce the volume of spill and waste to the ocean from Hodges Reservoir, it was concluded that the coordinated use of all reservoirs on a combined safe yield basis would be the most realistic operation and achieve the greatest system yield« To reduce the discharge to the ocean from the San Dieguito River to the greatest practicable degree requires the maintenance of as much available storage capacity in Hodges Reservoir as possible. The proposed operation of existing s\irface storage developments and the Pamo "B" Reservoir assumes that the combined safe yield of the reservoir system would be applied first as a draft on Hodges Reservoir until either the dead storage level was attained or the demand exceeded diversion capacity. =115' and then the cc3rabi:aed yield -^-nvlLd be applied as a d.~'af t on Sutherland /and Pamo "B" Reservoirs in accordance with a balanced storage concept. « Diversions from Hodges Reservoir would taie place whenever necessary to maintain dead storage lex'-el. ^ The balanced storage concept is defined as the reservoir operation under which available resej-voir storage capacity in the system is maintained in proportion to the mean seasonal runoff above the dam. Use of this criterion redxxc;?; •«.)i(-' possibility of one reservoir in a system spilling, especially one located at a love;:.' ele\"ation, while storage space exists in other resei'voirs. Under the oomibined. saftj jrLeld operation;, the anniial system draft is the same evez.'y year^, and the system draft for any particular month is based on average monthly distribat.ion cf seasonal i-jcoan demand by the City of San Diego and is the same as tne system draft for that month in any year. However, drafts on individual reservoirs would vary from month to month and year to year^, depending on storage conditions. The safe system yield for each of the three sizes of reservoir at the Pamo "B" site was determined by electronic m£\chine computing methods, Tb.e results of the operation study, for the period 19l4''3,5 through l95c-57, are set forth in Table 23. -116- TABLE 23 TOTAL AMD ADDITIONAL COMBINED SAFE SEASONAL. SYSTEM YIEIJDS WITE PAMO "B" RESERVOIR FOR THE PERIOD 1914-15 T'HROUGH 1956-57^ In Acre-Feet Pamo "B" Resejrvoir storage capacity Averrage seasonal drai't Sutherlajid ! Reservoir, ; with spillway: gates ^ witli ; capacity of ; 37A30 : acre-feet ; Hodges :Paino "B" Reservoir : Reservoir with : with capacity :indicate4 of 33,550: capacity acre-feet : : Net combined safe ; seasonal yield of the b : Additional ;coi!ibined safe seasonal ; system yield ; creditable to ; Pano "B". system ; Reservoir " 90,000 3,600 8,700 400 12, 700 3,90c 135,000 5,400 8,400 1,300 15,100 6,300 163,400 6,600 8,100 2,000 16,700 7,900 System consists of Sutherland Reservoir with spillway gates and Hodges and Pamo "B" Reservoirs operated coordinately assuming present land and water use in San Pasq.ual-Main Lake Hodges Basin, Assumes releases from Pamo"B" Reservoir to maintain groun.d water levels in Saxi Pasqual-Main LaJie Hodges Basin equal to those which would have prevailed with Sutherlajid and Hodges Reservoirs operated coordinately on a combined saife yield basis. -117= San PagqugJ. Bam^ Reservoir, and Conveyance Systeni o The San Pasqiial Dam site is located on the San Dieguito River, southeast of the City of Escondido at the western end of San Pasqual Velley in Section 1, T, 13 S,, R. 2 W,, S, B, B. & M, Stream bed elevation at the dam site is 333 feet. United States Geological Siarvey datum. The drainage area above the dam site is 2h9 square miles, of which $k square miles lie above e:d.sting Sutherland Dam, Mean seasonal runoff at San Pasqual Dam site is estimated to be 3U,600 acre-feet during the U3-year period, ^^ I9IU-I5 through 195'6-57, including spills from Sutherland Reservoir with that facility operated coordinately with existing Hodges Reservoir on a combined safe yield basis. Estimated net seasons!, depth of evaporation at San Pasqual Reservoir site for this period is 3o2U feet. Designs for tlie various sizes of dam considered at the San Pasqual site are based on topographic maps preparced ay the State Department of Water Resources in 1957 at a scale of one inch equals 200 feet with a contour interval of 10 feet. Reservoir areas and capacities a.t various water surface elevations, estimated from United States Geological Stirvey maps at a sccJ-e of lt2ii,000 with a 10-foot and 20-foot contour interval, are presented in Table 2U. -118- TABLE 2li AREAS AND CAPACITIES OF SAN PASQUAL RESERVOIR Water surface elevation, s Depth of water ! Water surface s Storage capacity, U.S. G. So datum. s at dam, area. % in acre-feet in feet ; in feet in acres 333 «■ ^^ and sec-- tion of the 157-foot high dam are shown on Plate 19. -125= TABLE 25 GEHERAL FEATURES OF THREE SIZES OF DAM AMD RESERVOIR AT THE SAN PASQUAL SITE OK SAK DIEGUITO RIVER GU yxec'seristles of Site , i&?aj.>..iage a:rea — 2k9 square miles JirALynxgii area beilow Sutherland Dam--195 aquare miles Estluiitsd. average seasonal runoff below Sutherland Dam — 23,100 acre-feet Estimated average net seasonal depth of evaporation — 3*24 feet Estimated sedimentation— 2, 400 acre-feet average for UO-year amortization period Elevation of stream, bed, U.S.G.S. datum — 333 feet Eertbg^i ll Dam C::est elevation, in feet, U.S.G.S. Ores-:.-, length, in feet Crejst trLdth, in feet Zeiijht, spillvaj' lip above stream bed, in feet Sirx slopes, Tipstream and dovmstream FreeboaL'd, above spillway lip, in feet Voltuae of fill, in cubic yards Rese rvoir SurfLoe area at spillway lip, in acres lei. storage capacity at spillway lip, in e,cre-feet Ty??© of spi3_lway Si'iliway discliarge capacity, in second-feet Type of outlet Adcy.tional safe seasonal yield to the City of San Diego from the system, due to Sej3 Pasqual Reservoir, in acre-feet° Txcrejaental safe seasonal yield from the system due to San Pasqual Reservoir, in acre-f eet° : Gross res srvoir sxorage in acre-feet^ capaci-cy. : 137,000 : 257,000 : 372,000 1^33 465, 490. 4,190^ 1,W) 2,745^ 30 30 30 80 113 137 3:1 3:1 3:1 20 19, 20 2,670,000 4,341,000° 6,481,000° 2,920 4,360 5,050 97,600 217,600 332,600 Ogee weir with concrete chute 123,330 115,600 111,800 48-inch 66-inch Two 60-inch diameter diameter diameter steel pipe steel pipe steel pipes 8,300 13,800 5,500 18,600 4,800 -126- G-EJiERAL FEATURES OF THREE SIZES OF DAM AM) RESERVOIR AT THE SAK PASQUAL SITE OK SAN DIEGUITO RIVER (continued) CapitaJ. Cc^ts Dam and reservoir, including groxuad water development Per acre-foot of storage Par acre -foot of additional net safe seasonal yield from tlie system An.nugl Costs Dam and reservoir;, including groiind water development Per acre-foot of additional net safe seasonal yield from the system Per acre-foot of incremental net safe yield from the system Gross reser/oir storage capacity ;, in acre-feet^ 137,000 ; 2^7,000 ; 372^000 $1U,19U.300 $17,163,700 $20,807,900 loii 67 56 1,710 1,244 1,119 $ 613,000 $ 827,200 $ 1,004,700 82 60 54 39 37 a. Includes 37^000 acre-feet of ground water storage underlying the reservoir area. General featiires for developing ground water storage underlying the reservoir area are presented in Table 26. "b. Includes auxiliary dams. c. System consists of San Pasqual Reservoir and development of ground water underlying the reservoir ai-ea operated coordinately with Sutherland Reservoir with spillway gates and Hodges Reservoiro -127- TABLE 26 GEMERAL FEATURES OF WELLS, PUMPING PLAMTS, AND CONVEYANCE FACILITIES FOR GROUND WATER DEVELOPMENT WITHIN SAN PASQUAL RESERVOIR AREA Project Facilities a ^ ; Number of l6-inch diameter gravel-packed wells to be constructed . o 13 Average depth of new wells, in feet ., ..o ....... . I80 Avereige yield per new wel!!., in gallons per minute ....... 750 Jfotor horse power to operate submersible puraps ....... 30 and 50 Length of pipe lines^ in feet lO-inch 6,300 .i.O°^XXlClX eeo*«c»«9eo«ee«0**«eeoo« -L^ ^\J\J 20-inch ........................ 2, 5OO Capital Costs Wells, ptoniping equipment, pipe lines $795;i600 Per acre-foot of 37^000 acre-feet of usable ground water storage with maxiratan average ground water ^ level lowering of 80 feat ................. 22 * Land and improvement costs not included. -128- The yield from San Pasqual Reservoir would be conveyed through a reinforced-concrete steel cylinder pipe line^ with an initial elevation of 3U0 feet, to a point one mile downstream from the dam, where a portion of the yield would be discharged through a gate valve into a three and one-half mile long canalo This canal would extend along the south side of San Dieguito River to Lake Hodges ^ terminating at a point northwest of Battle Mountain at an elevation of 317 feet« The remaining portion of the yield would be pumped through a 12 -mile long reinforced-concrete steel cylinder pipe line to proposed Miramar Damj, which will have a spillway lip elevation of 710 feeto A gravel access road woiold be constructed along the north side of the canalo Pipe line and canal alignment were chosen after an examination of the topography of the area, as shown on United States Geological Survey maps at a scale of ls2iii,000 and a contour interval of 20 faet^ and is shown on Plate 17 o The piamping plant would be located at the southeastern edge of Lake Hodges Basin at an elevation of 3iiO feet. The pumping plant for the largest size reservoir considered^ including maxim-um utilization of the ground water within the reservoir area, would have an installed capacity of 2^000 horsepowero From the pumping plant, the pipe line would continue south about 3. ,000 feet to a poxnt between Indian and Bernardo Canyons „ at an elevation of 720 feet. From this location^ the conduit alignment between San Pasqual and Miramar Reservoirs becomes the same as the gravity conduit from Pamo Reservoir^ previously described. High pressure pipe would be used for the crossings of Bernardo Canyonj Green Valley j, and Los Penasquitos Ganyon„ and at other locations necessary. Pipe line sizes and capacities would vary in accordance with the majd.-= mum monthly draft for the three sizes of San Pasqual Resei^oir consideredo ^129- Releases would be made to Lake Hodges in accordance with the demand schediile of the service area of the reservoir. Sizes and capacities of the conduit for the various sizes of reservoir are set forth in the following tabulations Conveyance facilities Surface and Pipe line Capacity of canal, from ground water reseirs'oir San Pas< to pximp; Inside diameter 5 in inches 36 UO ^ual Dam Lng plant Capacity in second- feet Pumping Miramar plant to Reservoir pumping plant to storage capacity 3 in acre-feet Inside diameter 5 in inches 22 30 36 Capacity in second- feet 8 18 29 Lake Hodges, in second-feet 13 7.0 000 257,000 372,000 30 UO 52 22 22 22 Capital and annual costs of uhe conveyance facilities for reservoirs considered at the San Pasqual site or. the San Dieguito River are presented in Appendix Ko The cost of electrical energy for the pumping plant was based on average levels in San Pasqual Reservoir orrring the period 191U-15 through 1956-57. Estimates of yield from resenroirs considered at the San Pasqual site were based on the previously discussed combined safe yield operation. The safe jrield of the reservoir system would first be applied as a draft on Hodges Reservoir alone until its storage was depleted, then the combined yield would be applied as a draft on Sutherland and San Pasqual Reservoirs in accordance with the balanced storage concept., Diversions from Hodges Reservoir would continue to take place whenever necessary to maintain the dead storage level. Total and additional combined safe seasonal system yields and average seasonal drafts on existing Sutherland, Hodges, and San Pasqual Reservoirs, for each of the three sizes of reservoir considered at the San Pasqual site, -130- including yield from San Pasqual Basin, for the period 1914-15 through 1956-57* are presented in Table 27 o TABLE 27 TOTAL AMD ADDITIONAL COMBINED SAFE SEASONAL SYSTEM YIELDS WITH SAN PASQUAL RESERVOIR FOR THE PERIOD 1914-15 THROUGH 1956-57^ In Acre-Feet : Average seasonal draft : Net combined safe seasonal yield of the system San Pasqual Reservoir stdrage capacity^ : Sutherland : Reservoir, :with spillway : gates, with : capacity of : 37,430 : acre-feet : : Saji : : Hodges : PasquaJ. ; : Reservoir.- : Reservoir : : with : with : : capacity: indicated: :of 33,500: capacity : : acre-feet : , : : Additional : combined safe : seasonal : system yield : creditable to : San Pasqual . : Reservoir 137,000 6,300 7,400 3,400 17,100 8,300 257,000 9,300 5,600 7,700 22,600 13,800 372,000 11,500 3,100 12,800 27,400 18,600 a. System consists of Sutherland Reservoir with spillway gates and Hodges ajid San Pasqual Reservoirs operated coordinately, including development of ground water linderlylng San Pasqual .Reservoir area. b. Includes 37,000 acre-feet of ground water storage capacity underlying Saji Pasq-ual Reservoir area. Super Hodges Dam, Reservoir, and Conveyance System . Super Hodges Dam site is approximately I50 feet downstream from existing Hodges Dam. Stream bed elevation at the dam site is 200 feet. United States Geological Survey datum. The drainage area above the site comprises 302 square miles, of which 54 square miles lie above existing Sutherland Dam. ^fean seasonal ronoff into existing Hodges Reservoir is estimated to be 38,700 acre-feet during the period from 1914-15 through 1956-57, including spills from Sutherland Reservoir, with that -131- facility operated coordinately with existing Hodges Reservoir on a combined safe yield basis and assuming present conditions of land and water use in San Pasqual- Main Lake Hodges Basin, Estimated net seasonal depth of evaporation for this period is 2,79 feet. A topographic map prepared by the City of San Diego in 19ii2 and revised in I9I4.6 was used for dam site studies. Reservoir area and capacity relationships were taken from data presented in Bulletin No. 55 and from a topographic map prepared by photogrammetric methods to a scale of one inch equals UOO feet. The contoiir interval of this map is 10 feet. Deposition of silt in existing Hodges Reservoir was considered in estimating reservoir areas and capacities. The reservoir data is given in Table 28, -132- TABLE 28 AREAS AND CAPACITIES OF SUPER HODGES RESERVOIR Water surface g » • -• elevation ; Depth of water s Water surface r Storage capacity. UoSoGoSo datum. t at danij t area, s in in feet t in feet t in acres : acre-=feet 220 1 1 1 230 11 8 UO 2U0 21 27 207 250 31 87 7U5 260 Ul 177 2,035 270 51 25U UslSO 280 61 382 7o3l;0 290 71 5i;5 11,950 300 81 778 18,530 310 91 1,075 27,780 320 101 1^05 Uo.liiO 330 m 1,951 56,920 3U0 121 2,396 78,660 350 131 2.799 1014,630 360 li4l 3,710 13 7 180 365 1U6 U,056 157,300 370 151 ii.liOl 177,730 380 161 5;oU6 22h,960 390 171 5,767 279,030 395 176 6,189 310,000 Uoo 181 6,610 3li0„920 U03 18U 6,859 365,000 The geology of the dam site was described in considerable detail in Bulletin No» 55.. The more important of these comments are given belowt "The area in the vicinity of the dam site contains a series of old volcanics and sediments that have been intruded by granitic material and have been metamorphosed to varying degrees » No major faults were noted in the area, but shearing and minor faxilting are found at many localities. This general area is considered to be seismically active o .133=. "Rocks at the proposed dam site appear to be meta-volcanics, with the more basic rocks in the left abutment and channel sections giving way to a more acid type on the upper right abutment. Consideirable of the rock in the present spillway area is a meta- rhyolite eind moi*e of this rock is found at higher elevations, both upstream and downstream from the site. Practically all of the rock;, when frashly exposed, is hard and durable and capable of carirying the load of the dams being considered. "All the foundation rock at the site is strongly Jointed. Some local crushing and shearing is noted and gougy seams axe found in the more weatbf^^red upper portions. The most notable set of joints is on the right abutoent where a dip of 25 to kO degrees toward the Channel is joined. These joints cut the rock into slabs, five to ten feit in thickness, aiid produce Ljliding planes that may require some special consideration. A nearly vertical joint system parallel to the channel is also quite pronounced. There is a set of stream- ward dipping joints on the left abutnwnt, quite similar in nature to the set on the right abutment. It was obsearved in the road cuts brlow the zone of vreathering (approximately 30 feet normal to the 3'.):.'face) that the joints were tight-31- and' cleaner and it appears that they cou].d be properly treated by washing and gL-outing. "A strong shear zone exists on the ri^t abutment at elevation 325. It strikes approximately N. ''(?." E. and dips into ,the abutment approximately 40 degrees. It extends ups-crdam under the existing spillway apron and downstream beyond the limits of the location considered for a fcture dam. Jfeterial in the zone appears to be soft light colored ti^ffaceous material and may have developed from crushing of the meta-rhyolite . This material may improve with depth, but it should be considered a zone of weaJmess and accorded special treatment. This shear zone is about 25 feet in thickness 'sind has been eroded to depths of ovist 20 feet by water flowing over the existing splLlwai''." In 1949, the United States Amjy Corps of Engineers made seven core borings at the dam site. . One hole Tas lociated on the left abutment, two in the stream charmelj and four on the right abuteente These holes ranged in depth from 33.7 feet to l4l.8 feet, with a total footage of 432.8 feet. Of this total footage, I8.6 feet were in overburden and 4l4.2 feet were core drilled in rock. Location and logs of the holes are shown in the Corps of Engineers' report entitled "j^pendixes to Accompany Report on Survey, Flood Control, San Dieguito River, San Diego Covinty, California", dated Jferch 1, 1956. Location of the holes are also shown on Plate 20. -13U- Previous geologic studies , augmented by more recent surveys 5 indicate that the Super Hodges Dam site is suitable for construction of concrete gravity, rockfills or earth fill dams up to a height of about 220 feet above stream bed. In order to reduce waste to the ocean to the greatest practicable extent., a dam with a height of 220 feet above stream bed was found to be the optimvim struc- ture , Economic considerations indicated that dams with heights of I8U feet and 213 feet should also be consideredo Reconnaissance of the area in the vicinity of Super Hodges Reservoir and Dam site indicated that rock materials were available in siifficient quantities for construction of a rockfill dam with a height of 220 feeto Pre= liminary designs and cost estimates were prepared for rockfill and concrete gravity dams of this heighto The previous investigation,, reported in Bulle= tin Noo 5$r considered only a concrete gravity structure at this site. On the basis of very preliminary cost comparisons ^ it appeared that the cost of a rockfill dam^ with a side channel spillway at the right abutment immediately adjacent to the dam fill 5 would be in the same order of magnitude as the cost of a concrete gravity dam,, However, no informa- tion was available regarding the quality of the available rock,, and the costs of quarryingy haulingj, and placing rock and maintaining the upstream imper= vious face of the dam were somewhat speculative in nature » Consequently, cost estimates were based on preliminary designs of three sizes of concrete gravity dam at the Super Hodges site. Designs,, with the possible exception of outlet works, closely approximate plans shown in Bulletin No. 55 and in the United States Army Corps of Engineers' "Report on Survey, Flood Control, San Dieguito River, -135- San Diego County, California", dated March 1, 1956. Estimates of costs sure based on a vertical upstream face and a downstream slope of 0.8 horizontal to 1.0 vertical. Width of dam crest would be 15 feet. This would provide for a single-lane roadway ;, carried over the spillway by a reinforced concrete bridge. It was also assumed that concrete aggregate would be obtained from POirey Valley, approximately nine miles southeast of the Super Hodges Dam Bite. Although this aggregate is considered somewhat reactive, the adverse effects will be greatly reduced when combined with low alkali cement and other appropriate admixtui*es. This source of aggregate has been utilized successfully in construction of Sutherland Dam. On the basis of geological reconnaissance, it was estimated that stripping in the stream channel to depths of 15 feet would be required. Stripping from the right abutment in the shear zone would be about 85 feet, while stripping elsewhere from the right abutment would be approximately 20 feet. Stripping from the steep left abutment would be in the order of 15 feet. It was recommended, by the United States Army Corps of Engineers, that foundation rock in both abutments and between abutments be grouted, with the amount of cement required probably not exceeding one-half sack per linear foot of grout hole. The estimated peak flow of a once-in-100-year flood and a once- in-1, 000-year flood at Super Hodges Dam site is 88,U00 second -feet and 163,200 second -feet, respectively. Reduction of a once-in-100-year flood followed three days later by a once-in-1, 000-year flood for various sizes of dam and reservoir is shown in the following tabulation: -136- Height of dam crest above stream bed, in feet Gross reservoir storage capacity J in acre=feet 157,300 310,000 365,000 Peak inflow of a once- 100-year floodj in second=feet 883I4OO 88,i;00 88,liOO Peak inflow of a once- ia- l,000=year flood, in second -feet 163,200 163,200 163,200 Peak spillway discharge, in second-feet 115,000 102,000 92,800 Maximum head on spillway, in feet 18U 213 220 18 17 16 A one-foot residual freeboard between the maximum water surface at flood stage and the dam crest was assumed in the design of all three dams„ An ogee overflow spillway, with a net length of UOO feet, woiild be located over the middle section of the damo A deflecting lip or bucket woiild be provided near the downstream toec The spillway would be divided by training walls into two central sections with widths of 100 feet and 200 feet, respectively, and end sections with widths of 50 feet each. Spillway gates were not included in the estimate. Outlet works would be located near the right abutment of the dam. In- take conduits for the outlet works would be located at five levels,, 28 feet apart for the two larger dams and at four levels p 25 feet apart, for the I8U- foot high dam. These conduits would extend from the upstream face into the dam to a vertical well. Trash racks are provided on the face of the dam at each intake, and gate valves control the flow in the intake conduits. The main outlet conduit consists of a welded steel pipe extending from the bottom of the vertical well to a control valve house located about 1;00 feet downstream from the dam where a bifurcation structure would direct the water to either the existing conduit to San Dieguito Reservoir or to a pipe line to the proposed Miramar Reservoir, A needle valve would be provided in the valve house to control flows to San Dieguito Reservoir, vrtiile a gate valve would control flows to Miramar Reservoir, Intake conduits j vertical well. =137' and main outlet pipe line are 30 inches, k2 inches, and kd inches in diameter for the l84"foot, 213-foot, and 220~foot high diams, respectively. Cost estimates include provision for a four by five-foot i^ctangular concrete sluicing outlet near the base in the center of the two larger dams. A three "by four-foot condiilt is provided in the smaller structures. A trash rack woTild be provided at the intake of the sliiicing outlet and flow therein woTild be controlled by two emergency slide gates in tandem. The l84-foot high concrete gravity dam could be constructed in about two years, while the two larger dams would, probably require three years to coirplete. Normal flows in the San Diegulto River would be impounded in existing Lake Hodges during construction. A low point would be maintained near the center of the prospective dam during concrete placement to accommodate spills from existing Lake Hodges. The City of San Diego owns the land on which Super Hodges Dam site is located and most of that portion of the reservoir area below an elevation of 395 feet. The value of City and privetely-owned lands and improvements required for the project were estimated by appraisers of the State Department of Water Resotirces. Acreage and the number of privately-owned parcels that would be acquired for the three sizes of reservoir are presented in the following tabxilation: Area wlthiri dam an 79 feet Estimated sedmentation— 3,000 acre-feet, average for i;0-year amortization period Elevation of stream bed, UoS»GoSo datum—200 feet tGross reservoir storage capacity, t in acre-feet 157,300 t 310^000 365 n 000 Concrete Gravity Dam Crest elevation, in feet, U.SoGoS, Crest lengthy in feet Crest widthy in feet Height, spillway lip above stream bed, in feet Side slopes p upstream and downstream Freeboard, above spillway lipj, in feet Volume of mass concrete, in cubic yards 38U a3 880 975 15 15 U20 isOU5 15 165 195 203 Vertical and 0,8sl<,0 19 18 17 293,000 Uo7,ooo U55sOOO Reservoir Surface area at spillway lip, in acres Net storage capacity at spillway lip, in acre-feet Type of spillway Spillway discharge capacity c, in second-feet Type of outlet Additional safe seasonal yield to the City of San Diego from the system due to Super Hodges Reservoir, in acre-feet^ Incremental safe seasonal yield from the system due to Super Hodges Reservoir, in acre=feet^ h,056 6,189 6,859 15U,300 307,000 362,000 Standard ogee weir, overflow type 115,000 102,000 92,800 30'=inch U2=inch U8=inch diameter diameter diameter steel pipe steel pipe steel pipe U„200 11,200 7,000 13,700 2,500 -iia- GENERAL FEATURES OF THREE SIZES OF DAM AND RESERVOIR AT THE SUPER HOCOfiS SITE ON SAN DIEGUITO RIVER (continued) Capital Costs Dam and reservoir Per acre-foot of storage Per acre-foot of additional net safe seasonal yield Annual Costs Dam and reservoir Per acre-foot of additional net safe seasonal yield from the system Per acre-foot of incremental net safe seasonal yield from the system Gross reservoir storage capacity, in acre-feet 157,300 ; 310,000 t 365,000" $19,120,700 $32,U35,U0O $35,339,900 122 105 97 U,553 2,896 2,580 $911,300 $l,5Ui,ooo $l,683,Uoo 217 138 123 90 56 System consists of Sutherland Reservoir with spillway gates and Super Hodges Reservoir operated coordinately, assuming present land and water use in San Pasqual-Main Lake Hodgps Basin for the area not inundated by Super Hodges Reservoir, -1U2- It was assumed that the conveyance facility from existing Hodges Reservoir to San Dieguito Reservoir would be utilized if Super Hodges Dam were constructed,, The increase in yield resulting from a development at the Super Hodges site, however^ would necessitate construction of two pumping plants and a lO-raile reinforced concrete steel cylinder pipe line from Super Hodges Reservoir, at initial elevation of 220 feetj, to the proposed Miramar Reservoir., having a water sxirface elevation at the spillway lip of 710 feeto United States Geological Survey topographic maps were used in selecting the conduit alignment, shown on Plate 17 » The conduit from Super Hodges dam site would cross the San Dieguito River in a buried siphon approximately 500 feet downstream from the toe of the dam and would extend downstream along the south edge of the San Dieguito River a distance of approximately 3..)000 feetj from which point it would ex- tend southerly about 1,300 feet to Pumping Plant Noo 1 at an elevation of 220 feeto From Pumping Plant NOo 1, the pipe line woiild continue in a gener- al southerly direction approximately three miles to Pumping Plant No„ 2j located on the south side of La Jolla Valley at sin elevation of about 535 feeto The conduit would then extend southerly from the pumping plant, cross- ing Los Penasquitos Creek approximately one mile west of U. S„ Highway No„ 395, to a point about 3,000 feet south of Los Penasquitos Creek„ From this point, the conduit would extend in a southeasterly direction about two miles to Mira- mar Reservoir o High pressure pipe would be used where needed on the discharge side of the pumping plants and across La Jolla Valley and Los Penasquitos Canyon « Pipe lines would vary in size and capacity in accordance with the maximum monthly flow, which, in turn, would depend upon the reservoir capacity« „1U3= Releases would be made to San Dieguito Reservoir in accordance with the demand schedule of the sei*vlce area. These releases, however j woiild not exceed the 17 second-foot capacity of the existing conduit from Lake Hodges to San Dieguito Reservoir. Sizes and capacities of the Super Hodges -ffi.ramar conduit for the three sizes of reservoir considered at the Super Hodges site are presented in the following tabulations Gross reservoir storage capacity, in acre-feet Inside diameter of conduit, in inches Design capacity of conduit, in second-feet 157<,300 20 6,3 310 J 000 26 13.5 365,000 28 18.0 Capital and annual costs of the conveyance facilities considered for developments at the Super Hodges site are presented in Appendix K. The cost of electrical energy for the pumping plants was based on average levels in Super Hodges Reservoir during the period 191i;"l5 through 1956-57. Estimates of yield from reservoirs considered at the Super Hodges site were based on a combined safe yield operation. However, when a develop- ment at the Super Hodges site is substituted for the existing Hodges Dam, the reservoir system within the watershed would be operated in a different manner than with prospective works at the Pamo "B" and San Pasqual sites. If the system yield was first applied as a draft on Super Hodges Reservoir alone until its storage was depleted, a portion of the supply stored in Sutherland Reservoir would spill. Operation of Super Hodges and Sutherland Reservoirs on the basis of balanced storage was selected as the most feasible plan of system operation. -1UU= Total and additionaJ. combined safe seasonal system yields and aver- age seasonal drafts on Sutherland and Super Hodges reservoirs for each of the three sizes of reservoir considered at the Super Hodges site for the period 191ii"l5 through 1956-57 are presented in Table 30, TABI£ 30 TOTAL AND ADDITIONAL COMBINED SAFE SEASONAL SYSTEM YIELDS WITH SUPER HODGES RESERVOIR FOR THE PERIOD 1914-15 THROUGH 1956-57^ In Acre-Feet i Average seasonal draf t~ ~ s Additional Super Hodges sSutherland Reser- g ; Net combined § combined safe Reservoir :voir with spillway? Super Hodges ssafe seasonal sseasonal yield storage ; gates with s Reservoir with % yield of the ; creditable to capacity i capacity of sindicated capacity? system t Super Hodges t 37j,ii30 aere-feet t 157,300 8,500 310 p 000 10,900 365 s 000 n.hoo t Reservoir iip5oo 13., 000 U,200 9pioo 20^000 11,200 11 3 100 22,500 13,700 ao System consists of Sutherland Reservoir with spillway gates and Super Hodges Reservoir operated coordinatelyp assuming present lar^d and water use in that portion of San Pasqual-Main Lake Hodges Basin not inundated by Super Hodges Reservoiro -1U5- San Vicente Reservoir . As previously mentioned in this chapter, a considerable amount of water would spill frcm both Sutherland and Hodges Res- ervoirs and waste to the ocean under a combined ssife yield operation. Storage is available in the City of San Diego' s San Vicente Reservoir to regulate diversions from Sutherland Reservoir _, during such periods of spill, in excess of the amount diverted under a combined safe yield operation. The existing San Vicente Dam is a straight concrete gravity struc- ture with central overpour spillway. It is 190 feet in height from stream bed to spillway crest, has a ctest length of 980 feet, and creates a reser- voir with a storage capacity of 90,200 acre-feet. Elevation of the spillway lip of the dam is 650 feet. It is estimated that 5,300 acre-feet of storage is available in San Vicente Reservoir to regulate spills diverted from Sutherland Reservoir. This estimate is based on the following assumptions regarding water supply? 1, The estimated mean seasonal natural runoff from the drainage area above San Vicente Reservoir is 7,800 acre-feet. 2, The estimated seasonal import of 75,li50 acre-feet req\iired in the City of San Diego' s Alvarado Service Area in 1975 would be supplied from the First San Diego Aqueduct and regulated to a demand basis in San Vicente Reservoir. 3, The City's safe seasonal draft from San Vicente Reservoir would be 80,000 acre-feet in 1975, including imported water but excluding waters diverted from Sutherland Reservoir. Spill salvaged from Sutherland Reservoir and conveyed to San Vicente Reservoir at times when downstream reservoirs were not spilling B«ll^6" would reduce yields from downstream developments . For this reason^ the only water considered available for diversion was the minimum monthly spill from any reservoir in the San Dieguito River watershed, either existing or poten= tial, or the unused conveyance capacity of the Sutherland-San Vicente conduit, whichever was the least value o The amount of spills available for diversion decreases as storage is increased in the San Dieguito River watershed . Table 31 lists the average annusQ. spills diverted to San Vicente Reservoir and the total additional combined safe system yield of the San Dieguito River watershed and the drainage area above San Vicente Reservoir for both existing and potential plans of development , utilizing 5,300 acre-feet of storage in San Vicente Reservoir for regulation of spills from Sutherland Reservoir. Only the most promising plans for development in the San Dieguito River watershed were analyzed under coordinate operation with San Vicente Reservoir. 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However y \inder the method of operation in which a portion of the spills are salvaged and diverted to San Vicente Reservoir^ the total combined safe seasonal yield from existing facilities., considering only water from the San Dieguito River watershed^ can be increased by about 900 acre-feet as shown in Table 31" Although the total combined safe seasonal yield from existing and potential developments increases as the total storage capacity is in- creased in the San Dieguito River watershed, the volimie of spills available for transfer and the resulting yield decrease. This condition results in the additional combined safe seasonal yield from potential developments when considering transfer of spills being somewhat less than the additional yields derived without transfer of spills » In the comparison of plans of siirface storage developments described in Chapter Yl^ it was assimied that an opera- tion would be employed which involved the transfer, to San Vicente Reser- voirs, of a portion of the water which would have spilled from Sutherland Reservoir, Under most of the plans of development considered,, a portion of the spills which are available for transfer to San Vicente Reservoir would in turn spill from the latter reservoir xmless either the purchase of im^ ported water was reduced or the storage capacity of San Vicente Reservoir was increased. If the City reduced the purchase of imported water in order to conserve more local water,, a monetary benefit would accrue to the City, -1U9= Table 32 presents the additional quantities of local water >diich could be conserved with maximum possible diversion of spills from Suther- land Reservoir and reduction in deliveries of imported water to San Vicente Reservoir for both existing and potential plans of development. The mone- tary benefits accruing to the City of San Diego as a result of reduction in purchases of imported water, computed at the current rate of $17.00 per acre-foot, is also shown. -150- CV) OCX, w fo Eh Sg Eh H CO O o o M M C>4 s r~- O P-, XA O I eg J vo w M lA S ^ H f^ CO w 0) ^^ J 0) MH nj -H u cd CO -P ch ^ P3 0) a> e > a §g g 0) ft O Q) Q) m o 0) O cd Q.-P 3. -c! W cfl tfl S ,Q <+-! 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X x: LTN 01 P •p ^ P 3 3 ■> d en en efN -f t^ c c X3 3 01 01 u 01 01 ^ X3 p p .3 § d 60 • c & r-( rH 0) >> 01 >. • •H +» d d d d ^§ » PQ 3 "> rH rH 1. 60 0] r^ 0) rH d C 0) -rH G) ^ 3 W Cd P-H o ■p w o J 00c o tn c c 2; < i-i h-t -155- CilA-t-TER V, FLOOD CONTROL The large floods of I916, 1927, and 1937 caused extensive damage in the San Dieguito River watershed » Shonuld a large flood occur under present conditions, the resnnltant dauaage would be several tines greater than that caused by past floods tof siufilair ajg^gnltwcle due to the large increase in the number and value of iuiproveaients in the overflow areas, i)articuleu:ly in San Dieguito Valley c In the upper aad cea'i.-cal parts of the San Dieguito River watershed, principally ia San Pasqwel Valley, floods cause damage to agricultural lands and scattered iaiprc'^'esasatE aloag the prini?ipal stTcaais, In San Dieguito Valley, the part of the watei-shed me^irest the coast, industrial and residential property is susceptilile to flood damage o Am airport, the facilities of the Tweaty=secoEd Agricultnival District need by the San Diego County Fair Association and the Del Mar Ta3"f Cluto^ aad about 150 expensive beach hones axe located in the coastal aiea. Prior flood control investigations, and criteria used to estimate flood control benefits from operation of large water conservation reservoirs, axe discussed first in this chapter, followed by a comparison of flood control accomplishments for the largest size of each of the reservoirs considered. Prior Flood Control Investigations The need for flood control measui'es on all streams flowing into the Pacific Ocean in San Diego County was recogjiized by the Congress in 19^1; when it authorized studies for the determination of flood control requirements on these streams. As a result of this and subsequent legislation, the United States -156- Army Corps of Engineers prepared a "Report on Survey, Flood Control, San Dieguito River, San Diego Councy, California", dated I4arch 1, 1956, submitted to Congress on November 20, 1957- It was rdriommended that the United States pay a share of the cost of a large locally-owned exid sponsored multiple-pur- pose dam at the Hodges site. The dam would create a reservoir with a total storage capacity of 3T5,'000 acre-feet, of which 85,000 acre-feet would be reserved for flood control, 28o,000 acre- feet for water conservation, and 10,000 acre- feet for sedimentation. The reservoir would produce a substantial additional annual yield of water and would prevent most flood damage in the San Dieguito Valley. The average annual benefits from flood control were estimated at Sl86,000. On July 3; 1958, the 85th Congress, through enactment of Pablic Uiv 85-500, authorized the project described in the survey report at an esti- mated federal cost of ol, 961,000. The State study, reported in Bulletin Ho. 55? recoiranended that a 310,000 acre- foot water conservation reservoir be constructed at the Hodges site to be operated in conjunction with the proposed Butherlsjid Reservoir. ith ruspect to flood control on the San Dieguito River, the report included the following recommendation: "... that Federal assistance be scmght in construction of an enlarged Hodges dam and conservation reservoir, on the basis and to t.he eztent of resultant reduction in downstream flood danages." Plans for water development in San Dieguito River watershed may include construction of large dams wjid reservoirs at other thim the Super Hodges site. It is appaj-ent that certain flood control benefits would accrue from use of these reservoirs even when operated exclusively for water conserva- tion. Flood control benefits were estimated as part of this investigation for dams and reservoirs at the Pajno "B", San Fasoual, and Super Hodges site as an ■157- aid it), the final choice of a plan of developrae.it and to indicate the generail order of magnitude of the beiiefrVts which would be realised. Criteria fo r Ifete -T nining: iJ'lo o d Control Accomplishments Flood control accoiirplishme:.'.ts were evaluated only for the largest conservation reservoir considered at the Ppjno "3", Sem Pasqual, and Super Hodges sites. No reservation of flood cyjr'ysol storage is proposed in any of the striietures coI^aidered., nor has the neeo. for stream channel improvement been evaluated. To facilitate the determination of the magnitude and occurrence of flood flows, hydrograrphs of flood floi-rs on t?:ie ma;".n stsream and its princi- pal tributary, Santa Ysabel Creek, developed during the investigation reported in Bulletin Uo. 55^ were utili/ed in this investigation. These hydrographs are considered to still be applicable inasmuch as no large floods have occ:xrred since publication of Bulletin No. 55 in 19^9- Bulletin No. 55 also contained considerable inform£5,tion on flood frequencies. Data on magni- tudes and frequencies of floods of the San Dieguito River used in this in- vestigation wei-e taken, from that report. Reduction of peak dischar(2;es by operation of existing Sutherland Reser\'-oir were considered to be negligible; reduction of discharges by existing Hodges Reservoir, considering surcharge storage above spillway crest, was considered only for the purpose of evaiuatir.g damages which would occur with existing facilities. The only overflow eireas considered in detail were those in the San Dieguito and San Pasqual Valleys. The type and estimated value of property and the acreage involved in each of these overflow areas are presented in Table 35. -158- TABLE 35 ESTIMATED AVERAGE V.ALUK OF PROPERTY SUBJECT TO DAMAGE BY MCOI-ITROLLED FLOODS IN KilNCIPAL OVERFLOW AR.EAS. IN SAN DIEGUITO RIVER VJATERSHED FOR THE PERIOD 1958 THROUGH 200?^ Estimated Approximate Estimated average prop- Type of property- area, in 1958 property erty value subject to flood damage in acres value, in 19 58 over next 50 years San Dieguito Valley- Agricultural: (a) Land and improvements 2,068 $1,068,000 $1,1^7,000 (b) Crops (including pasture) b 303,000 552,000 Residential 90 2,080,000 3,120,000 Fairgrounds and racetrack 119 3,700,000 5,550,000 Airport 15 i+00,000 600,000 Industrial 68 125,000 193,000 Vacant urban 18 72,000 36,000 VJells and water systems b 20 U, 000 2^7,000 Highways, streets, and bridges 180 900,000 1,350,000 Railroads and bridges 20 300,000 300,000 Vtilities b 300,000 it 50, 000 Channel improvements b 20,000 31,000 Miscellaneous if22 10,000 10,000 TOTAL 3,000 $9 , ^2 , 000 *13 , 586 , 000 San Pasiual Valley Agricultural: (a) fand and improvements (b) Crops (including pasture) Veils and irrigation systems Highways ajid bridges Utilities Miscellaneous TOTAL 2,000 $1 ,j70,ooo s 1,545.000 c 2i!-0,000 '^80,000 c 150,000 225,000 80 400,000 600,000 c 85,000 128,000 320 20,000 20,000 2,U00 •;'2 ,265,000 $ 2,998,000 a. Based on property ajid flood damage data developed by the United States Army Corps of Engineers . b. Included in other area classifications of San Dieguito Valley over- flow area. c. Included in other area classifications of San Pasqual Valley over- flow area. •159- Basic property and flood damage data for these two areas, developed by the United States Army Corps of Engineers from property appraisals and flood damage surveys and presented in the 1956 report, were revised for use in estimating the damages from future floods. Development in the overflow areas from 1956 through 1958 and estimates of future development during the 50-year period from 1958 through 2007, based on the latest available forecasts on future trends of development, including population forecasts, were con- sidered in making the revisions. Flood control benefits may be defined as the difference between the value of damages that would occur with and without the reservoir projects considered for construction in this report. The damages without each project were assumed to be those damages that would occur with existing Hodges Reservoir in operation and full to spillway crest at the beginning of each flood. The estimated damages that would occur under the operation of either Bamo "B", San Pasqual, or Super Hodges Reservoirs were determined under two conditions of reservoir storage for each structure. One condition assumed that each reservoir would be full to spillway crest at the beginning of the flood period. Under such an operation, outflow from the reservoir would be reduced by surcharge storage above the spillway crest elevation. The second condition was based on the assumption that the storage capacity which remained unused on April 1, 50 per cent of the time, could have been used for flood control purposes earlier in the season. April 1 is considered the end of the flood season, when reservoirs in the watershed would generally have a minimum amount of unused storage capacity available. -160- Comparison of Flood Control Accomplishments Floods with magnitudes of 10,000 second- feet or less generally cause little, if any, damage along the San Dieguito River. Flood magni- tudes that exceed 10,000 second- feet cause damage approximately in proportion to the magnitude of the flood. Frequency curves for uncon- trolled peak flows at potential reservoir sites are shown on Figure 1, Plate 21. The amount and frequency of occurrence of available storage capacity on April 1, in each of the three potential reservoirs, is shown on Figure 2, Plate 21. The effect of each reservoir on floods of different recurrence intervals is set forth in Table 36. The regulating effect of surcharge storage on reduction of flood discharges at potential reservoirs, and the effect of surcharge storage, when combined with April 1 conservation storage space available 50 per cent of the time, are shown graphically on Figures 3, h, and 5 of Plate 21. -161- TABI£ 36 ' EFFECT OF POTENTIAL CONSERVATION RESERVOIRS ON FLOOD MAGNITUDES AND FREQUENCIES IN SAN DIEGUITO RIVER WATERSHED : tAvailable : t t storage : tTotal gross s capacity : Peak discharge, in second-feet, : storage t occxirring : for Indicated flood re'currence s capacity ats^O per cents interval, in years t spillway ;of the times s crest p in son April 1, : Reservoir and con- dition imder which discharge occurs acre=feet in acre-feet r^ $ t 25 100 t 1000 Pamo "ff * (1} Uncontrolled flood flows at dam site (2) Spillway discharges idien floods con- trolled by suroharge storage above spill- way crest only (3) Spi5JJ.way discharges irtien floods con- trolled by surcharge storage above spill - way crest and avail- able storage capacity occurring $0 per cent of the time on April 1 (k) Resultant outflow from existing Hodges Reservoir considering surcharge storage above spill way crest only in Pamo "B^ Res- ervoir . . (5) Resultant outflow from existing Hodges Reservoir considering surcharge storage above spillway crest and available storage capacity occurring 50 per cent of the time on April 1 in Pamo *W Reservoir 163,U00 8,000 12,600 39,200 67,200 12U,000 U,800 19,800 37,200 75,U00 1,200 16,800 35,U00 7U,500 7,200 31,700 63,200 129,500 lt,ooo 30,000 61,900 128,500 -162- EFFECT OF POTENTIAL CONSERVATION RESERVOIRS ON FLOOD MAGNITUDES AND FREQUENCIES IN SAN DIEGUITO RIVER WATERSHED (continued) Reservoir and con- dition imder which discharge occurs sAvailable ; t storage : Total gross s capacity ; storage t occurring : capacity ats50 per cent: spillway sof the time: crestj in son April 1, : acre-feet : in : t acre-feet : Peak discharge, in second-feetj, for indicated flood recurrence interval, in years 25 100 San Pas qual (1) Uncontrolled flood flows at dam site (2) Spillway discharges I when floods controlled by surcharge storage above spillway crest only (3) Spillway discharges when floods controlled by surcharge storage above spillway crest and available storage capacity occurring 50 per cent of the time on April lo (I;) Resultant outflow I from existing Hodges Reservoir considering surcharge storage above spillway crest only in San Pasqual Reservoir (5) Resultant outflow from existing Hodges Reservoir considering surcharge storage above spillway crest and available storage capacity occurring 50 per cent of the time on April 1 in San Pasqual Reservoir 335«000 80^000 1,000 12,500 lil,700 BOpOOO 1U7,000 U,700 25,500 5U,5oo 109,300 25,000 85,000 li,8oo* 26,700 58,700 109, Uoo 3,000* 26,000 85,500* -163. EFFECT OF POTENTIAL CONSERVATION RESERVOIRS ON FLOOD MAGNITUDES AND FREQUENCIES IN SAN DIEGUITO RIVER WATERSHED (continued) 8 s Available : s : storage : Total gross : capacity : Peak discharge, in second-feet. Reservoir and con- ; storage z occurring ! for indicated flood recurrence dition under which : capacity ats^O per cent ! interval, in years discharge occurs ; spillway jof the time i crestj in :on April 1," ; acre-feet : in : 5 : 2$ : 100 : 1000 s : acre=feet Super Hodges (1) Uncontrolled flood flows at dam site (2) Spillway discharges when floods controlled by surcharge storaige above spillway crest only (3) Spillway discharges when floods controlled by surcharge storage above spillway crest and available storage capacity occvirring 50 per cent of the time on April 1 365,000 120,000 13,^00 U5,900 88,UOO 163,200 U,3oo 19,600 U5,ooo 9U,6oo 6, $00 62,000 Interpolated figures -16^ The effect of Pamo "F' Reservoir on floods of various magnitudes in San Pasqual and San Dieguito Valleys, considering surcharge storage only and considering both surcharge and available reservoir storage occurring 50 per cent of the time on April 1, is illustrated on Figure 6, Plate 21. Similarly, the effect of San Pasqual and Super Hodges Reservoirs on floods of various magnitudes in the San Dieguito Valley under the same conditions is shown on Figures 7 and 8, respectively, on Plate 21<, The relationship between peak dischso^ges and damage from floods of various magnitudes in the San Dieguito and San Pasqual Valleys, based on flood damage data developed by the United States Airay Corps of Engineers, was estimated for average conditions of development for the 50-year period, 1958 through 2007, and is shown on Figure 1, Plate 22 » The flood control benefits that would result under each type of operation, for each reservoir considered, would be equal to the difference between the monetary losses from flood damage occurring -under existing con- ditions and the losses occurring under each type of operation, based on the average value of properties in the overflow areas involved during the 50-year period from 1958 through 2007 » The damage -frequency relationship for floods of various frequencies in San Pasqual and San Dieguito Valleys \mder existing conditions of protection is shown on Figures 2, 3, h, and 5, Plate 22, and was obtained by combining the data represented by the damage-discharge curves shown on Figure 1, Plate 22, with the data represented by the frequency of discharge curves in Figure 1, Plate 21, adjusted for effect of surcharge storage in existing Hodges Reservoir, >165- The damage-frequency relationships for floods of various fre- quencies in San Dieguito Valley, considering surcharge storage only and also considering both surcharge storage and the available storage space occurring $0 per cent of the time on April 1, in Pamo "B", San Pasqual, and Super Hodges Reservoirs, are shown on Figures 2, 3, and kt respectively, of Plate 22. These relationships were derived by combining discharge-fre- quency data represented by the two lower curves on Figure 6 and the curves on Figures 7 and 8, Plate 21, with damage-discharge date represented by the upper curve on Figure 1, Plate 22, Similarly, damage-frequency re- lationships of floods of various frequencies in San Pasqual Valley, con- sidering the two afore-mentioned reservoir storage conditions for Pamo "B" Reservoir are shown on Figure $, Plate 22. These relationships were de- veloped by combining data represented by the two upper curves on Figure 6, Plate 21, with corresponding data represented by the lower curve on Figure 1, Plate 22. The area between the damage-frequency curves representing existing conditions of flood control and the dartiage-frequency curves for each of the two storage conditions, for each of the three reservoirs con- sidered, represents the estimated average benefit that would accrue under each storage condition. IJhe estimated average annual benefit attributable to each of the thz-ee pocentipj. conservation reservoirs are presented in Table 37 and shown on Figure 6, Plate 22. , -166- ro S W (d bO XI » O o «j H ;3 T» ^1 0) oj 2>^ H fl H ri H C! -P (1) ■0 rd Xi ,Q ft §= .. 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Ussiiig tLc-; oe:;s'-:.'ab .la cor5, 779,000, respectively. It is evident that appreciable flood control benefits would be reali: ed, and a major share of the need for flood control in the watershed v/ould be satisfied, by the construction and operation of large water conservation reservoirs. •lo9- CH/iPTER VI. CCMPARISON OF PLANS FOR WATER DEVELOPMENT A discussion of individual projects for the control and develop- ment of surface and ground water supplies within the San Dieguito River watershed, including the anticipated yields to be developed and project costs, was presented in Chapter IV, entitled "Plans for Water Development". Individual projects, and combinations of projects, described in Chapter IV, are compared in this chapter primarily on the basis of seasonal yield, capital and annual costs, and cost per acre-foot of yield. They are also discussed from the aspect of inherent qualitative advantages and disadvan- tages . Through such comparisons of project combinations, the interre- lationships between individual developments and the net effect on costs and yields of the various plans considered are accentuated. The desir- ability of stage development of the water resources of the watershed is also reported on in this chapter. The final selection of the project to be constructed will, of necessity, be influenced by present and future need for development of additional water supplies considering availability of other local and imported water supplies, cost of water developed within the San Dieguito River watershed in relation to cost of water from other sources, and the ability and willingness of the City of San Diego, or other agencies, to finance the construction and operation of the water development facilities. Development of San Pasqual-Main Lake Hodges Ground Water Basin Additional ground water supplies through development of San Pas- qual-Main Lake Hodges Basin could be made available almost immediately. -na in contrast to the probable delay which would be encountered in securing equivalent supplemental supplies from surface storage facilities. In semiarid San Diego Countyp where lengthy periods of drought are often experienced^ five or ten years might elapse before the safe yield could be obtained from surface storage » Ground water is not as readily susceptible to evaporation losses as water stored in sxirface reservoirs. Although high groxind water levels generally result in increased phreatophyte growth and water losses, the average ground water levels dilring a mean period under planned basin op- eration would be considerably lower than under present conditions,, The major disadvantage associated with developing additional ground water yield from the San Pasqual-Main Lake Hodges Basin is that the underground storage capacity cannot normally be filled as fast as water becomes available since replenishment is dependent on the infiltration rate of the surficial material and the permeability of the underlying sediments o The proposed utilization of San Pasqual-Main Lake Hodges Basin would resialt in a maximum ground water storage depletion of UljOOO acre- feeto The basin, when operated coordinately with existing Sutherland and Hodges Reservoirs,, woiild produce a net safe seasonal yieldc, creditable to the ground water basin^ of about 5s800 acre-feet or about 2^600 acre=feet more than under present conditions of operationo It is assumed that the Sutherland-San Vicente Reservoir system would be operated so that a por- tion of the water which would have spilled from Sutherland Reservoir would be transferred to existing San Vicente Reservoiro This operation is here- inafter referred to as the "transfer of spill" operationo Without such an operations the net safe seasonal yield creditable to the ground water basin would be approximately 6^000 acre-feet o as discussed in Chapter IVo »171- Capital and annual costs of utilizing the msucimum groiiad water storage capacity of Ifl^OOO acre-feet of the San Pasqual-Main Lake Hodges Basin are estimated to be $6,l60;,000 and $315,000, respectively, including the cost of laads now owaed by the City of San Diego and. conveyance facilities. The estimated combined net safe seasonal a(?.4itional yield to the City of San Diego from operation of the basin and with transfer of spill to San Vicente Reservoir would be '^,600 acre-feet creditable to the ground water basin. The total cost to develop this additiozsal yield is estimated to be about $5^ per acre -foot of new yield. If the total yield from San Pasqual-Main Lake Ho^.ges Basin w«s not developed for use on overlyiag aad adjscent hilly lands, but was ex- por-bed outside the watershed by tke City of Saa Diego, it would probably be necessary fvo:^ the City to acquire a7^1 laads within aad adjacent to the basin or the water rights coritiguous thvrerLth. The City has purchased most of the laMs within San Pasqual-Maiii Lake Hodges Basin. To determine the additional cost to the City of developing the largest usable gL"Oxmd water storage capacity, the value of all ItsaJ-s and improvements not pre- sently owned by the City and required by the project was estimated. It is understood that the City is negotiating with representa- tives of The San Pasqual Academy for the purpose of acquiring the right to the use of ground waters underlying the Academy. It has been assumed for cost estimating purposes that the City would acquire the Academy property as part of the ground x/ater deijelopment . If the value of lands and improvements now owned by the City of San Diego within the project area is deducted from the total project cost, the additional cost to the City for developing the largest usable ground water storage capacity considered herein, is estimated to be about $3^ per acre-foot of additloneO. yield. -172- The City of San Diego reports it would probably purchase the remaining privately^owned land in San Pasqual-Main Lake Hodges Basin if the decision of the trial court, in the case of " Stanley Truss ell j, et al„„ plaintiffs „ vs„ The City of San Diego, a Municipal Corporation ^ defendant" p is upheld on appeal,, In this event, the cost of the acquisi- tion of the remaining lands and improvements in the basin to permit unrestricted use of Sutherland Reservoir could be charged against the Sutherland Reservoir project and not against potential ground or sur- face water developments in the watershed o However, for purposes of this investigation, the cost of land acquisition in the basin was not charged against the Sutherland Reservoir project » Accomplishments resulting from utilization of various ground water storage capacities in the San Pasqual-Main Lake Hodges Basin, and the capital and annual costs of developing additional yields are com- paredj in Table 38, with the accomplishments and costs of other plans of development o The relationship between ground water storage capacity and project capital cost for the ground water basin development are shown on Plate 23, while the relationship of storage capacity and addi- tional safe seasonal yield is shown on Plate 2i4o The relationship between additional safe seasonal yield and annual cost per acre-foot of yield is presented on Plate 25<, On the basis of these relationships and in recognition of the current financial investment by the City of San Diego in acquiring lands and improvements in San Pasqual-Main Lake Hodges Basin and the immediate availability for use of ground water in storage in the basin, it is assumed that San Pasqual-Main Lake Hodges Basin would be further developed and used in conjunction with spillway -173- gates on Sutherland Dam before, or simultaneously with, the construction of dams and reservoirs at the Pamo "B", or San Pasqual sites, or enlarge- ment of San Vicente Reservoir. .I7U- TABLE 38 Average annual incremental coats per acre-foot of incremental additional combined safe seasonal system yield Reservoir Totals Addi- Addi- tional tional 1 cost to the Total .Conveyance facilities cost to the Project total City of San Diego City of San Diego $5.50^ $ 5.50^ 8.90^ 8.90'' $3l4.20 $3h.20 $ 5.80 liO.OO I4O.00 51.10 51.10 3.70 5It.80 5U.80 25.UO 26.70 7.50 32. yo 3U.20 UO.30 1^2.20 18.70 59.00 60.90 67.80 9U.U0 6.70 7I4.50 101.10 52.90 63. Uo 7.U0 60.30 70.80 COMPARISON OF YIELDS AND COSTS OF ALTERNATIVE PLANS FOR DEVELOPMENT WITHIN SAN DIEGUITO RIVER WATERSHED Plan for developmonta within San Dleguito River wstershed Qroaa reaerroir t Combined safe aea- storaga capacities, :sonflJ. system yields, in acre-feet ! in acre-faet Addi- tional for ! Addl- : Total Total ; tional : for for : for ; uae by City nf t U90 by : City of ; San Diego: City of :San Disgo: :San Diego: : Capital costs Average annual costs Addi- tional coat to the City of San Diego Conveyance faciUtiea Addi- tional cost to the City of San Die g o Addi- tional City of I Conveyance ■ I facilities Addi- tional cost to the City of San Diego to the City of San Diego Totals Addi- tional cost to the City of S ail Diego Average annual incremental costs per acre-foot of increniBntal additional combined safe seasonal ajatem yield Addi- coat to the City of ! San Diego ! Addi- coat to the City of San Dieg o Bodges Beaervoir, capacity; 33,550 acre-feet Sutherland Reservoir, capacity: 2S,660 acre-feet Existing San Vicente Reservoir, capacity: 5»300 acre-feat* San Pasqual-Haln Lake IJodgea Basin, capacity: 13,700 acre-feet 27,000 acre-feet 111, 000 acre-feet Hodges Reservoir, capacity; 33.550 acre-feet Sutherland Resereoir, capacity: 29,68o acre-feet Existing San Vicente Reseivoir, capacity: 5,300 acre-feet* Addition of spillway gates at Sutherland Reaerrolr, capacity: 7,750 acre-feef^ Kodgea Reservoir, capacity: 33,550 acre-feet Sutherland Reaervoir, Kith spillway gates, capacity: 37,li30 acre-feet ErLetlng San Vicente Reservoir, capacity; 5,300 acre-feet* San Pasqual-Haln Lake Hodges Basin, capacity: U.,000 acre-feet Pano Reservoir, capacity: 90,000 acre-feet 135,000 I }-feet 163,ii00 acre-feet Hodges Reservoir, capacity: 33,550 acre-feet Sutherland Reaervoir, with spillway gates, capjacity; 37,1430 acre-feet fisafltlng San Vicente Reservoir, capacity: 5,300 acre-feet* San Pasqual Reservoir, including uae of 37,000 acre-feet of ground wmter storage edacity within the reservoir area, total capacity: 137,000 acre-feet 257,000 acre-feet 372,000 acre-feet** ^therlasd Reservoir, with spillmy gates, capacity: 37tli30 acre-feet Edetlng San Vicente Beaervoir, c^>acity: 5,300 acre-fe«t^ Super Hodgea Beaervoir, capacity: 157,300 acre-feet* 310,000 acre-feet*^ 365,000 acre-feet"8 13,700 82,230 3,200 12,300 27,000 95,530 ii,700 13,800 111, 000 109,530 5,800 114,900 7,750 76,260 — » 3,li60,1.00'* 9 5,966,900^ 3,537, 100*' 6,0l43,5O0'> 3,657,300^ 6,163,700*' * 180,600° » 296,000° iac,9oo*' 306,300'' 198,700** 316,100*' 138,750 207,260 9,600 18,900 *11, 366,500 13,933,900 13,361,200 Ui,727,700 17,295,100 $ 572,200 183,750 252,260 12,200 21,300 13,053,100 15,620,500 3,652,600 16,705,700 19,273,100 65l4,U00 212,150 280,660 13,800 22,900 lU, 761,800 17,329,200 3,775,900 16,537,700 21,105,100 736,100 li|li,750 213,280 8,700 17,B00 12,599,flO0 lii,li37,800 1,530,200 li4,130,000 26U,750 333,260 lii,200 23,300 15,Ulii,200 17,U07,200 1,9146,900 17,361,100 379,750 lil43,880 I6,l400 27,500 16,879,1400 21,051, UOO 2,3142,900 21,222,300 692,1400 7714,600 856,300 1160,800 17ii,700 180,700 733,000 853,200 829,100 9149,300 916,600 1,037,000 15,968,000 606,500 692,500 101,600 706,100 79ti,100 19,3514,100 71j6,200 839,600 1142,600 868,800 982,200 23,3914,300 915,1*00 1,017,100 221,000 1,136,U00 1,238,100 131,500 200,030 14,600 13,700 13,933,500 19,3614,200 921,600 114,855,100 20,285,800 669,300 923,700 67,000 730,300 2814,200 3U8,830 11,300 20,liOO 23,Ua,300 32,678,900 1,307,000 214,7148, 300 33,985,900 1,123,800 1, 556,1*00 111,600 1,235,1*00 1, 339,200 1*02,1430 13,500 22,600 25,851,900 35,563,1*00 1,1465,700 27,317,600 37,01*9,100 1,21*0,100 1,695,800 128,000 1,368,100 1; 990,700 1,668,000 L, 823,800 a. Dtiliilng 5,300 acre-feet of storage capacity in erlating San Vicente Reservoir that is not needed to regulats natural runoff of San Vxc8nt« Creek and the estlnated 1975 Imports to the City of San Diego throu^ the First San Diego Aqueduct. b. Includes coat of conveyance facilities from San Pasqual-Kaln Lake Hodgea Basin to Hodges Reservoir. c. Aasuaes preawit land and wter use in San Pasqual-Hain Lake Hodges Basin and coordinate operation of Hodges and Satherland Reservoirs with transfer of spills to San Vicente Reservoir. d. Required storage capacity in ejlsting San Vicente Reoenroir to reregulate transferred opilla is only 900 acre-feet. m. Aasuoes present land and water uae in the portion of San Paaqual-Maln Lake Hodgea Baaln which would not be inundated by Super Hodgea Reaervoir and coordinate operation of Sutherland and Super Hodges Heearvoirs with transfer of spilla to San Vicente Reaervoir. f. Required storage capacity in existing San Vicente Reaervoir to reregulate transferred apilla ie only 1,1400 acre-feet. g. Ho additional storage capacity re<;uired at existing San Vicente Reservoir. t 56.140" 8 93.10" 140.20*' 65.20*' 3li.30*> 5U.50'' — t 20.70 $ 56.1*0 70.70 $16. ao 7I4.8O 53.60 63.50 II4.3O 67.90 53.30 62.00 13.10 66.1*0 69.70 79.60 11.70 61,1*0 52-50 59.10 10.10 62.60 I49.8O 55.30 12.00 61.80 lli5.50 200.80 II4.6O 160.10 99.1*0 137.70 9.90 109.30 91.60 125.60 9.50 101.30 215.1*0 11*7.60 135.10 $31*. 20 51.10 »3l*.20 S 5.60 51.10 3.70 9I4.I4O 6.70 63.1*0 7.I4O » 5.50" I 5.50" 8.90*' 5.90** 140.00 514.60 »1.30 25.10 26.70 7.50 32.JO 31i.20 69.20 W.30 li2.20 18.70 59.00 60.90 67.30 7I4.5O 101.10 60.30 70.80 Potential Surface Storage Developments There are several potential siirface water development facilities which might be constructed in the San Dieguito River and adjacent water- sheds. Each of these developments wo\ild serve to provide additional safe seasonal yield^ over and above that of the existing development » The poten- tial developments include the provision of storage at Pamo "B", San Pasqual, or Super Hodges sites in conjunction with the addition of spillway gates to the existing Sutherland Dam, and a proposed enlargement of San Vicente Reservoir in the San Diego River watershed. Addition of Spillway Gates on Sutherland Dam The installation of spillway gates on Sutherland Dam would in- crease the combined net safe yield of Sutherland and Hodges Reservoirs when operated coordinately, from 9>100 acre-feet to 9,700 acre-feet per season, under present conditions of ground water development and with "transfer of spill" operation of Sutherland and existing San Vicente Reser- voirs „ The estimated capital cost of developing the 600 acre-feet of new yield would be $2li3,500, equivalent to an average annual cost of about $21 per acre-foot of new yield » It is assiimed that the City of San Diego would add gates whenever the reservoir stage becomes high enough to assure their use. Spillway gates at Sutherland Dam are, therefore, assianed to be in- stalled when considering alternative developments at the Pamo "B", San Pasqual, and Super Hodges sites. -175- Potential Surface Storage Developments There are several potential surface water development facilities which might be constructed in the San Dieguito River and adjacent water- sheds. Each of these developments would serve to provide additional safe seasonal yield^ over and above that of the existing development » The poten- tial developments include the provision of storage at Pamo "B", San Pasqual, or Super Hodges sites in conjunction with the addition of spillway gates to the existing Sutherland Dam, and a proposed enlargement of San Vicente Reservoir in the San Diego River watershed. Addition of Spillway Gates on Sutherland Dam The installation of spillway gates on Sutherland Dam would in- crease the combined net safe yield of Sutherland and Hodges Reservoirs when operated coordinately, from 9jlOO acre-feet to 9^700 acre-feet per season, under present conditions of ground water development and with "transfer of spill" operation of Sutherland and existing San Vicente Reser- voirs, The estimated capital cost of developing the 600 acre-feet of new yield would be $2U3,500, equivalent to an average annual cost of about $21 per acre-foot of new yield. It is assumed that the City of San Diego would add gates whenever the reservoir stage becomes high enough to assure their use. Spillway gates at Sutherland Dam are, therefore, assumed to be in- stalled when considering alternative developments at the Pamo "B", San Pasqual, and Super Hodges sites. -175- storage, yield, and cost relationships associated with installa- tion of spillway gates on Sutherland Dam are presented in Table 38- Plates 23, 2U, and 25 contain illustrative data pertaining to these relationships. Pamo "B" Reservoir Cost of right of way and road and utility relocation required for a surface storage development at the Pamo "B" Reservoir site would be appre- ciably lower than such costs for projects at the San Pasqual and Super Hodges Reservoir sites. Furthermore, releases from Peuno "B" Reservoir could be conveyed to the proposed Miramar Reservoir of the City of San Diego by gravity flow, whereas, the remaining alternative surface reservoir plans would require pumping facilities . The length of pipe line required for the Pamo development, however, would be more than twice the length of the conduit needed for diversion from San Pasqual or Super Hodges Reservoirs . Reservoirs at the Pamo "B" site would produce a greater new yield per acre-foot of storage capacity than either San Pasqual or Super Hodges Reservoirs; however, even the largest reservoir considered at the Pernio "B" site, with a capacity of l63,itOO acre-feet, does not control a sufficient portion of the watershed runoff to effect complete water development. This condition is true even with coordinate safe yield operation of San Pasqual - Main Lake Hodges Basin and existing surface storage facilities. In view of the water supply situation in the San Dieguito River watershed, it was assumed for purposes of determining cost-yield relationships for a develop- ment at the Pamo "B" site that the City would purchase all the lands in San Pasqual Valley and the costs thereof would be a charge against the Pamo "B" project. It was, therefore, also assumed that the City would further de- velop the ground water supplies within San Pasqvial-Main Lake Hodges Basin -176. and that the new yield resiilting therefrom would be added to the yield from the Pamo "B" project to increase the combined system yieldo Three capacities for Pamo "B" Reservoir were considered which would provide incremental seasonal yields ranging from 3s600 to 7j600 acre- feet in excess of that which could be obtained from utilization of i^ljOOO acre-feet of ground water storage capacity in San Pasqual-Main Lake Hodges Basinp in conjunction with spillway gates on Sutherland Damj and with the "transfer of spill" operation between Sutherland and existing San Vicente Reservoirs o These incremental yields coiild be developed at an additional average annual unit cost to the City of San Diego varying from $lii$ to $93 per acre-foot,, as derived from Tables 31 and 38, The flood control benefits accrued from operation of Pamo "B" Reservoirj although substantial^ wo\ild be less than the benefits achieved from operation of either San Pasqual or Super Hodges Reservoirs, The capital and annual costs of the largest size reservoir con- sidered at the Pamo "B" site5 having a storage capacity of l63jU00 acre- feetj together with spillway gates on Sutherland Dam and utilization of UljOOO acre-feet of ground water storage capacity in Ssui Pasqual-Main Lake Hodges Basin^, are estimated to be $21pl05jlOO and $15037,000^, respectively, including cost of conveyance facilities » The estimated combined net safe seasonal additional yield to the City of San Diego from the system, credit- able to these three developments, assviming a "transfer of spill" operation of Sutherland and existing San Vicente Reservoirs, is 13,800 acre-feet. The total cost to develop this additional yield is estimated to be about $75 per acre-foot of new yield. Since the City of San Diego already owns land within the Pamo "F' project area and San Pasqual Valley, the estimated additional cost to the City for these developments would be about $66 per acre-foot of new yield, -177- Total and new system yields for various storage capacities of Pamo "F» Reservoir and the capital and annual costs of developing these new yields are compared with storages, yields, and costs of other plans of development in Table 38, The relationship between storage capacity and project capital cost for the project is shown on Plate 23, and that between storage capacity and additional safe seasonal yield is shown on Plate 2U. The relationship between additional safe seasonal yield and annual cost per acre-foot of yield is presented on Plate 2$» San Pasqual Reservoir A reservoir at the San Pasqual site would control most of the runoff from the watershed. The largest reservoir considered at the San Pasqual site would produce somewhat greater flood control benefits than the largest reservoir considered at the Pamo "B" site but somewhat less than the benefits which would be achieved at the Super Hodges site. The static pimping lift between a development at the San Pasqual site and proposed Miramar Reservoir of the City of San Diego wo\ald be approximately 363 feet, whereas water diverted from Pamo "ff' Reservoir would flow to Miramar Reservoir by gravity. Development of the San Pasqual site could involve extensive re- location of State Highway No» 78 from the City of Escondido to the community of Ramona if a route along the northerly border of San Pasqual Valley generally paralleling the present route, was adopted. The present route was added to the State highway system by legislative act. However, it is estimated that the highway could be rerouted at considerably less cost if the existing bridge on U« S, Highway No. 395 across the San Dieguito River was used. The route to Ramona would then extend southeasterly through Green Valley to join State Highway No, 67 at a point near Woodson Mountain, -178- This routing of State Highway Noo 78 would require about three miles of new road and the cost would be about one=tenth the cost of the northerly relo-= cationo The State Division of Highways reports that action by the State Legislature would be required before a route through Green Valley could be adopted 8 Three sizes of development at the San Pasqual site,, including 37j>000 acre=feet of ground water storage capacity within the reservoir area, were considered which would provide incremental seasonal yields ranging from 2^500 to 12^200 acre-feet in excess of that which could be obtained from utilization of UlsOOO acre-feet of ground water storage capacity in San Pasqual=>Main Lake Hodges Basinj in conjunction with spillway gates on Sutherland Dam, and with the "transfer of spill" operation between Suther= land and existing San Vicente Reservoirs o These incremental yields could be developed at an additional average annual unit cost to the City of San Diego varying from $199 to $76 per acre-footj, as derived from Tables 31 and 380 The capital and annual costs of the largest size reservoir con= sidered at the San Pasqual site, with a storage capacity of 335j,000 acre- feet, together with spillway gates on Sutherland Dam, are estimated to be $23s39Uj300 and $1^239,1005 respectively ^ including cost of conveyance facilities and the development of 37sOOO acre-feet of ground water storage capacity available within the reservoir area„ Such a plan of develop- ment would conserve about 60 per cent of the present waste to the ocesm from the San Dieguito River, The estimated combined net safe seasonal additional yield to the City of San Diego from the system for these •=179= developments, assianing a "transfer of spill" operation of Sutherland and existing San Vicente Reservoirs, is 18,U00 acre-feet, and the total cost to develop this additional yield is estimated to be about $67 per acre- foot of new yield. Since the City of San Diego now owils land within the project area, the additional cost to the City for this development would be approximately $62 per acre-foot of new yield. Yields from these developments for various storage capacities of San Pasqual Reservoir and the capital and annual costs of developing these new yields are compared with yields and costs of other plans of development in Table 38. Relatioriships between storage capacity, yield, and cost are shown on Plates 23» 21;, and 25. If coordinate operation of surface and ground water storage were initiated at the San Pasqual site subsequent to development of the San Pasqual-Main Lake Hodges Basin, the well pumping equipment and dis- tribution system existing at that time in the basin and within the sur- face reservoir area would require substantial and costly modification, ^ereas, no such modification would be necessary as a result of subse- quent stage development at the Pamo "F* site. Super Hodges Reservoir Super Hodges Reservoir, created by construction of a dam just downstream from existing Hodges Dam, wo\ild control runoff from a larger drainage area than reservoirs at the Pamo "B" or San Pasqual sites and, therefore, would effect the greatest reduction of waste to the ocean. However, Super Hodges Reservoir is subject to hi^ evaporation losses -180- per acre-foot of storage. Additionally^ the first 33>550 acre-feet of storage provided would merely replace the storage in existing Hodges Reservoir o For these reasons, new yields from the Super Hodges Reservoir development would .be somewhat less than those capable of development from either Pamo "B" or San Pasqual Reservoirs with comparable storage capacities. Due to its location and storage capacity, th3 greatest flood control benefits of any of the three alternative surface storage plans considered would be achieved from a reservoir at the Super Hodges site. Super Hodges Dam wou].d be located at a lower elevation than either San Pasqual or Pamo "B" Reservoirs. The static pumping lift bet- ween Super Hodges Dam and the proposed Miramar Reservoir would be approxi- mately kh^ feet. Costs of highway relocation for a project at the Super Hodges site would be substantially greater than similar costs for developments at the Pamo "B" or San Pascjual sites and would aimount to approximately 13 million dollars for the 365,000 acre-foot capacity reservoir. The major component of this cost would be caused by the necessary modification of a four -lane bridge and approaches, scheduled for construction in the next few years, on U. S. Highvray No. 395. However, the cost to the City of San Diego of modifying U. S. Highway No. 395 as a result of construction of a dam and reservoir at the Super Hodges site would be based on the existing two-lane highway, as provided in an agreement dated May 2"], 195'+> between the City and the State Division of Highways. A copy of this agreement is included in Appendix K. -181- Costs of lands and istproTements vlthin the Super Hodges Dam and Reservoir area, other than that required for highway relocation, would also be considerably greater than for either of the two alternative sur- face storage projects and would amount to about $7,000,000 for the 365,000 acre-foot capacity reservoir* Capital and annual costs of the largest size dam and reservoir con- sidered at the Super Hodges site, with a storage capacity of 365,000 acre-feet, together with spillway gates on Sutherland Dam, are estimated to be $37,Oii9,100 and |1, 823,800, respectively, including cost of conveyance facilities. This does not Include the cbst of coordinate use of 1^1,000 acre- feet of ground water storage capacity within San Pasqual-Main Lake Hodges Basin. This latter cost was not considered as it was apparent that pros- pective new yield from ground water development, amounting to about U,700 acre-feet per season, even if secured at no additional cost, would not alter the cost-yield relationship for the Super Hodges project to such a degree as to make it competitive with other conservation developments con- sidered herein. The estimated combined net safe seasonal additional yield to the City of San Diego from this plan, excluding development of Ul,000 acre-feet of ground water development, but including an assvmed "transfer of spill" operation of Sutherland and existing San Vicente Reservoirs, is 13,500 acre- feet, and the total cost is estimated to be about $135 per acre-foot of new yield. If the value of lands now owned by the City of San Diego within the project area and the cost of non-City modification of U, S. Highway No. 395 are deducted from the project cost, the additional cost to the City for this development wo\ild be approximately $101 per acre-foot of new yield. ^182- Yields for various storage capacities of Super Hodges Reser- voir and the capital and annual costs of developing these new yields are compared with yields and costs of other plans of development in Table 38- The relationships between storage capacity, yield, and cost are shown on Plates 23, 2U, and 25. San Vicente Reservoir Comparison of potential ground and surface water developments previously discussed in this chapter has been confined to those projects which would be constructed within the San Dieguito River watershed. During periods of spill from all reservoirs in the San Dieguito River watershed, it would be feasible to increase the diversion from Sutherland Reservoir to San Vicente Reservoir. This would entail the temporary diver- sion of a quantity of water considerably in excess of the ajnouiit diverted under the proposed system of safe yield operation of existing reservoirs within the watershed only. For the same reasons, such diversions could also be made, although in smaller amount, with one of the potential alter- native plans considered for construction in the San Dieguito River watershed. This method of operation has the advantage of making water which would have wasted to the ocean under a safe yield operation of facilities within the San Dieguito River watershed available to the City of San Diego through the existing facilities . The magnitude of diversions from Sutherland Reservoir to San Vicente Reservoir, in excess of that possible under a combined system safe yield operation, becomes progressively less as storage is increased within the San Dieguito River watershed, as set forth in Table 3I • No appreciable flood control benefits in the San Dieguito River watershed would result from conservation effected by an enlarged San Vicente Reservoir. .18> System yield from this operation could thus be increased with- out additional cost to the City^, due to the estimated available storage capacity in San Vicente Reservoir under 1975 conditions of import. This capacity, however, will not be sufficient to reregulate all water which would be available for diversion under existing conditions or, except for the largest reservoirs, under potential alternative developments within the San Dieguito River watershed. The City of San Diego, however, by a reduction in the purchase of imported water from the San Diego County Water Authority, and the coincident conservation and reregulation in San Vicente Reservoir of an equivalent quantity of San Dieguito River water- shed water, could effect a considerable monetary saving while maintaining the total water supply as a constant quantity. Table 32 illustrates the results of an operation of this type. After utilization of UljOOO acre-feet of underground storage capacity in San Pasqual-Main Lake Hodges Basin, together with installa- tion of spillway gates on Sutherland Dam, the next least costly increment of additional yield, to a maximum of 3j600 acre-feet per season, could be obtained by diversion of flood flows from Sutherland Reservoir to an en- larged San Vicente Reservoir, as derived from Tables 31, 38, and 39. The vol- ume of water available for diversion to San Vicente Reservoir, however, be- comes less as storage is increased within the San Dieguito River watershed. If developments were constructed at either the Pamo "F* or San Pasqual site after San Vicente Reservoir was enlarged, the unused storage capacity in San Vicente Reservoir resulting from the decrease in diversion from San Dieguito River watershed could be utilized for storage of imported water. -18 U- TABLE 39 . Average annual incremental costs per acre-foot of J incremental additional combined safe seasonal system yield Reservoir Addi- tional cost to the City of San Diego Total Totals : t • t m 4 i Addi- ! t tional ; : Conveyance ! cost . Project : facilities : : : to the ! City of 1 total ! ) San Diego i 1-2.20 1-2.20 1 9.90 $ 7.70 $ 7.70 1.70 1.70 10.00 11.70 11.70 7.50 7.30 5.ii0 9.60 11.70 21.80 14.20 29.10 6.30 31.1iO COMPARISON OF YIELDS AND COSTS OF ALTERNATIVE PLANS FOI AND ENLARGEMENT OF SAN 1 Combined safe : seasonal system ; yield, in acre-feet Plan for developments within San Dieguito River vratershed Qross reservoir storage capacity available to the City of San Diego, in acre-feet Addi- tional at San Vicente Reservbir Total at San Vicente Addi- tional from San Dieguito River watershed Reservoir: develop- : ments and Total of San Dieguito River watershed develop- : Addi- itional for I use by City of ments and :San Diego ; San VicenteiSan Vicente: : Reservoir : Reservoir Total for use by City of San Diego Capital cost; Addi- tional cost to the City of San Diego 1. Hodees Reservoir, capacity: 33,550 acre-feet Sutherland Reservoir, capacity. 29,680 acre-feet® Portion of existing San Vicente Reservoir utilized: 5,300 acre-feet 2. Hodges Reservoir, capacity: 33,550 acre-feet Sutherland Reservoir, with spillway gates, capacity: 37,U30 acre-feet Portion of existing San Vicente Reservoir utilized: 5,300 acre-feet San Pasqual-Main Lake Hodges Basin, capacity: Ul,000 acre-feet 3. Hodges Reservoir, capacity: 33,550 acre-feet Sutherland Reservoir, with spillway gates, capacity: 37,U30 acre-feet Portion of existing San Vicente Reservoir utilized: 5,300 acre-feet San Pasqual-Main Lake Hodges Basin, capacity: Ul,000 acre-feet Pamo Reservoir, capacity: 90,000 acre-feet 135,000 acre-feet 163, UOO acre-feet li. Hodges Reservoir, capacity: 33,550 acre-feet Sutherland Reservoir, with spillway gates, capacity: 37,1j30 acre-feet Portion of existing San Vicente Reservoir utilized: 5,300 acre-feet San Pasqual Reservoir, including use of 37,000 acre-feet of ground water storage capacity within the reservoir area, total capacity: 137,000 acre-feet 257,000 acre-feet 372,000 acre-feet= 52,UOO li;2,600 52,1*00 205,830 1(9,U00 139,600 98,150 251,580 U.lOO 9,800 it0,600 130,800 179,350 332,780 12,1*00 25,600 115,800 209,350 362,780 13,800 11,1*00 101,600 223,550 376,980 ll*,l»00 li0,600 130,800 185,350 338,780 11,300 11,1*00 101,600 276,150 1*29,580 llj,800 90,200 379,750 533,180 18,1*00 18,1*00 $ 7,963,200 $ 7,963,200 21*,100 26,700 17,912,200 28,100 17,796,900 28,700 17,799,800 25,600 19,11*5,500 29,100 16,1*52,200 32,700 18,879,1*00 « 7,963,200 $ 7,963,200 11,503,600'' U,oio,ooo'' 20,1*79,600 3,361,200 21,273,1)00 23,81*0,800 20,361*,300 3,652,600 21,1*1*9,500 2l*,016,900 20,367,200 3,775,900 21,575,700 2l*,ll»3,100 20,983,500 1,530,200 20,675,700 22,513,700 20,1*1*5,200 1,91*6,900 20,399,100 22,392,100 21,051,1*00 2,31*2,900 21,222,300 23,39l*,300 a. Aasumes present land and water use in San Pasqual-Main Lake Hodges Basin and coordinate operation of Hodges and Sutherlajid resenroir with transfer of spills to San Vicente Reservoir. b. Includes coat of conveyance facilities from San Pasqual-Main Lake Hodges Basin to Hodges Reservoir. c. Required storage capacity to reregulate transferred spills is only 900 acre-feet. PLANS FOR DEVELOPMENT WITHIN SAN DIEGUITO RIVER WATERSHED T OF SAN VICENTE RESERVOIR TABLE 39 : Average annual costs Average annual costs per acre-foot of additional combined safe seasonal system yield Average annual incremental costs per acre-foot of incremental additional combined safe seasonal system yield Is j Reservoir Totals Reservoir I Totals Reservoir Totals : Addi- : tional Project : cost total t to the s City of ! San Diego t Total Conveyance facilities Addi- : tional : cost : Project to the ! total City of ' San Diego : : Addi- tional cost to the City of San Diego Total : : Addi- : tional Conveyance : cost facilities : to the t City of ! San Diego s Project total Addi- tional cost to the City of San Diego s : Conveyance Total : facilities : : Addi- tional cost to the City of San Diego . Project total 1 $376,000 I 376,000 $ 376,000 « 376,000 $91.70 $91.70 $91.70 $91.70 570,100 687,500° 58.20" 70;20'' 881,100 1,001,300 160,800 i,oia,9oo 1,162,100 71.00 80.70 13.00 81t.00 93.70 $-2.20 $-2.20 $ 9.90 $ 7.70 $ 7.70 878,000 998,200 17l»,700 1,052,700 1,172,900 63.60 72.30 12.70 76.30 85.00 1.70 1.70 10.00 11.70 11.70 879,000 999,200 180,700 1,059,700 1,179,900 61.10 69.it0 12.50 73.60 81.90 915,1*00 1,001,1*00 101,600 1,017,000 1,103,000 81.00 88.60 9.00 90.00 97.60 7.50 5.1*0 11.70 1*.20 6.30 889,100 982,500 11*2,600 1,031,700 1,126,100 60.10 66.U0 9.60 69.70 76.00 7.30 9.60 21.80 29.10 31.1*0 915,1*00 1,017,100 221,000 1,136,U00 1,238,100 1*9.80 55.30 12.00 61.80 67.30 A brief discussion of an enlargement of San Vicente Reservoir for regulation of imported water is presented in Bulletin No, 61, "Feather River Project- Investigation of Alternative Aqueduct Routes to San Diego Coiinty^, dated March, 1957. This importation would be over and above the estimated 197$ import to Ssm Vicente Reservoir ass\med in this report. Safe yields achieved by diverting from Sutherland Reservoir to an enlarged San Vicente Resei*voir during times of spill from all reservoirs in the San Dieguito River watershed under the different plans of development are presented in Table 39. -185- Capital and annual costs of a Ii.9,U00 acre-foot enlargement of San Vicente Reservoir, spillway gates on Sutherland Dam, and utilization of i]l,000 acre-feet of ground water storage capacity in San Pasqual- Main Lake Hodges Basin are estimated to be $lii,010,000 and $687,500, re- spectively, including cost of conveyance facilities. The estimated com- bined net safe seasonal additional yield to the City of San Diego from the system, creditable to these developments, is 9,800 acre-feet. The cost to develop this additionauL yield is estimated to be about $70 per acre-foot of new yield. If the value of lands and im- provements now owned by the City of San Diego within the project area is deducted from the project cost, the additional cost to the City would be approximately $$8 per acre-foot of new yield. Total and new system yields for various storage capacities of San Vicente Reservoir and the capital and annual costs of developing these new yields are compared with storages, yields, and costs of other plans of development in Table 39. The relationship between storage capacity and project capital cost for the project is shown on Plate 23, and that between storage capacity and additional safe seasonal yield is shown on Plate 2li. The relationship between additional safe seasonal yield and annual cost per acre-foot of yield is shown on Plate 2$, On the basis of these relation- ships and values of yield presented in Table 3U» it is apparent that to develop an additional system yield in excess of about 3,600 acre-feet per year, after developnent of San Pasqual-Main Lake Hodges Basin and addition of spillway gates on Sutherland Dam, it is more economicsil on the basis of the unit cost of new jrield to construct, at a higher capital cost, a dam and reservoir at either the Pamo "B'' or San Pasqual site, rather than to enlarge San Vicente Reservoir in conjunction with a development at either Of these two sites in the watershed. Selection of the stages in the -186- plan of development will dependj therefore, on the amount of new yield required and the availability of firnds to those agencies contemplating cons true ti on o -187- CHAPTER VII. CONCLUSIONS AND RECOMMENDATIONS The following conclusions and recommendations result from the investigation of the water supply and requirements of the San Dieguito River watershed and the City of San Diego. Conclusions 1, Mean seasonal runoff from the San Dieguito River watershed is about it3,U00 acre-feet, of which approximately 26,300 acre-feet, or 61 per cent of the total, would waste to the ocean under present conditions of development» 2, The safe seasonal yield of present water supply development within the watershed is about 18, 800 acre-feet, comprising 9,100 acre- feet from Hodges and Sutherland Reservoirs when operated coordinately with existing San Vicente Reservoir and 9,700 acre-feet from ground water basins. In addition, varying quantities of water are imported each year to the watershed frcan San Luis Rey River and through the San Diego Aqueduct. Un- der postulated "present" conditions, these imports amount to about 7,600 acre-feet per season, 3, Of the water supply developed within the watershed or im- ported thereto totaling 26,UOO acre-feet per season, 19,500 acre-feet are available for tise within the watershed and 6,900 acre-feet are for vae in areas outside the watershed, U« S\irface water supplies within the watershed are generally of good mineral quality except in the coastal area where saline tidal sloughs are found. The groxind water resources in the watershed also are generally of good mineral quality, except in the San Dieguito ground water basin where high concentrations of dissolved minerals are found along the -188- \v. coastal margin o Development of San Dieguito Basin has resulted in an over- draft on the limited supplies and has lowered ground water levels as much as i|0 feet below sea level, permitting the intrusion of salt water into the aquifer. 5o Except for the overdrawn San Dieguito ground water basin, where the present mean seasonal supplemental water requirement is about 800 acre-feetj present water requirements within the watershed are satisfied by the presently developed water supply, including imported Colorado River and San Luis Rey River water. Adequate local and imported water supplies are available to satisfy present water requirements of the City of San Diego o 6. Water requirements under probable ultimate conditions of land use will exceed the presently available water supply in all areas of the watershed except San Pasqual ground water basin, and supplemental water reqioirements in the watershed under these conditions would total about 137,000 acre-feet per season. 7- The current rapid growth of the City of San Diego is expected to continue in the future, accompanied by significant increases in water requirements. Increases in the City's mean seasonal water requirements, over and above the 1956-57 water requirements of about 71,000 acre-feet, are estimated to be approximately 59,000 acre-feet in 1970 and in excess of 100,000 acre-feet in I98O. 8. Under estimated conditions of ultimate development, only a minor portion of the water requirements in the watershed and in the City of San Diego can be met by local water resources, and, therefore, imported water supplies from the Colorado River Aqueduct, the Feather River and Delta Diversion Projects, and other uni-ts of The California Water Plan are essential. 9« Purchases of Colorado River water by the City of San Diego and other members of the San Diego County Water Authority presently exceed -189- their entitlement to this supply. When other member agencies of The Metro- politan Water District of Southern California purchase larger amounts of Colorado Pliver water, the City' s supply from this source will be reduced. 10. Conservation of present waste to the ocean from San Dieguito River watershed could be effected, in varying magnitudes and attendant costs, through implementation of the following plans : a. Increased utilization of ground water storage capacity in San Pasqual-Main Lake Hodges Basin. b. Addition of spillway gates on Sutherland Dam. c. Enlargement of San Vicente Reservoir. d. Construction of dams and reservoirs at the Pamo "F', San Pasqual, or Super Hodges sites. 11. The least costly method of conserving additional water in San Dieguito River watershed on a safe yield basis would be through utilization of UljOOO acre-feet of underground storage capacity in San Pasqual-Main Lake Hodges Basin, together with installation of spillway gates on Sutherland Dam. About 3 J 000 acre-feet of new water per season could be developed immediately in this manner, A new supply of water for the City of San Diego, in the amount of 6,200 acre-feet per season, could be made available under this plan, if the City continues its current program of land acquisition in the basin. This supply of water would include the 3,200 acre-feet per season -vdiich has pres- ently been developed and used on lands overlying and adjacent to San Pasqual- Main Lake Hodges Basin. 12 . The next least costly increment of additional jrield, to a maximum of 3,600 acre-feet per season, could be obtained by diversion of flood flows from Sutherland Reservoir to off -stream storage at an enlarged San Vicente Reservoir in the San Diego River watershed. 13. For incremental yields greater than 3,600 acre-feet per season, construction of a dam and reservoir within the San Dieguito River watershed -190- would be necessary, and such yields would have a lesser over-all and incre- mental \mit cost if they were developed wholely within the watershed rather than in conjunction with an enlarged San Vicente Reservoir, llio The cost of conserving water at a Super Hodges Reservoir is not competitive with that from either a San Pasqual or Pamo "B" reservoir, 15 o Unit costs of water developed at the Pamo "B" and San Pas- qual sites would be comparable, and such costs at both sites would decrease with increases in reservoir storage capacity considered herein,. Water could be conserved at a somewhat lesser unit cost at the San Pasqual site except for the smallest capacities investigated. However, if coordinate operation of surface and ground water storage were initiated at the San Pasqual site subsequent to planned development of the San Pasqual-Main Lake Hodges Basin, water supply facilities existing at that time within the reservoir area would require substantial modification, whereas^ no such modification would be necessary with a Pamo "B" Reservoir „ 16 „ Construction of a dam and reservoir at the San Pasqual site to the maximum practicable size, and operation of this reservoir in conjunc- tion with spillway gates on Sutherland Dam and with utilization of the ground water storage capacity underlying the reservoir area, would conserve about 60 per cent of present waste to the ocean from San Dieguito River, 17 o In semiarid San Diego County, where lengthy periods of drought are often experienced, five or ten years might elapse after completion of construction of surface storage facilities before the safe yield could be obtained. For that reason, further development of surface water supplies should be started well in advance of the need for those supplies . =191- 18. Yields and costs of the various plans of water development presented in this report are as follows: a„ San Pasqual-Main Lake Hodges Basin . Capital and annual costs of utilizing the maximum ground water storage capacity of Ul,000 acre-feet available in the San Pasqual-Main Lake Hodges Basin are esti- mated to be $6,163,700 and $316^100, respectively, including the cost of lands now owned by the City of San Diego and conveyance facilities. The estimated combined net safe seasonal additional yield to the City of San Diego from this operation would be about 5,800 acre-feet when operated coordinately with Hodges and Sutherland Reservoirs and with the "transfer of spill" operations between Sutherland and existing San Vicente Reser- voirs. The average annual unit cost of the developed supply would be about $5U per acre-foot. Deducting the value of lands and improvements now owned by the City of San Diego within the project area results in an estimated cost of about $3U per acre-foot of additional yield. b. Addition of Spillway Gates on Sutherland Dam . Addi- tion of 13-foot high spillway gates on Sutherland Dam would increase the reservoir capacity by 7,750 acre-feet and the estimated combined net safe yield of Sutherland and Hodges Reservoirs, when operated coordinately, from 9,100 acre-feet to 9,700 acre-feet per season under present condi- tions of ground water development and with the "transfer of spill" opera- tion between Sutherland and existing San Vicente Reservoirs. The estimated total capital cost of developing the 6OO acre-feet of new yield is $2lj3,500, and the average annual unit cost of new water would be about -192- i $21 per acre-footo When iiljOOO acre-feet of storage capacity in San Pasqual- Main Lake Hodges Basin are utilized in conjunction with spillway gates on Sutherland Dam, the resulting combined net safe seasonal yield of new water to the City would be 6^200 acre-feet and the average annual additional unit cost to the City of this yield wotild be $3U per acre-foot. c„ Enlarged San Vicente Reservoir , Increasing the height of San Vicente Dam by h2 feet and thereby increasing the storage capacity of the reservoir by k9 ^kOO acre-feet,, would provide an incremental seasonal yield of 3^600 acre-feet in excess of that which could be obtained from uti- lizing lilj,000 acre-feet of ground water storage capacity in San Pasqual-Main Lake Hodges Basin in conjunction with spillway gates on Sutherland Dam. This incremental yield could be developed at an additional average sjinual \init cost to the City of San Diego of $100 per acre-footo An enlarged San Vicente Reservoir operated coordinately with the foregoing facilities would provide a combined net safe seasonal yield of water to the City of San Diego of 9j800 acre-feet. The total capital cost is estimated to be $1145010^000,, and the average annual unit cost of water about $70 per acre-foot. If the value of lands and improvements now owned by the City of San Diego within San Pas- qual-Main Lake Hodges Basin is deducted from the project cost, the additional average annual cost to the City would be approximately $58 per acre-foot of yield, d„ Pamo "B" Reservoir . Three capacities for Pamo "B'' Reservoir were considered which would provide incremental seasonal yields ranging from 3^600 to 7j600 acre-feet in excess of that which coxild be obtained from utilization of Ul,000 acre-feet of ground water storage capacity in San Pasqual-Main Lake Hodges Basin, in conjunction with spill- way gates on Sutherland Dam, and with the "transfer of spill" operation -193- between Sutherland and existing San Vicente Reservoirs. These incremental yields could be developed at an additional average annual unit cost to the City of San Diego varying from $lU$ to $93 per acre-foot. Developments at the Pamo "B" site, operated coordinately with the foregoing facilities, would pro- vide a combined net safe seasonal additional yield to the City of San Diego ranging from 9^800 to 13,800 acre-feet. The estimated total capital costs wo\ild range from $17,295,100 to $21, 105,100, including the cost of convey- ance facilities. Average annual costs per acre-foot of additional yield wo\ild range between about $8? and $75 per acre-foot. If the value of lands and im- provements already owned by the City in the project area is deducted from the total costs, the additional average annual costs to the City would range between about $75 and $66 per acre-foot of additional yield. e, San Pasqual Reservoir . Three sizes of development at the San Pasqual site, including 3 7. .,000 acre-feet of ground water storage capa- city within the reservoir area, were considered which would provide incre- mental seasonal yields ranging from 2,500 to 12,200 acre-feet in excess of that which could be obtained from utilization of Ul,000 acre-feet of ground water storage capacity in San Pasqual-Main Lake Hodges Basin, in conjtinc- tion with spillway gates on Sutherland Dam, and with the "transfer of spill" operation between Sutherland and existing San Vicente Reservoirs, These incremental yields could be developed at an additional average annual unit cost to the City of San Diego varying from $199 to $76 per acre-foot. The three capacities of San Pasqual Reservoir combined with development of 37,000 acre-feet of ground water storage capacity within the reservoir area, spillway gates on Sutherland Dam, and with "transfer of spill" operation between Sutherland and existing San Vicente Reservoirs would provide a combined net safe seasonal additional yield to the City of San -19U- Diego ranging from 8^700 to l8j,i|00 acre-feet o The estimated total capital costs would range from $1$59685000 to $23s39l4j300<, including the cost of con- veyance facilities o Average annual costs per acre-foot of additional yield would range between about $91 and $6? per acre-foot „ If the value of lands and improvements already owned by the City in the project area is deducted from the total costs, the additional average annual costs to the City would range between about $81 and $62 per acre-foot of additional yield » f o Super Hodges Reservoir o Three capacities for Super Hodges Reservoir were considered^, which, combined with spillway gates on Sutherland Dam, and "transfer of spill" operation of Sutherland and existing San Vi- cente Reservoirs, would provide a combined net safe seasonal additional yield to the City of San Diego ranging from I|.s600 to 13,5O0 acre-feet „ The esti- mated total capital costs would range from $20,2 8$, 800 to $37,Oii9,100, in- cluding the cost of conveyance facilities „ Average annual costs per .agre-foot of additional yield would range between $215 and $135 per acre-foot o The cost of developing 1|1,000 acre=feet of ground water storage capacity within the reservoir area was not estimated as the new yield would not alter the co64-yield relationship for the Super Hodges project to such a degree as to render it competitive with alternative developments in the San Dieguito River watershed » If the value of lands now owned by the City within the project area and the cost of non-City modification of U. S. Highway No. 395 are deducted from the project cost, the additional average annual costs to the City would range between $160 and $101 per acre-foot of additional yield, 19 o Substantial flood control benefits would result from con- struction of the largest considered size of Pamo "B", San Pasqual, or -195- Super Hodges Dam by reduction of peak flows by reservoir surcharge stor- age only. On this basis, it is estimated that average annual benefits wovild be $93,500 for Pamo "B" Reservoir with a capacity of l63,iiOO acre- feet, $102,300 for San Pasqual Reservoir with a capacity of 335,000 acre-feet, and $1^0,000 for Super Hodges Reservoir with a capacity of 365,000 acre-feet. No appreciable flood control benefits in the San Die- guito River watershed would result from conservation effected by an enlarged San Vicente Reservoir. 20. Considerably greater benefits would accrue if credit were taken for reduction of peak flows in reservoirs from both sur- charge storage and storage space occurring 50 per cent of the time on April 1, On this basis, average annual benefits creditable to the lar- gest Pamo "F', San Pasqual, and Super Hodges Reservoirs would be $1195l;00, $222,000, and $2U6,500, respectively. 21. The present worth of the average annual benefits for the 365,000 acre-foot capacity Super Hodges Reservoir evaluated herein, considering, first, surcharge storage only and, secondly, surcharge storage combined with available storage space occurring 50 per cent of the tiJtne on April 1, is estimated to be $3,517,000 and $5,779,000, respectively. Recommendations 1, Plans for further development of the water resources of the San Dieguito River watershed be based upon conclusions of this investigation. -196- 2. Federal participation in the interest of flood control be sought in planning and implementation of water conservation development in the watershed. 3- The program of collection; compilation, and evaluation of basic hydrologic data throughout the San Dieguito River watershed be continued to provide a basis for accomplishing maximum practicable conservation of its water resources. h. Continuing effort be made to obtain adequate imported water supplies through the Feather River and Delta Diversion Projects and other units of The California Water Plan;, to augment the limited local water resources of San Diego County and available importations from the Colorado River. -197- y 1 I SAN DIEGUITO RIVER WATERSHED LOCATION MAP LEGEND '•'•I'l^^'. ^^^ DIEGUITO RIVER WATERSHED BOUNDARY HTOROUOGIC UNIT BOUNDARY SUBUNIT BOUNDARY NOTE: ANNEXATION DATA FURNISHED BY CITY OF SAN DIEGO OH SAN DIEGO COUNTY WATER AUTHORITY. STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PL/NNING SAN DIEGUITO RIVER INVESTIGATION HYDROLOGIC UNITS AND MAJOR WATER SERVICE AREAS SCALE OF MILES ^ f'^^^^f^ /"*g CALIFORNIA - "v f ■ ■ .. \v ,-o^ „....™™..™, .;^.^ ^^ LOCariON MAP SAN OlEGtilTO RIVER INVESTIGATION HYDR0L06IC UNITS AND MAJOR WATER SERVICE AREAS PLATE 2 I I -h X I LEGEND — •» SAN DIEGUITO RIVER WATERSHED BOUNDARY -■- HYDROLOGIC UNIT BOUNDARY — • SUBUNIT BOUNDARY MEAN SEASONAL NATURAL RUNOFF FROM, 1914-15 THROUGH 1936-57 • 98 A 30 A 42 LINES OF EQUAL MEAN SEASONAL PRECIPITATION IN INCHES FROM 1691-92 THROUGH 1940-41 PRECIPITATION STATION ACTIVE STREAM GAGING STATION INACTIVE STREAM GAGING STREAM STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL MEAN SEASONAL PRECIPITATION AND DIAGRAM OF MEAN SEASONAL NATURAL RUNOFF SCALE OF MILES PLATE 2 -h / \ LEGEND ^"^ -.^ SAN OlEGUITO RIVER WATERSHED BOUNDARY ^— -"-*. HYDROLOGIC UNIT BOUNDARY •■*-»• SUBUNIT BOUNDARY / MEAN SEASONAL NATURAL RUNOFF FROM, fi.Mot 1914-15 THROUGH 1996-57 • 9S ▲ 30 A 42 LINES OF EQUAL MEAN SEASONAL PRECIPITATION IN INCHES FROM 1691-92 THROUGH 1940-41 PRECIPITATION STATION ACTIVE STREAM GAGING STATION INACTIVE STREAM GAGING STREAM STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION / LINES OF EQUAL MEAN SEASONAL PRECIPITATION • AND * DIAGRAM OF MEAN SEASONAL NATURAL RUNOFF SCALE OF MILES - / / LINES OF EQUAL MEAN SEASONAL PRECIPITATION \ { •NO ^ DIAGRAM OF MEAN SEASONAL NATURAL RUNOFF SAN DIE6UIT0 RIVER INVESTIGATION PLATE 3 RUNOFF PARTIALLY REGULATED BY SUTHERLAND RESERVOIR FROM 1953-54 THROUGH l956-57_ ± I DIE6UIT0 RIVER AT LAKE HODGES kN DIEGUITO RIVER AT LAKE HODGES I I I I I ACCUMULATED DEPARTURE FROM MEAN SEASONAL PRECIPITATION AT ESCONDIDO ^^H •tI<»DCO KUXO" 1D0> ■UlIll.L DH •E9EI>VDLa [ZD • ■ -• ."■.-.".-..■ ^ :rr:,'.""';.";,;;:r.'" n n h 1 r nOn „n n„n n nn n ll.. .. 1 ..i.li •■ UlIllM_ ~r ESTIMATED AND RECORDED SEASONAL ACTUAL RUNOFF OF SAN OIEGUITO RIVER AT LAKE HODGES ACCUMULATED DEPARTURE FROM MEAN SEASONAL ACTUAL RUNOFF OF SAN DIEGUITO RIVER AT LAKE HODGES REPRESENTATIVE CHARACTERISTICS OF SEASONAL PRECIPITATION AND RUNOFF IN SAN DIEGUITO RIVER WATERSHED PLATE 4 LEfiEND >"""«««» SAN DIESUITO RIVER WATERSHED BOUNDARY ^■"•^.^ HYDR0L06IC UNIT BOUNDARY GROUND WATER BASIN BOUNDARY • CI LOCATION OF WELL A 3 LOCATION OF SURFACE SAMPLING STATION US- LAND SURVEY SECTION LINE- FROM U.S.G.S. QUADRANGLE US. LAND SURVEY SECTION LINE- PROJECTED WATER-BEARING CHARACTERISTICS OF GEOLOGIC FORMATIONS l^^^^^ i) HIGH TO MODERATE PERMEABILITY RECENT ALLUVIUM; PRINCIPAL SOURCE OF GROUND WATER. NUMEROUS IRRIGATION AND DOMESTIC WELLS. MODERATE TO LOW PERMEABILITY RESIDUUM AND ALLUVIUM; NUMEROUS DOMESTIC WELLS AND ONLY A FEW IRRIGATION WELLS. LOW PERMEABILITY EOCENE SEDIMENTARY FORMATIONS: FEW DOMESTIC AND STOCK WELLS. GENERALLY IMPERMEABLE IGNEOUS AND METAMORPHIC ROCKS; PRACTICALLY NONWATER-BEARING, BUT LIMITED QUALITIES OF WATER OBTAINED FROM JOINTS AND FRACTURES, AND HIGHLY WEATHERED ZONES. \ KEY TO NUMBERING SYSTEM TYPICAL LAND SECTION h-.. A V-i U F r H M L K J N p a ft i cc WELLS SHOWN ARE NUMBERED BY TOWNSHIP, RANGE, AND SUBDIVISION OF SECTION a.g., TtES/RIW-36CI T.I2S. ">'■ TI3S. uj cr! STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LOCATION OF GROUND WATER BASINS. WELLS AND SURFACE SAMPLING STATIONS SCALE OF MILES 1/2 PLATE 4 >i I ■--,• y r--- r''- TI3S. iij 5 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LOCATION OF GROUND WATER BASINS. WELLS AND SURFACE SAMPLING STATIONS SCALE OF MILES 1/2 /rs PLATE 5 1 Qal 1 1 Od 1 1 Qr 1 1 Tepc 1 1 Telj 1 LEGEND ALLUVIUM SAND. GRAVEL AND CLAY WATEfi-BEARlNG. BEACH AND DUNES SAND. PERMEABLE BUT ABOVE WATER SURFACE. RESIDUUM DECOMPOSED ROCK RESEMBLING CLAYEY SAND WATER-BEARING POWAY CONGLOMERATE GRAVEL WITH SANDSTONE AND CLAY LENSES SEMI-PERMEABLE BUT GENERALLY ABOVE WATER SURFACE. LA JOLLA FORMATION SANDSTONE. SILTSTONE. SHALE ,CLAY. SOME LIMESTONE AND MINOR GRAVEL LENSES SEMI-PERMEABLE WATER QUALITY POOR -rr 1 LEUCOGRANODIORITE KIQ FRACTURES YIELD WATER — ' TO DOMESTIC WELLS '-rz — — 1 GRANODIORITE Kar ' FRACTURES YIELD WATER ^ ' TO DOMESTIC WELLS. J<1. iMi mn if V'.: A A' TONALITE DEEP POCKETS OF RESIDUUM COMMON FRACTURES YIELD WATER TO DOMESTIC WELLS GABBRO FRACTURES YIELD WATER TO DOMESTIC WELLS. JURASSIC SLATES NOT PENETRATED BY WELLS STONEWALL GRANODIORITE ASSOCIATED WITH SCHISTS. QUARTZITE AND HYBRID GNEISSES (JURASSIC). NOT PENETRATED BY WELLS SANTIAGO PEAK VOLCANICS FRACTURES YIELD WATER TO DOMESTIC WELLS INTRUSIVES RELATED TO SANTIAGO PEAK VOLCANICS FRACTURES YIELD WATER TO DOMESTIC WELLS BEDFORD CANYON FORMATION AND JULIAN SERIES METASEDIMENTS WELLS NOT KNOWN TO PENETRATE THIS UNIT WATERSHED BOUNDARY GEOLOGIC CONTACT-DEFINITE GEOLOGIC CONTACT APPROXIMATE FAULT-DEFINITE FAULT -APPROXIMATE FAULT-CONCEALED LINE OF GEOLOGIC SECTION ■ + STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION A R E A L "Te L G Y SC4LE OF MILES PLATE 5 LEGEND -, , I ALLUVIUM UOl 1 SAND. GRAVEL AND CLAY WATER-BEARING, _ . I BEACH AND DUNES Cjd SAND PERMEABLE BUT ABOVE WATER SURFACE. RESIDUUM DECOMPOSED ROCK RESEMBLING CLAYEY SAND WATER-BEARING. POWAY CONGLOMERATE GRAVEL WITH SANDSTONE AND CLAY LENSES, SEMI-PERMEABLE BUT GENERALLY ABOVE WATER SURFACE. LA JOLLA FORMATION SANDSTONE. SILTSTONE. SHALE .CLAY. SOME LIMESTONE AND MINOR GRAVEL LENSES SEMI-PERMEABLE WATER QUALITY POOR , LEUCOGRANODIORITE KIQ FRACTURES YIELD WATER — ' TO DOMESTIC WELLS .,, I GRANOOIORITE Kar ■ FRACTURES YIELD WATER - — ' ' TO DOMESTIC WELLS. TONALITE DEEP POCKETS OF RESIDUUM COMMON FRACTURES YIELD WATER TO DOMESTIC WELLS GABBRO FRACTURES YIELD WATER TO DOMESTIC WELLS, JURASSIC SLATES NOT PENETRATED BY WELLS. STONEWALL GRANODIORITE ASSOCIATED WITH SCHISTS, QUARTZITE AND HYBRID GNEISSES (JURASSIC). NOT PENETRATED BY WELLS SANTIAGO PEAK VOLCANICS FRACTURES YIELD WATER TO DOMESTIC WELLS INTRUSIVES RELATED TO SANTIAGO PEAK VOLCANICS Dt'-N^ FRACTURES YIELD WATER TO DOMESTIC WELLS BEDFORD CANYON FORMATION AND JULIAN SERIES METflSEDlMENTS WELLS NOT KNOWN TO PENETRATE THIS UNIT WATERSHED BOUNDARY GEOLOGIC CONTACT-DEFINITE GEOLOGIC CONTACT APPROXIMATE FAULT-DEFINITE FAULT -APPROXIMATE FAULT-CONCEALED LINE OF GEOLOGIC SECTION A' STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION AREAL GEOLOGY SCALE OF MILES _< 2 I I I I I ran ""^s~ ran ■'"«!;,-« ED ■^'KS.-Si"" E^ "KSH,',."ia.-" CID "a|.;gjsr."iS«i"-~ CE3 "'isaiisKw— "• Bl ESS "lSf«S5«a«''« ^ "•i!s';?3"-"- FSfl ■•«i!'HS?»«"""""" SAN DIEGUITO RIVER INVESTIGATION AREAL GEOLOGY PLATE 6-A UNDIFFERENTIATED EOCENE FORMATIONS EAST T + lOO A" STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION GEOLOGIC SECTIONS A-A', B-B', AND C-C PLATE 6-A EAST -1 + 100 UNDIFFERENTIATED EOCENE FORMATIONS STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION GEOLOGIC SECTIONS A-A', B-B', AND C-C PACIFIC OCEAN I n— Z ID 9 I J. J- Al PLATE 6-a * S UNDIFFERENTIATED EOCENE FORMATIONS SECTION A- A SAN DIEGUITO BASIN UNDIFFERENTIATED EOCENE FORMATIONS p WEST "<« EAST -|H « n " n _ N - \ ' ' Z £ 5 ; \ M S ! i ' 5 S \ '- i i ? s ! y \ 1 1 1 GROUND , SURFACE 1 1 1 '^' \ \ \ j |i ^ il 1 \ \ \ J u ^ ALLUVIUM f / / / . \ ^ L r= L / \ -= ; / . -. E^ / UNOIFFERENTIATEO DCENE FORMATIONS SECTION B-B' SAN DIEGUITO BASIN LEGEND lEiia »- ^=L:j SANDY CLAt, OR SILT I I ""» GnAVEL C SECTION C-C C SAN DIEGUITO BASIN SAN DIEGUITO RIVER INVESTIGATION GEOLOGIC SECTIONS A-A', B-B', AND C-C PLATE 6^B EAST UNDIFFERENTIATED GRANITIC ROCK 300 D' 200 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION GEOLOGIC SECTIONS D-D", E-E; and F-F' SCALE OF FEET KXIO 2000 3000 PLATE 6-B < ti » n ^ ^ « S N EAST-, UNDIFFERENTIATED GRANITIC ROCK 400 300 D' I STATE OF CALIFORNPA DEPARTMENT OF WATER RESOUF?CES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION geologic sections D-d; e-e; and F-F' SCALE OF FEET 1000 1000 2000 3000 i LIKE HODOES SAN PASCUAE SECTION 0-D' LAKE HODGES AND SAN PASQUAL BASINS I60O I- NOI»TMWESTEAeT 50UTHEASTERLV -i 1600 SECTION E-E' SAN PASQUAL BASIN BBg - ESI' SHOWN ON 0LATC S SECTION F-F RAMONA BASIN DEPARTMENT OF WATER RESOUBCES OrjitiffN or KUOUBCCS ■ujwmo SAN DIEGUITO RIVER INVESTIGATION geologic sections o-d; e-e; and F-F' r^ PLATE 7 -A 6CHO0 80*00 DS OF FEET 500 475 450 •es 400 375 350 STATE OF CALrFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN PASOUAL BASIN PLATE 7 -A LEGEND (PLAN ONLY) SflN OIEGUITO RIVER WATERSHED BOUNDARY GROUND WATER BASIN BOUNDARY LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS, SPRING 1952 LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 (PROFILE ONLY) FALL OF 1951 SPRING OF 1952 . FALL OF 1957 - 500 475 450 425 400 375 6000 8O*00 ' Ids OF FEET STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN PASQUAL BASIN st= PLATE 7 -A IPKN OMLTI S&N DIEGUITO RIVEn WATERSHED BOUNDARY GROUND WATER SASIN BOUNDARY PWflLE ONLTl FALL OF 1951 - SPRING OF 1952 _ FALL OF 1957 - (ZOtOO (40*0O 160.00 186166 STATIONING £60*66 SSdIod aMtOO HUNDREDS OF F£eT 2661-66 260*00 300«00 320*00 540 tOO 400*00 417.00 BftCH CANYON 0»00 20KX) 40*00 60K» B0*00 IOOM» I20rt)0 STATIONING IN HUNDREDS OF FEET ROCKWOOD CANYON ' 0.00 20H30 STATIONING I 4O*0O 60*O0 HUNDREDS OF FEET DEPARTMENT OF WATER RESOURCES SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN PASQUAL BASIN PROFILES PLATE 7- I \ /' LEGEND ( PLAN ONLY 1 TI3S T.I4S. ^" "" SAN DIEGUITO RIVER WATERSHED BOUNDARY i^^^^^uM. GROUND WATER BASIN BOUNDARY ---20— LINE OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 I , AREA UNDERLAIN WITH GROUND WATER HAVING 1 1 A CHLORIDE ION CONCENTRATION RANGING ' ' ' FROM 0-250 PARTS PER MILLION. AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION RANGING FROM 250-1000 PARTS PER' MILLION. AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION IN EXCESS OF 1000 PARTS PER MILLION. SPRING OF 1957 . FALL OF 1957- :■] (PROFILE ONLY ) PROFILE OF GROUND WATER LEVELS SI* Kievi a:\ic _l STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN DIEGUITO BASIN PLATE 7- -V-: \ /' I TI3S. T.I4S. LEGEND ( PLAN ONLY ] ^" — " SAN DIEGUITO RIVER WATERSHED BOUNDARY •"-"^^JJJi GROUND WATER BASIN BOUNDARY ^-20— LINE OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 , 1 AREA UNDERLAIN WITH GROUND WATER HAVING I A CHLORIDE ION CONCENTRATION RANGING ' ' FROM 0-250 PARTS PER MILLION. AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION RANGING FROM 250-1000 PARTS PER' MILLION. AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION IN EXCESS OF 1000 PARTS PER MILLION- SPRING OF 1957 . FALL OF 1957- (PROFILE ONLY) PROFILE OF GROUND WATER LEVELS 3:1* meg Q:[a: _l STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN DIEGUITO BASIN M LEGEND ( PUftN ONLTl ^» w^ SAN OlESUITO RIVER WATERSHED BOUNDARY ^^-'■'^JJ.UJ. GROUND WATER BASIN BOUNDARY AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION HANGING FROM 0-2S0 PARTS PER MILLION, AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION RANGING FROM 250-1000 PARTS PER" MILLION, AREA UNDERLAIN WITH GROUND WATER HAVING A CHLORIDE ION CONCENTRATION IN EXCESS OF 1000 PARTS PER MILLION. (PHOFILE ONLI ) PROFILE OF GROUND WATER LEVELS STATE OF CALIFORMA DEiPARTMENT OF WATEIR RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION AND PROFILES OF GROUND WATER LEVELS SAN DIEGUITO BASIN I40*-00 STATIONI HUNDREDS OF FEET PROFILE PLATE 7-C LOCATION MAP LEGEND "-'-aiX»'- GROUND WATER BASIN BOUNDARY 1400^ LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS RAMONA BASIN 1/2 Is SCALE OF MILES PLATE 7-C LOCATION MAP I LEGEND ^^■Uuii^^ GROUND WATER BASIN BOUNDARY 1400. ^'"^5 °' EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIE6UIT0 RIVER INVESTIGATION LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS RAMONA BASIN 1/2 SCALE OF MILES -I ^— LOCATION MAP LEGEND ^^^AUl**^ GROUND WATER BftSiN eOUNOARY SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS RAMONA BASIN SCALE OF MILES PLATE 7-D I LOCATION MAP ,^600 — LEGEND SAN DIEGUITO RIVER WATERSHED BOUNDARY GROUND WATER BASIN BOUNDARY LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 + STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS FELICITA AND LAKE HODGES BASINS SCALE OF MILES 1/2 PLATE 7-D LOCATION MAP ,— 600 — LEGEND SAN DIEGUITO RIVER WATERSHED BOUNDARY GROUND WATER BASIN BOUNDARY LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS, FALL 1957 + STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL ELEVATION OF GROUND WATER LEVELS FELICITA AND LAKE HODGES BASINS SCALE OF MILES I 1/2 PLATE 7-D ^ LOCATION MAP ^■M^^ SAN DIEQUITO RIVER WATCRSHCD BOUNOAnv Ui.UuJ>^ GROUND WATER BASIN SOUNOARir + DEPARTMENT OF WATER RESOURCES oiviauij,UjJ>^ LEGEND WATERSHED BOUNDARY GROUND WATER BASIN BOUNDARY LINES OF EQUAL NET CHANGE IN GROUND WATER LEVEL ELEVATION 13 S. ^lATC Of CAtlfOHNIA DEPARTMENT OF V\/ATER RESOURCES DIVISION OF RESOURCFS PLANNING SAN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL NET CHANGE IN GROUND WATER LEVEL ELEVATION SPRING 1952 TO FALL 1957 SAN PASQUAL BASIN 1/2 SCALE OF MILES DEPARTMENT OF WATER RESOURCES SflN DIEGUITO RIVER INVESTIGATION LINES OF EQUAL NET CHANGE IN GROUND WATER LEVEL ELEVATION SPRING 1952 TO FALL 1957 SAN PASQUAL BASIN SAN DIEGUITO BASIN F WATER LEVELS IN WELL I4S/4W- IQI AND TIDAL FLUCTUATIONS WELL I4S/4W-4Q1 PLATE 9 GROUND SURFACE ELEVATION 10 30 31 JAN 1,1957 TIDAL GAGE HEIGHT GRAPH 29 30 DAY 31 JAN, 1, 1957 NOTE; LOCATION OF WELLS SHOWN ON PLATE 4 FLUCTUATION OF WATER LEVELS AT SELECTED WELLS "f" INDICATES PERIOD DURING WHICH WELL FLOWED "PR" INDICATES PUMP RUNNING WHEN OBSERVER MEASURED DEPTH TO WATER PLATE 9 SAN DIEGUITO BASIN F WATER LEVELS IN WELL I4S/4W- IQI AND TIDAL FLUCTUATIONS WELL I4S/4W-4QI GROUND SURFACE ELEVATION 10,0 31 JAN 1,1957 TIDAL GAGE HEIGHT GRAPH 29 30 DAY JAN, 1, 1957 2 NOTE; LOCATION OF WELLS SHOWN ON PLATE 4 FLUCTUATION OF WATER LEVELS AT SELECTED WELLS "f" indicates period during which well FLOWED "PR" indicates pump running when observer MEASURED DEPTH TO WATER RAMONA BASIN SAN PASQUAL BASIN SAN DIEGUITO BASIN COMPARISON OF WATER LEVELS IN WELL I4S/4W- 101 AND TIDAL FLUCTUATIONS \ -1 ^v M SAN PASQUAL BASIN SWUNO SUBFACE ELE-iTW ] 1 ' \ ', ', \ \ V I \ L \ \ \ \ \ \ 1 \ \ \ No , " «^ ,% ts. HO NECORb 1 ^ Nr, h \ \ i-'H." V '"' \ <\ ■- ^ V^-v-X \ V "\ \ '\ i *"-'V SAN PASQUAL BASIN SN r,.'.' ecoE ST 0* ■;;.; ,>■'„ •r >AN PaSQUOL B4SIN .... ,.,„ eviTioi N 969 1' r 1 .. ..<». 1 ^ k. rt fsf ^^| [A,|ji^y'v--v^J«^ ../ OHOUNO iUBFiCE EHV»TltW 396 2' CnOUHC iUBFACE ELEVITIO". 1694 COSO tlO BECOnO ^^' \ ■ V V.'^^ v^ 'V J:"'^'^^X\ fVf.-V/^^^ OLO »H MMUIL SCHOOL • V,., l^/ \I „ ^ 1 T"'i" 1 ^ SAN DIEGUITO BASIN 1 V \^ -^ «„„.. " " » " '• « «, >. .„,,«. = . . . A A A A A f\f\ n^ M A a A /^ ^-^u A 4 'A ^ N\ / I / \ /^ / ' \ j^f^ TIDAL GAGE HEIGHT GRAPH _, ^ 1 r> p- ]p A A A L A, r X TT ^1^ V, \A^ u ' f f ^ m \ ^ V A \A/ J i^ ^ LI V J - V V V V V L — *- FLUCTUATION OF WATER LEVELS AT SELECTED WELLS ' VBTEB BESOUBCES PLATE 10 T I 1 I I I I I I I I I rn I I I I I I I I I 1 I I I I I — \ — 1 — I — I — I — I I — r )F ENTIRE BflSIN. INCLUDING SIDE CANYONS 395' )F MAIN BASIN 390 ^ESTIMATED MAXIMUM PRACTICABLE DEPLETION UNDER PLANNED BASIN OPERATION i 40 4 5 50 5 5 .ETION IN THOUSANDS OF ACRE-FEET 60 65 70 75 ^GE WATER LEVEL ELEVATION STORAGE DEPLETION PLATE 10 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 40 45 50 55 60 65 70 75 .ETION IN THOUSANDS OF ACRE-FEET I I I I I — I I I I I — I I I I I — I I I I I — I I I I pF ENTIRE BASIN, INCLUDING SIDE CANYONS 35' 40 45 50 55 60 65 ETION IN THOUSANDS OF ACRE-FEET 70 75 ^GE WATER LEVEL ELEVATION STORAGE DEPLETION 425 400 ~I-T 1 1 1 1 1 1 " T~ T T 1 1 1 1 I 1 1 1 1 ■Till 1 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1 1 r-j—i— 1 1 1 1 1 1 1 1 1 1 1 I- .(-—■AVERAGE GROUND SURFACE ELEVATION OF ENTIRE BASIN. INCLUDING SIDE CANYONS 395' ,- — AVERAGE GROUND SURFACE ELEVATION OF MAIN BASiN 390' 375 350 325 5 •1 O 300 z> 1 275 Z o < 225 ^^^ ,,,,_^^ - " ^ DEPLETI0^ -FALL 1 957 ; : s!^^|^*"^ ^^H \ ^*ESTIMflTED MAXIMUM PRACTICABLE DEPLETION UNDER y^l PLANNED BASIN OPERATION 1 f 1 1 1 1 ; - <^ t& - - MAIN BASIN-^ ^■^^ ^ ENT RE BASIN INCLUDING SIDE CANYONS - - - - SAN PASQUAL BASIN \; 1 1 1 1 rill 1 1 1 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 till 1 1 1 1 1 1 1 1 1 1 1 1 i I 1 1 1 i i 1 25 30 35 40 45 50 6 5 GROUND WATER STORAGE DEPLETION IN THOUSANDS OF ACRE-FEET 60 65 70 75 a + 25 1 r I T - 1 1 1 1 1 1 1 1 1 1 1 1 I 1 1 1 1 I [-T-r- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ^ — AVERAGE GROUND SURFACE ELEVATION OF ENTIRE BASIN, INCLUDING SIDE CANYONS 35' 1 1 1 1 I 1 1 I 1 1 1 1 < 5 - 1 1 1 1 1 1 ^^— AVERAGE GROUND SURFACE ELEVATION OF MAIN BASIN 25' - o z =) o a o ^ ^5^ ■-~- - - "~<^ ^^DEPLETION-FALL 1957 MEAN SE < " ^^ ^t:;:;^. - > -25 - ^ ■-^^!^^]*~-~-^ - - "--N ■^ ^/^ ENTIRE B ISIN INCLU IING SIDE ;anyons - -50 - MAIN jasin'^ - - "».^^ " _ - V ^**"^^ _ " ^•v^^ - -75 " - - -100 - SAN D EGUITO BASIN *s^ - - \ \ - -125 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ,111 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 > 25 30 35 40 45 50 55 60 65 70 75 GROUND WATER STORAGE DEPLETION IN THOUSANDS OF ACRE-FEET RELATIONSHIP BETWEEN AVERAGE WATER LEVEL ELEVATION AND GROUND WATER STORAGE DEPLETION DEPARTMENT OF WATER RESOURCES PLATE II y / --- '«-', ^■9/ t. 7/ i \ "^- LEGEND PRESENT CONDITIONS (1956-571 IRRIGATED H URBAN AND SUBURBAN PROBABLE ULTIMATE CONDITIONS I IRRIGABLE VALLEY LAND I IRRIGABLE HILL LANDS POTENTIAL URBAN AND SUBURBAN POTENTIAL URBAN LANDS PRSENTLY IRRIGATED STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PRESENT AND PROBABLE ULTIMATE LAND USE SCALE OF MILES I I E 3 I >-, J y / --- PLATE II ^ *,'«: Vr-'Oo ; fe/. \ 7; 1 "^- LEGEND PRESENT CONDITIONS (1956-571 IRBIGflTED ^^^H URBAN AND SUBURBAN PROBABLE ULTIMATE CONDITIONS I I IRRIGABLE VALLEY LAND j IRRIGABLE HILL LANDS \^/^y^ POTENTIAL URBAN AND SUBURBAN POTENTIAL URBAN LANDS PRSENTLT IRRIGATED STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PRESENT AND PROBABLE ULTIMATE LAND USE SCALE OF MILES CD- SAN OIEGUITO RIVER INVESTtGATION PRESENT AND PROBABLE ULTIMATE LAND USE PLATE 12 LEGEND SAN DIEGUITO RIVER WATERSHED BOUNDARY PROBABLE FUTURE BOUNDARY OF CITY OF SAN DIEGO WATER SERVICE AREA, ESTIMATE FURNISHED BY CITY OF SAN DIEGO. MIRAMAR SERVICE AREA VIA ALVARADO SERVICE AREA LOWER OTAY SERVICE AREA LOWER OTAY SERVICE AREA INITIALLY ALVARADO SERVICE AREA ULTIMATELY IRRIGABLE VALLEY LANDS IRRIGABLE HILL LANDS POTENTIAL URBAN AND SUBURBAN LANDS MILITARY RESERVATIONS NOT CLASSIFIED AS POTENTIAL URBAN OR SUBURBAN LANDS NOTE: PATTERN OF ULTIMATE LAND USE BASED ON DATA FROM STATE DEPARTMENT OF WATER RESOURCES BULLETIN NO- 61 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PROBABLE ULTIMATE LAND USE IN SAN DIEGUITO RIVER WATERSHED AND FUTURE WATER SERVICE AREAS OF CITY OF SAN DIEGO SCALE OF MILES 2 PLATE 12 LEGEND SAN DIEGUITO RIVER WATERSHED BOUNDARY PROBABLE FUTURE BOUNDARY OF CITY OF SAN DIEGO WATER SERVICE AREA, ESTIMATE FURNISHED BY CITY OF SAN DIEGO. MIRAMAR SERVICE AREA VIA ALVAHAOO SERVICE AREA LOWER OTAY SERVICE AREA LOWER OTAY SERVICE AREA INITIALLY ALVARADO SERVICE AREA ULTIMATELY IRRIGABLE VALLEY LANDS IRRIGABLE HILL LANDS POTENTIAL URBAN AND SUBURBAN LANDS MILITARY RESERVATIONS NOT CLASSIFIED AS POTENTIAL URBAN OR SUBURBAN LANDS NOTE: PATTERN OF ULTIMATE LAND USE BASED ON DATA FROM STATE DEPARTMENT OF WATER RESOURCES BULLETIN NO. 61 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PROBABLE ULTIMATE LAND USE IN SAN DIEGUITO RIVER WATERSHED AND FUTURE WATER SERVICE AREAS OF CITY OF SAN DIEGO SCALE OF MILES 2 2 4 6 > LEGEND *■■*■■*" SAN DIEGUITO RIVER WflTERSMED eOUNDARY .^.^_ PROBABLE FUTURE BOUNDARY OF CITY OF SAN DIEGO WATER SERVICE AREA, ESTIMATE FURNISHED BY CITY OF SAN 01EG0. J MIHAMAR SERVICE AREA \/y/\ ALVARftOO SERVICE AREA [\\\j LOWER OTAY SERVICE AREA LOWER OTAY SERVICE AREA INITIALLY ALVARADO SERVICE AREA ULTIMATELY IRRIGABLE VALLEY LANDS IRRIGABLE HILL LANDS POTENTIAL URBAN AND SUBURBAN LANDS MILITARY RESERVATIONS NOT CLASSIFIED AS POTENTIAL URBAN OR SUBURBAN LANDS NOTE- PATTERN OF ULTIMATE LAND USE BASED ON DATA FROM STATE DEPARTMENT OF WATER RESOURCES BULLETIN NO 61 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PROBABLE ULTIMATE LAND USE IN SAN DIEGUITO RIVER WATERSHED AND FUTURE WATER SERVICE AREAS OF CITY OF SAN DIEGO SCALE OF MILES LE FUTURE WATER REQUIREMENTS OASTAL SAN DIEGO COUNTY ELD OF EXISTING DEVELOPMEN \\\\.\\\ \\\.\l\\\ AWWWWWKW \\\\\ \\\\ WW l-IELD OF EXISTING FACILITIES .\\\\\\\\ \W\\ \\.\ ,\\\l\.\,\ .\ \ \l \,\,\XWX\.\\X\\\.\X1 LE FUTURE WATER REQUIREMENTS R SERVICE AREA OF CITY OF SAN DIEGO REQUIREMENTS PEAS OF CITY OF SAN DIEGO \ REQUIREMENTS AND LOCAL AFFECTING CITY OF SAN DIEGO PLATE 13 ELD OF EXISTING DEVELOPMEN LE FUTURE WATER REQUIREMENTS OASTAL SAN D1E60 COUNTY \\\\\\\\\\\K\\ nELD OF EXISTING FACILITIES. ■ \ \.\ ,\ \\l\.\ ,\ .\ \ \l \.\.\X \\\^\^^\xN LE FUTURE WATER REQUIREMENTS ? SERVICE AREA OF CITY OF SAN DIEGO REQUIREMENTS PEAS OF CITY OF SAN DIEGO t REQUIREMENTS AND LOCAL AFFECTING CITY OF SAN DIEGO KOTt OAT> OH BtTER OEOUIAEHCMT' «M0 SUPPLt OBTAINED mow ■ n BULL HO SI REQUIREMENTS FIRST EXCEED SUPPLY , WATER REQUIREMENTS - RELATIONSHIP BETWEEN PROBABLE FUTURE WATER REQUIREMENTS AND WATER SUPPLY OF COASTAL SAN DIEGO COUNTY o ^ c o - suppL' 'ufiNisMEO a» CITY or S*N OIEOO WATER REQUIREMENTS — . ry-..^ REQUIRE .1ENTS FIRST EED SUPPLY V ^ '/Vl,;-* \ ^ .\\\W\W\\^ SUPPLY FROM LOCAL SAFE YIELD OF EXISTING FACILITIES \XX\\\l\.\X\\ V. \,\.\ .S \ -V N. \.\.N A \ ^ V.\ X \\l\.\ .\ .N \ \1 \,\,', V . , . . V , „ ,, RELATIONSHIP BETWEEN PROBABLE FUTURE WATER REQUIREMENTS AND WATER SUPPLY OF FUTURE WATER SERVICE AREA OF CITY OF SAN DIEGO IS - z - note: cat* on import water reouibements furhisheo By city Of SAH 0.E6O TO "AL SERVICE AREA-^ ^^^^ - -——-'■'■ — ^ ALVAHADO RVICE AREA->^ MIRAMAR SERVICE AREA-^ ^ i :.- s^^^id ^ — __ , - - " LOWER OTAY SERVICE AREA--,,^^ IMPORT WATER REQUIREMENTS OF FUTURE WATER SERVICE AREAS OF CITY OF SAN DIEGO RELATIONSHIP BETWEEN WATER REQUIREMENTS AND LOCAL AND IMPORTED WATER SUPPLIES AFFECTING CITY OF SAN DIEGO DEPARTMENT OF WATER RESOURCES I PLATE 14 LEGEND SAN DIEGUITO RIVER WATERSHED BOUNDAI'.V PROBABLE FUTURE BOUNDARY OF CITY OF SAN DIEGO WATER SERVICE AREA AS FURNISHED BY CITY OF SAN DIEGO, MAJOR EXISTING WATER SUPPLY FACILITIES OF CITY OF SAN DIEGO. POTENTIAL FACILITIES FOR DEVELOPMENT OF WATER RESOURCES IN SAN DIEGUITO RIVER WATERSHED PROSPECTIVE FACILITIES OF THE CALIFORNIA WATER PLAN AFFECTING SAN DIEGUITO WATERSHED. STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION EXISTING AND POTENTIAL ALTERNATIVE FACILITIES FOR WATER SUPPLY DEVELOPMENT IN SAN DIEGUITO RIVER WATERSHED AND MAJOR RELATED WORKS SCALE OF MILES 5 PLATE 14 LEGEND SaN DIEGUITO RIVER WATERSHED BOUNDfll'.v PROBiBLE FUTURE BOUNDiRY OF CITY OF SAN DIEGO WATER SERVICE AREA AS FURNISHED BY CITY OF SAN DIEGO. MAJOR EXISTING WATER SUPPLY FACILITIES OF CITY OF SAN DIEGO. POTENTIAL FACILITIES FOR DEVELOPMENT OF WATER RESOURCES IN SAN DIEGUITO RIVER WATERSHED PROSPECTIVE FACILITIES OF THE CALIFORNIA WATER PLAN AFFECTING SAN DIEGUITO WATERSHED. STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION I EXISTING AND POTENTIAL ALTERNATIVE FACILITIES FOR WATER SUPPLY DEVELOPMENT IN SAN DIEGUITO RIVER WATERSHED AND MAJOR RELATED WORKS SCALE OF MILES 5 ^lSMIZ^'4- SiN DIEGUITO RIVER WATEBSMEO BOUNDfll-v PROBABLE FUTURE BOUNDARY OF CITY OF SAN DIEGO WATER SERVICE AREA AS FURNISHED BY CITY OF SAN OlECO, POTENTIAL FACILITIES FOR DEVELOPMENT OF WATER RESOURCES IN SAN OIEGUITO RIVER WATERSHED PROSPECTIVE FACILITIES OF THE CALIFORNIA WATER PLAN AFFECTING SAN OIEGUITO WATERSHED ^ X STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION EXISTING AND POTENTIAL ALTERNATIVE FACILITIES FOR WATER SUPPLY DEVELOPMENT IN SAN DIEGUITO RIVER WATERSHED AND MAJOR RELATED WORKS SCALE OF MILES PLATE 15 '■_ / -, / '■_ / \ / —_ y 2, — : ill ^\^ ►- a. y\'h. 60 "" u X% ? u^ / Vf^ a / NO^ 5 5 1 V - 70 % X / O / Z 3 a / X / 80 Z. < / \ ^ o / \ -^ ■ a. 4 / 90 ° Q < a y / / \ - > 100 •=■ s / / \ •a 2 / \ < ^ 3 - / \ ^ "0 !;; / \ 120 / 4/ 2 4^ 130 ILLUSTRATIVE EXAMPLE -y when: average DEPTH to WATER = 71 FT "^ (1) STORAGE DEPLETION = 41,000 AC-FT — 140 V tZ) TOTAL SAFE YIELD = 6,000 AC-FT PER YR / (3) NEW YIELD = 2^00 AC-FT PER YR / (4) PRESENTLY DEVELOPED YIELD = 3.200 AC-FT PER YR " 150 / , ... 1 .... 1 .,,. 1 ..,,,.,,. 1 ,,,. : 160 '° 20 30 40 50 60 70 ESTlMflTED STORAGE DEPLETION IN THOUSANDS OF ACRE- FEET RELATIONSHIP BETWEEN GROUND WATER STORAGE DEPLETION, YIELD, AND AVERAGE DEPTH TO GROUND WATER IN SAN PASQUAL AND MAIN LAKE HODGES BASINS FOR THE PERIOD FROM 1914-15 THROUGH 1956-57 ADJUSTED FOR PRESENT CONDITIONS DEPARTMENT F WATER RESOURCES PLATE 16 LOCATION MAP ^- LEGEND ^^»» SflN DIEGUITO RIVER WATERSHED BOUNDARY ^" ' " " -^ GROUND WATER BASIN BOUNDARY • EXISTING WELL, PUMP. AND MOTOR EXISTING WELL- NEW PUMP AND MOTOR NEW WELL, PUMP, AND MOTOR PIPE LINE -PRIMARY SOURCE PIPE LINE-STANDBY SOURCE CANAL O == SIPHON STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION POTENTIAL WATER SUPPLY FACILITIES FOR PLANNED OPERATION OF SAN PASQUAL-MAIN LAKE HODGES BASIN GROUND WATER STORAGE DEPLETION OF 41,000 ACRE- FEET SAFE SEASONAL YIELD OF 6,000 ACRE-FEET SCALE OF MILES 1/2 I PLATE 16 LOCATION MAP LEGEND ^^^m SAN DIEGUITO RIVER WATERSHED BOUNDARY u^ " " ' -^ GROUND WATER BASIN BOUNDARY • EXISTING WELL, PUMP. AND MOTOR O EXISTING WELL- NEW PUMP AND MOTOR • NEW WELL, PUMP. AND MOTOR PIPE LINE -PRIMARY SOURCE PIPE LINE-STANDBY SOURCE =^= CANAL = -= ==- SIPHON STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION POTENTIAL WATER SUPPLY FACILITIES FOR PLANNED OPERATION OF SAN PASQUAL-MAIN LAKE HODGES BASIN GROUND WATER STORAGE DEPLETION OF 41,000 ACRE- FEET SAFE SEASONAL YIELD OF 6,000 ACRE- FEET SCALE OF MILES 1/2 I PLATE 16 "»«• ', jX X X'- #■ ^^ W 1 X^ ^V / X x4^ / v '~-~, v 1 1 "-X / -X , y S ---,. l^' eEOINNINC / / / / 1 KVk*. "^ ^ ** "^ ^ ih^'""'''^' ^-i":?! /- ^ / S^^r- // 3' TiaPPBOlllMflTE WftlEfi ' ,' Ji "^^ '' J^ "'°5/ ,3 >WsuFIHCE.Fttl,l. 1957 , ' U 11 1~-~~^ If rw^ X /^ '■ i / flk ■' / ~J ^Wf M/J '■X' ' jW / ))/''/ '^is^^ ' \ %'*' ''Jfc " -~1£X=X^ X,'/^ oG'^ifv /' 1 1 1 1 SAN LOCATION MAP LEGEND ^w«M sAFt DIEGUIIO •IIVEI) W«TEnSHE[> eOUNOAOT • EllSriltO WEt.L. OUWP. AND MOTOR O EIISTINC WELL-NEW CUMP and MOTOR • NEW WELL, PUMP, tm HOTOA PIPE IIME-P"IM»H> SOURCE -. p,»E LlNE-STiNDBT SOURCE »T*TI Of CALrrOBNI* DEPARTMENT OF WATER RESOURCES SAN DIEGUITO RIVER INVESTIGATION TENTIAL WATER SUPPLY FACILITIES FOR PLANNED OPERATION OF PASQUAL-MAIN LAKE HODGES BASIN NO WATEB STORAGE DEPLETION OF 41,000 ACRE- FEET SAFE SEASONAL YIELD OF 6.000 ACRE- FEET 1 1 1 1 1 / 7/ .'X frf Wl%% / ^^^«f ' / '' / ^^--'-^ H ' ! / '' / '' ~~~~- ' " 1 / '' ----/ ' // *? , PLATE 17 ^ \ \ \ } ^ f LEGEND ' SAN 0IE6U1T0 RIVER WATERSHED BOUNDARY MAJOR EXISTING WATER SUPPLY FACILITIES POTENTIAL FACILITIES FOR DEVELOPEMENT OF WATER RESOURCES + STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES Pt-ANNtNG SAN DIEGUITO RIVER INVESTIGATION EXISTING AND POTENTIAL ALTERNATIVE SURFACE WATER SUPPLY DEVELOPMENTS WITHIN SAN DIEGUITO RIVER WATERSHED SCALE OF MILES 1 PLATE 17 X \. 1 } ^ f LEGEND ' SAN OlEGUITO RIVER WATERSHED BOUNDARY MAJOR EXISTING WATER SUPPLY FACILITIES POTENTIAL FACILITIES FOR DEVELOPEMENT OF WATER RESOURCES + STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION EXISTING AND POTENTIAL ALTERNATIVE SURFACE WATER SUPPLY DEVELOPMENTS WITHIN SAN DIEGUITO RIVER WATERSHED SCALE OF MILES 11/2 I 2 III y-- 1 SAM DIEGUirO HIVER INVESTIGATION EXISTING AND POTENTIAL ALTERNATIVE SURFACE WATER SUPPLY DEVELOPMENTS WITHIN SAN DIEGUITO RIVER WATERSHED r^ PLATE 18 CREST ELEV. 1100 RIPRAP TO ELEV 890 ^^ SECTION OF DAM STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PAMO DAM AT SITE "B" ON SANTA YSABEL CREEK RESERVOIR STORAGE CAPACITY OF 163,400 ACRE FEET PLATE 18 CREST ELEV. MOO RIPRAP TO ELEV 890 ^^ SECTION OF DAM STATE OF CALIFOf?NIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION PAMO DAM AT SITE "B" ON SANTA YSABEL CREEK RESERVOIR STORAGE CAPACITY OF 163,400 ACRE FEET CREST ELEV MOo' SECTION OF DAM P TO ELEV 890' PLAN CREST ELEV. IIOQ 1000 I20O LENGTH tN FEET PROFILE OF DAM LOOKING OOWMSTREAM 2000 2Z00 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PL>NNING SAN DIEGUITO RIVER INVESTIGATION PAMO DAM AT SITE "B" ON SANTA YSABEL CREEK RESERVOIR STORAGE CAPACITY OF 163,400 ACRE FEET PLATE 19 SECTION OF MAIN DAM SECTION OF AUXILIARY DAMS SCALE O"^ f^EET STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION SAN PASQUAL DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 335,000 ACRE-FEET PLATE 19 Hsdh- w. s. ELEV 470' ^ ^ ^ "/ SECTION OF MAIN DAM SECTION OF AUXILIARY DAMS STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION SAN PASQUAL DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 335,000 ACRE-FEET NOTE TEST HOLE LOCATION OF CJCPLOnATOHT TEST MOLES DRILLED NOZ-'Z-'-O BT THE STATE DEPARTMENT OF WATER f CHEST ELEV. 490" SECTION OF MAI N DAM CREST ELEV- 490' IRERViauS BLANKET- SECTION OF AUXILIARY DAMS ^0 eOO 1000 1200 1400 i60D isoo zooo "l »0 400 MO ^ FIFV 490" lULWAT C i z^ s •^ i"' i'^"| — - r-t= 1 1 __— -r^ p^_ fH T^ P_— ^^rrq f^ t^^^ ■^^ ■ i; ^Ns^ < s:. ~ ~ =^ ~ ~ ~ ~ ~ UJ -1 1 ~^- LI --- -- ._. -- -- 1400 Z&.'0 aaOO SOOO JZOO S400 SeOO moo aOOO 4200 4400 4600 4BOO SOOO SZOO S400 DEPARTMENT OF WATER RESOURCES CH VISION or RESOUBC«S njNNiNO SAN DIEGUITO RIVER INVESTIGATION SAN PASQUAL DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 335.000 ACRE-FEET /-\ PLATE 20 CREST £L£V. 420' 'LOHATORV TEST HOLES DRILLED STATES ARMY CORPS OF ENGINEERS 4'X5' Sluict Ou'ltt SECTION B-B' CREST ELEV. tZO SECTION A-A STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES Division of resources planning SAN DIE6UIT0 RIVER INVESTIGATION SUPER HODGES DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 365,000 ACRE-FEET 3 PLATE 20 W.S ELEV. 403' CREST EtEV. 420' 'LOHATORY TEST HOLES DRILLED ISTATES ARMY CORPS OF ENGINEERS f { ^' SECTION B-B' 4'X5' Slu'Ct OutW ^ m CREST ELEV. 42Q W.S, ELEV. 403 48" OUTLET PIPE SECTION A-A' STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES Division OF RGSOURCes planning SAN DIEGUITO RIVER INVESTIGATION SUPER HODGES DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 365,000 ACRE-FEET SCALE OF FEET 50 50 100 V — r- r - — ... HI „..- Ill . ... JKIT EL ■f— ^TJ — B ^ s \ fv i !\x A^' ^ fN A v\ V >v /-^~>-^ v_^ ""n V- ^"-'^"^^' r^ ! \ — ^1 ^ SECTION A-A" PROFILE OF DAM □EPABTMENT OF WATER fiESOURCES SAN DIEGUITO R IVER INVESTIGATION SUPER HODGES DAM ON SAN DIEGUITO RIVER RESERVOIR STORAGE CAPACITY OF 365.000 ACRE-FEET PLATE 21 \ 1 FIGURE 5 ..^^ EFFECT OF SURCHARGE STORAGE ABOVE SPILLWAY CREST AVAILABLE STORAGE CAPACITY OCCURRING 50 PER CENT OF THE TIME ON APRIL FIRST p -- ^^ EET 10 20 30 40 SO 60 70 80 90 100 110 120 AVAILABLE STORAGE CAPACITY IN THOUSANDS OF ACRE-FEET SUPER HODGES RESERVOIR WITH A CAPACITY OF 365,000 ACRE-FEET STORAGE FOR FLOODS OF VARIOUS RECURRENCE INTERVALS (EDUCTION OF PEAK DISCHARGES BY EXISTING SUTHERLAND RESERVOIR WERE CONSIDERED NEGLIGIBLE 'EAK DISCHARGES WERE REDUCED BY EXISTING ■I0DGE5 RESERVOIR CONSIDERING SURCHARGE STORAGE ABOVE SPILLWAY CREST ONLY. THE TERM "AVAILABLE STORAGE CAPACITY" REFERS TO THAT PORTION OF THE GROSS STORAGE CAPACITY THAT IS AVAILABLE FOR FLOOD CONTROL PURPOSES. STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION HYDROLOGY OF CONTROL OF FLOODS BY RESERVOIRS OPERATED FOR WATER CONSERVATION PURPOSES IN SAN DIEGUITO RIVER WATERSHED PLATE 21 •" 130 1 1 FIGURE 5 .._^ EFFECT OF SURCHARGE STORAGE ABOVE SPILLWAY CREST AVAILABLE STORAGE CAPACITY OCCURRING 50 PER CENT 0_F^ THE TIME ON APRIL FIRST 10 100 RE-FEET EET STORAGE FOR FLOODS OF VARIOUS RECURRENCE INTERVALS 10 20 30 AC 50 60 70 SO 90 100 110 120 AVAILABLE STORAGE CAPACITY IN THOUSANDS OF ACRE-FEET SUPER HODGES RESERVOIR WITH A CAPACITY OF 365,000 ACRE-FEET DEDUCTION OF PEAK DISCHARGES BY EXISTING SUTHERLAND RESERVOIR WERE CONSIDERED NEGLIGIBLE 'EAK DISCHARGES WERE REDUCED BY EXISTING ■lODGES RESERVOIR CONSIDERING SURCHARGE STORAGE ABOVE SPILLWAY CREST ONLY. THE TERM "AVAILABLE STORAGE CAPACITY" REFERS TO THAT PORTION OF THE GROSS STORAGE CAPACITY THAT IS AVAILABLE FOR FLOOD CONTROL PURPOSES. STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION HYDROLOGY OF CONTROL OF FLOODS BY RESERVOIRS OPERATED FOR WATER CONSERVATION PURPOSES IN SAN DIEGUITO RIVER WATERSHED — nT Mill 1 ' ' FIGURE 1 /// f IN j /A SANTA 3*b'el 'encCK .1 P»0 M SI M -~ If 1 { ' .0.T VEO » "" """ ... " ^^ . «-,. <..,T VR. supen MODS S OM ""> ' M / / / DIVIVON » is'Vr r>i Set, y f 100 ^ 1 1 »0 ^.r^ FlGUhc c ro ^Ss ■v. ^ N 1 *° S s \ \ ^ s s < 1 je«MciTv or j69^o «H£-«eT 1 1 1 \ \ < \ AN PA MPAi ""( Rvoin ,000 ACRE- '(rr*'"''^ \ L " s i \ I6S.40O » WITH C.PIC \ \ \ \ \ < ' s s g ' S S fe » > \, \ ; \ ' ^ B ' \ \ £ \ HOTE 1 '"" )PEI»»Tt[> COORD 1 1 r THE ■it 1 \ I Z 345GTB9I0 ZOJ0 40M 100 200 V>0 PEAM DISCHARGE IN THOUSANDS OF SECOND-FEET PROBABLE FREQUENCY OF OCCURRENCE OF UNCONTROLLED FLOODS AT SELECTED DAM SITES »blE storage in probable frequency of occurrence OF AVAILABLE STORAGE FOR FLOOD CONTROL - ■ L{__ 1 FIGURE 6 1 1 / PEAK DISCHARGE OF SANTA YSABEL CHEEK ENTERING I / — £ f s ^ jl 3 ABOVE SPIU.*»» CREil AXB it y _ AVAILASLE STOHAOE CACACITY _ THE TIME ON APBIL FIBST —/ — i „_ Cll_ i> ' / i ,^ ;>' J f if // / A* ■ / J L- ' /^*y ' ' 1 1 -^ ^ y y •::^- DIEGUITO RIVER ENTERING SAN DIEGUITO VALLEY ABOVE SPILL-AT CREST ONL' ABOVE SPILLWAY CREST IND 1 ^^ r- %'■' y .'' OCCUXKINO 10 PEB CENT ■^ .^' ,„ FIGURE 3 140 - ABOVE SPILLWAY CREST 1 ^ »V*IL»BLe STO"«0E CPPPCITY •5 f I ' $ ^ - — , ■^ 5 N y -100 -TEAB FLOOD 5 * \ \ s s -I -I0( -TEA FLOOO \ 10 ^ < \ ■^ 1 ^^ -< -,.. .... S PLOOD i ■" ^ -__ _,. .... .PL.. ^ ^^ -, .... .u..f -~- -^ .. -C ■. -< ^"i " 'T° -~- -^ --- AIU18LE STORAGE CAPACITY (N THOUSANDS OF aCHE-FEET PAMO RESERVOIR WITH A CAPACITY OF 163.400 ACRE-FEET ILABLE STORAGE CAPACITY (N THOUSANDS OF ACRE-FEET SAN PASQUAL RESERVOIR WITH A CAPACITY OF 335.000 ACRE-FEET AILASLE STORAGE SUPER WITH A CAPACI THOUSANDS OF HODGES RESERVOIR ■y Of 365.000 flCRE-l RELATIONSHIP BETWEEN SPILLWAY DISCHARGE AND AVAILABLE RESERVOIR STORAGE FOR FLOODS OF VARIOUS RECURRENCE INTERVALS FI6UR ; T 1 '1 1 fli — / ,, / ,' /' / / / ,■* -' ,■■' / '" ^ .-' / ,^-" . / - — > / -' r DIEGUITO RIVER ENTERING SAN DIEGUITO VALLEY ■ AVAILABLE STOHABE CAPACITI y — y •' 1 FIGURE e 1 / / ^11 / / / / 1 _J-. .-- / f-- / / / / - PEAK DISCHARGE OF SAN -- DIEGUITO RIVER ENTERING SAN DIEGUITO VALLEY — CONSIDERING SURCHARGE STOOAQE ABOVE SPILLWA' CREST ONLT . ^ / / / — / OCCURRING SO PER CENT OF ^ y NOTE- REDUCTION OF PEAK DISCHARGES I SUIHERLAND RESERVOIR WERE NECLIGIBLE REFERS TO 1 PEAK DISCHARGE IN THOUSANDS OF SECOND-FEET PAMO RESERVOIR WITH A CAPACITY OF 163.400 ACRE-FEET PROBABLE FREQUENCY WITH A CAPACITY OF 335.000 ACRE-FEET OCCURRENCE OF FLOOD PEAKS REDUCED PEAK OISCHARGE IN THOUSANDS OF SECOND-FEET SUPER HOOGES RESERVOIR WITH A CAPA'CITY OF 365,000 ACRE-FEET BY RESERVOIRS DEPARTMENT OP WATER RESOURCES SAN DIEGUITO RIVER INVESTIGATION HYDROLOGY OF CONTROL OF FLOODS BY RESERVOIRS OPERATED FOR WATER CONSERVATION PURPOSES SAN DIEGUITO RIVER WATERSHED PLATE 22 DAMAGES, CONSIDERING SURCHARGE STORAGE ABOVE SPILLWAY CREST ONLY DAMAGES, CONSIDERING SURCHARGE STORAGE ABOVE SPILLWAY CREST AND AVAILABLE STORAGE CAPACITY OCCURRING 50 PER CENT OF THE TIME ON APRIL FIRST 10 13 FREQUENCY OF OCCURRENCE IN 100 YEARS SUPER HODGES RESERVOIR WITH A CAPACITY OF 365,000 ACRE-FEET SAN DIEG U I TO VALLEY OF PEAK DISCHARGES BY EXISTING 10 RESERVOIR WERE CONSIDERED harges were reduced by existing :servoir considering surcharge .bove spillway crest only, "available storage capacity" that portion of the gross ;apacity that is available for itrol purposes state of CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION ECONOMICS OF CONTROL OF FLOODS BY RESERVOIRS OPERATED FOR WATER CONSERVATION PURPOSES SAN DIEGUITO RIVER WATERSHED PLATE 22 FREQUENCY OF OCCURRENCE IN 100 YEARS SUPER HODGES RESERVOIR WITH A CAPACITY OF 365,000 ACRE-FEET SAN D lEG U I T V A L L E Y OF PEAK DISCHARGES BY EXISTING \iD RESERVOIR WERE CONSIDERED HARGES WERE REDUCED BY EXISTING ;SERVOIR CONSIDERING SURCHARGE iBOVE SPILLWAY CREST ONLY. "AVAILABLE STORAGE CAPACITY" THAT PORTION OF THE GROSS CAPACITY THAT IS AVAILABLE FOR ITROL PURPOSES STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES DIVISION OF RESOURCES PLANNING SAN DIEGUITO RIVER INVESTIGATION ECONOMICS OF CONTROL OF FLOODS BY RESERVOIRS OPERATED FOR WATER CONSERVATION PURPOSES IN SAN DIEGUITO RIVER WATERSHED FIGURE 1 1 1 / t MN O'EflyiTO V* LL.,, / \ / y / / / / / / / / SMXSQU EW FLOWS — / / 'rsiett CB i / / ... ^ -^ 1 PEAK OlSCHSfteE IN THOUSANDS OF ACRE- FEET RELATIONSHiP BETWEEN PEAK DISCHARGE AND DAMAGE UNDER ESTIMATED AVERAGE CONDITIONS OF DEVELOPMENT DURING THE 50-YEAR PERIOD I95B THROUGH 2007 FIGURE 2 - DAUkSES UNOCR EXISTING COMDITIONB \ OKUAOES " ABOVE S COXSIOEOING SURCHIRGC $ ■LLWIT CHEST ONLT TOR. ' \j ^ ^ \ \ ^ )^ s \ \ ....«> c. °h 16 S BtHIBOE STOHI E ^ \ 0* z,; F.VsT a- Of THE T,« ^ ^« < ^ r^ -.^ ^=^ — — FIGURE 3 ^ - OAUAOES UNDER EKIST.no CONOIT ONS - ".xrsV™.""™" o'«T"' ROE ""'« v^ -^ 1 \ N s \, \ ABOVE % tOHSioeniNS burcmb lOE SIOF M \ ^ ^ 1— ON •"HIL FinSI «NI Of T E ^ \ ■n \ ^ ^ ► — t-.. ' , FIGURE 4 _.. ..■■ ...E R EllSriNO ONOI o«s DAUAOES. CONSIDERINS 5URCHA ~ AflOWE SPILLOAt CREST OttLI "' TOR.. \, s s \ ABOVE s >'llL*A. CREST tM IBCHA "S,r STOR ACE ^ N EAPiClf OCCJRHINU 50 PEB CENT OF THE T.UE ~| '^ \ \ 1 1 1 1 V ^ i 1 ■~- L-^ -^ 1 — — FHEOUENCY OF OCCURRENCE IN 100 TEARS PAMO RESERVOIR WITH A CAPACITY OF 163,400 ACRE- FEET RESERVOI R S FHEOUENCT OF OCCURRENCE IN lOO 1EABS SAN PASOUAL RESERVOIR WITH A CAPACITY OF 335.000 ACRE- FEET FREQUENCY OF DAMAGE FROM FREQUENCY OF OCCURRENCE IN 100 TEARS SUPER HODGES RESERVOIR WITH A CAPACITY OF 365,000 ACRE-FEET OIEG U I T V A L L E Y FIGU BE 5 TOO SCO \ ^ a" DER ss, g'» ELC EE. V \ \ \ ^ - ABOVE pn-umi «"CR EST »"""" ' ' ,/ X y. \ y \ \\ \ AB vespIllwa. crcst ano avai GE STORAOE 1 ABLE STORAGE \ \ ^ y c 0*N ACIIV OCCUROINO *0 PER CENT OF THE TIME ^ '"t""\ 1 A \ \ \ \ > _,. \ N LEGEND BEIE'ITS. CONSIDER >NC STORAGE ABOVE SPICCI m^ ' SAN t*SQUAL V4I.LE1 ^Si' SAN PASOUAL V :o it FREQUENCY OF OCCU««ENCE PAMO RESERVOIR WITH A CAPACITY OF 163,000 ACRE-FEET EFFECT OF RESERVOIR ON FREQUENCY OF DAMAGE FROM FLOODS IN SAN PASQUAL VALLEY AVERAGE ANNUAL BENEFITS CREDITABLE TO POTENTIAL WATER CONSERVATION RESERVOIRS 3TE REOUCTIOH OF BEAK DISCHAflSES BT EKSTINO SUTHCRLANO RESERVOIR WERE COMSlDERCS NEOLIOIBLE PEAK DISCHAR9ES WERE REOUCED S> EllSTINC HOOOES RESERVOIR CONSIDERINS SURCmaoSE STORAOE ABOVE SPILLWAY CREST ONLY DEPARTMENT OF WATER RESOURCES Division OF BCSOUWCCS PL^NHIWl SAN DIEGUITO RIVER INVESTIGATION ECONOMICS OF CONTROL OF FLOODS BY RESERVOIRS OPERATED Fon WATER CONSERVATION PURPOSES SAN DIEGUITO RIVER WATERSHED TOTAL PROJECT COST NOT INCLUDING CONVEYANCE FACILITIES P S P E S. V. P 90 '^ '•-, V 40.6 ADDITIONAL COST TO THE CITY OF SAN DIEGO NOT INCLUDING CONVEYANCE FACILITIES ADDITIONAL COST TO THE CITY OF SAN DIEGO FOR PLANS OF DEVELOPMENT WITHIN SAN DIEGUITO RIVER WATERSHED INCLUDING CONVEYANCE FACILITIES ADDITIONAL COST TO THE CITY OF SAN DIEGO FOR PLANS OF DEVELOPMENT WITHIN SAN OIEGUITO RIVER WATERSHEC INCLUDING CONVEYANCE FACILITIES AND ENLARGEMENT OF SAN VICENTE RESERVOIR PAMO "B" dam AND RESERVOIR SAN PASQUAL DAM AND RESERVOIR ENLARGEMENT SAN VICENTE PaM .iNn RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES IN THOUSANDS OF ACRE " 30 PLATE 23 P S P t S V P 90 -V 40 6 ADDITIONAL COST TO THE CITY OF SAN DIEGO FOR PLANS OF DEVELOPMENT WITHIN SAN DIEGUITO RIVER WATERSHED INCLUDING CONVEYANCE FACILITIES ADDITIONAL COST TO THE CITY OF SAN DIEGO FOR PLANS OF DEVELOPMENT WITHIN SAN DIEGUITO RIVER WATERSHED INCLUDING CONVEYANCE FACILITIES AND ENLARGEMENT OF SAN VICENTE RESERVOIR PAMO "B" DAM AND RESERVOIR SAN PASOUAL DAM AND RESERVOIR ENL ARGEME'^"^ ^'^^ virFNTF naM awn RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE I OPACITIES IN THOUSANDS OF ACRf " I 1 I \ \ 30 31 32 33 34 'IT4L COST .IONS OF DOL RELATIONSHIP BETWEEN STORAGE CAPACITY OF RESERVOIRS AND CAPITAL COSTS r^ N PASQUAL, INCLUDING 37,000 RE-FEET OF GROUND WATER ORAGE DEPLETION WITHIN THE SERVOIR AREA, AND SPILLWAY TES ON SUTHERLAND. >IG 37,000 D WATER WITHIN THE LWAY GATES ENLARGEMENT I 1 1 1 i SUPER HODGES, INCLUDING 41,000 ACRE-FEET OF GROUND WATER STORAGE DEPLETION WITHIN THE RESERVOIR AREA, AND SPILLWAY GATES ON SUTHERLAND. P. S.R E.S.V. P90 E.S.V 40.6 LEGEND PAMO "B" DAM AND RESERVOIR SAN PASOUAL DAM AND RESERVOIR ENLARGEMENT OF SAN VICENTE 0AM AND RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES IN THOUSANDS OF ACRE-FEET 20 25 26 PLATE 24 J75 250 200 125 75 28 [ASONAL SYSTEM YIELD N PASQUAL, INCLUDING 37,000 RE-FEET OF GROUND WATER ORAGE DEPLETION WITHIN THE SERVOIR AREA, AND SPILLWAY TES ON SUTHERLAND. 'JG 37,000 WATER WITHIN THE LWAY GATES NLARGEMENT T 1 1 1 i SUPER HODGES, INCLUDING 41,000 ACRE-FEET OF GROUND WATER *■ STORAGE DEPLETION WITHIN THE RESERVOIR AREA, AND SPILLWAY GATES ON SUTHERLAND. P. S.R E.S.V. P90 E.S.V 40.6 LEGEND PAMO "B" DAM AND RESERVOIR SAN PASQUAL 0AM AND RESERVOIR ENLARGEMENT OF SAN VICENTE DAM AND RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES IN THOUSANDS OF ACRE-FEET 20 26 PLATE 24 375 350 250 125 100 75 --J 28 ASONAL SYSTEM YIELD SAN PASQUAL. INCLUDING 37,000 ACRE-FEET OF GROUND WATER STORAGE DEPLETION WITHIN THE RESERVOIR AREA. SPILLWAY GATES ON SUTHERLAND. AND ENLARGEMENT OF SAN VICENTE 1 1 1 1 SUPER HODGES. INCLUDING 41.000 ACRE-FEET OF GROUND WATER STORAGE DEPLETION WITHIN THE RESERVOIR AREA. AND SPILLWAY GATES ON SUTHERLAND. SAN PASQUAL. INCLUDING 37,000 ACRE-FEET OF GROUND WATER STORAGE DEPLETION WITHIN THE RESERVOIR AREA. AND SPILLWAY GATES ON SUTHERLAND. PAMO 'B; SAN PASQUAL- MAIN LAKE HODGES BASIN WITH 41,000 ACRE- FEET OF GROUND WATER STORAGE DEPLETION. SPILLWAY GATES ON SUTHERLAND. AND ENLARGEMENT OF SAN VICENTE PAMO B, SAN PASQUAL- MAIN LAKE HODGES BASIN WITH 41.000 ACRE- FEET OF GROUND WATER STORAGE DEPLETION, AND SPILLWAY GATES OF SUTHERLAND SAN PASQUAL- MAIN LAKE HODGES . BASIN WITH 41,000 ACRE-FEET OF STORAGE DEPLETION, SPILLWAY GATES SUTHERLAND, AND ENLARGEMENT OF . SAN VICENTE PAMO "e" OaM 4ND RESERVOIR SAN PASQUAL DAM ANO RESERVOIR ENLARGEMENT OF SAN VICENTE 0AM AND RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES IN THOUSANDS OF ACRE-FEET I SAN PASQUAL-MAIN LAKE HODGES GROUND WATER BASIN ADDITIONAL SAFE SEASONAL YIELD AVAILABLE To CITY OF San OIEGO IN THOUSANDS OF ACHE - FEET RELATIONSHIP BETWEEN STORAGE CAPACITY OF RESERVOIRS AND ADDITIONAL SAFE SEASONAL SYSTEM YIELD DEPARTMENT OF WATER RESOURCES PLATE 25 LEGEND SAN DIEGUITO RIVER WATEHSHED PROJECTS TOTAL PROJECT COST, INCLUDING CONVEyiNCE FACILITIES ~ ADDITIONAL COST TO THE CITY OF SAN DIEGO, INCLUDING CONVEYANCE FACILITIES ENLARGEMENT OF SAN VICENTE RESERVOIR AND SAN DIEGUITO RIVER WATERSHED PROJECTS TOTAL PROJECT COST, INCLUDING CONVEYANCE FACILITIES ADDITIONAL COST TO THE CITY OF SAN DIEGO, INCLUDING_ CONVEYANCE FACILTIES S, P. SH. G W E S V P. 90 PAMO "B" DAM AND RESERVOIR SAN PASQUAL DAM AND RESERVOIR SUPER HODGES DAM AND RESERVOIR SAN PASQUAL -MAIN LAKE HODGES BASIN ENLARGEMENT OF SAN VICENTE DAM AND RESERVOIR SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES IN THOUSANDS OF ACRE -FEET SYMBOL INDICATING CAPITAL COST IN MILLIONS OF DOLLARS * AVERAGE UNIT COST TO CITY OF SAN DIEGO OF 508,700 ACRE- FEET OF WATER PURCHASED FROM SAN DIEGO COUNTY WATER AUTHORITY WAS ABOUT J48 PER ACRE-FOOT, INCLUDING TAXES, DURING THE TEN -YEAR PERIOD FROM IStT-'ie THROUGH 1956-57 PLATE 25 1 n — \ — 1 — \ — 1 — \ — 1 I'a LEGEND IB SAN DIEGUITO RIVER WATERSHED PROJECTS TOTSL PROJECT COST, INCLUDING CONVEYANCE FA 17 CILITIES CONVEYANCE FACILITIES ENLARGEMENT OF SAN VICENTE RESERVOIR AND SAN DIEGUITO RIVER WATERSHED PROJECTS 15 ADDITIONAL COST TO THE CITY OF SAN DIEGO. CONVEYANCE FACILTIES NCLUDING 14 P PAMO "B" DAM AND RESERVOIR P. SAN PASOUAL DAM AND RESERVOIR 13 S. S H. SUPER HODGES DAM AND RESERVOIR G W SAN PASQUAL-MAIN LAKE HODGES BASIN ENLARGEMENT OF SAN VICENTE DAM AND RESE ,2 E RVOIR P. 90 SYMBOL INDICATING RESERVOIR STORAGE CAPACITIES 1 1 E S V 406 IN THOUSANDS OF ACRE -FEET SYMBOL INDICATING CAPITAL COST IN MILLIONS ^ OF DOLLARS 10 ^ AVERAGE UNIT COST TO CITY OF SAN DIEGO OF 508,700 ACRE- FEET OF WATER PURCHASED FROM ^- SAN DIEGO COUNTY WATER AUTHORITY WAS ABC 8 48 PER ACRE-FOOT, INCLUDING TAXES. OURINC UT 9 , THE ^ ^ TEN-YE AR PERIOD FROM 194 7-48 THR OUGH 1956 -57 8 7 ^ • ^ ^ 6 ^^ -^ 3 S H. 157. © 3 4 3 2 165 170 175 180 185 190 195 200 205 210 215 220 \ l.lBRAhY DAVIS iOPY 2 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES BULLETIN NO. 72 SAN DIEGUITO RIVER INVESTIGATION VOLUME II APPENDIXES EDMUND G. BROWN Governor April, 1959 HARVEY O. BANKS Director of Water Resources DAVIS JAN Z6 19:0 L!BRARY___ .IBRAHY DAVIS ;OPY 2 STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES BULLETIN NO. 72 SAN DIEGUITO RIVER INVESTIGATION VOLUME II APPENDIXES EDMUND G. BROWN Governor April, 1959 HARVEY O. BANKS Director of Water Resources »1V l_r01 I DAVIS JAN Z6 19:0 library___ STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES BULLETIN NO. 72 SAN DIEGUITO RIVER INVESTIGATION VOLUME II APPENDIXES [ EDMUND G. BROWN Governor HARVEY O. BANKS Director of Water Resources TABLE OF CONTENTS Appendix Page A« Agreement Between the State Water Resources Board, the City of San Diego, and the Department of Public Works, and the Amendment Thereto, Authorizing the Investigation ,.=.... A-1 B, Geology and Ground Water of San Dieguito River Watershed »,,„... .0...0. <,........ B-1 C, Records of Monthly Precipitation at Selected Sites in San Dieguito River Watershed for the Period 1936-37 Through 1956-57 ......... C-1 D, Estimates of Monthly Runoff from Selected Areas in San Dieguito River Watershed for the Period 191ii-l5 Through 1956-57 <,...,... D-1 E» Estimates of Seasonal Imports and Exports Affecting San Dieguito River Watershed , ...... . E-1 F, Mineral Analyses of Water ,,...o...<. F-1 G. Applications to Appropriate Water and Recent Litigation Affecting Water Rights in San Dieguito River Watershed ,...,„,....«., G-1 H, Land Use, Land Classification, and Consumptive Use of Water in San Dieguito River Watershed H-1 I, Estimates of Monthly Evaporation at Selected Sites in San Dieguito River Watershed for the Period 1936-37 Through 1956-57 ........... I-l J. Restilts of Subsurface Exploration and Soil Tests at Dam and Reservoir Sites in San Dieguito River Watershed ................ J-1 K. Estimates of Costs . . K-1 L. Results of Related Reservoir Operation Studies L-1 APPENDIX A AGREEMENT BETWEEN TflE STATE WATER RESOURCES BC/ffiD, THE CITY OF SAN DIEGO, AND THE DEPARTf4ENT OF PUBLIC WORKS AND THE AMENDI-IENT THERETO, AUTHORIZING THE INVESTIGATION (A-1) A-3 ACffiEEMENT BETWEEN THE STATE WATER RESOURCES BOARD, THE CITY OF SAN DIEGO, AND THE DEPARTMENT OF PUBLIC WORKS THIS AC2iEEMENT, executed in quintuplicate, entered into as of the 1st day of July, 1956, by and between the State Water Resources Board, here- inafter referred to as the "Board", the City of San Diego, hereinafter referred to as the "City", and the Department of Public Works, State of California, acting through the agency of the State Engineer, hereinafter referred to as the "State Engineer" s WITNESSETH WHEREAS, The Budget Act of 1956 (Chapter 1, Statutes of 1956) by Item 224 appropriated the sum of |12,500 for the initiation of an investi- gation of water supply developments on the San Dieguito Riverj and WHEREAS, by the State Water Resources Act of 1945, as amended, the Board is authorized to make investigations, studies, surveys, hold hesjrings, prepare plans and estimates, and make recommendations to the Legislature in regard to water development projects, including flood control plans and projects | and WHEREAS, by said act., the State Engineer is authorized to cooper- ate with any county, city, state agency, or public district on flood control and other water problems and when requested by any thereof may enter into a cooperative agreement to expend money on behalf of any thereof to accomplish the purposes of said act| cind WHEREAS, the City has requested the Board to enter into a cooper- ative agreement to conduct a comprehensive investigation of water supply developments on the San Dieguito Riverj and A~k WHEREAS^ the Board has requested the State Engineer to cooperate in conducting a comprehensiTe jjivestigation of water supply developments on the San Dieguito River and to formulate a report thereoni NOWp THEREFOEEj in consideration of the premises and of the several promises to be performed by each as hereinafter set forth, the Board, the Citys and the State Engineer do hereby Eaj.tually agree as follows s ARTICLE I - WOM TO BE PERFORMED s The work to be performed under this agreement shall consist of (l) re-evaluation of plans of development of the San Dieguito River as presented in Bulletin No, 55? "San Dieguito and San Diego Rivers Investi- gation", Division of Water Resources, 1949> (2) investigation of the proposed development on the basis of the reservoirs being operated independently of each other, and also on the basis of coordinated oper- ation with other developments currently supplying water to the City of San Diego, and such other developments as may be contemplated for the future, (3) investigation of combined operation of various surface storage developments and utiU.aation of the ground water storage capacity in San Pasqual ¥alley with consideration of water rights which would be affected thereby, (4) preliminary design and estimates of costs of proposed works, (5) determination of the cost of acquisition of lands and rights of way required for proposed works, and (6) economic comparisons of alternative plans for water development. The Board by this agreement authorizes and directs the State Engineer to cooperate by conducting said investigation and formulating said report and by otherwise advising and assisting in formulating solutions to the water problems in San Diego Coimty. A-5 During the progress of said investigationp all maps, plans, infor- mation, data, and records pertaining thereto which are in the possession of any party hereto, shall be made fully available to any other party hereto for the due and proper accomplishments of the objectives hereof. The work to be done under this agreement shall be diligently prose- cuted ydth the objective of completing the investigation sind report by June 30> 1958, or as nearly thereafter as possible o ARTICLE II - FUNDS s On execution of this agreement, the City shall transmit the sum of Twelve Thousand Five Hundred Dollars (|12,500) to the State Engineer for deposit, subject to the approval of the Director of Finance, into the Water Resources Revolving Fund in the State Treasury, for expenditure by the State Engineer in performance of the work provided for in this agreement. Also upon execution of this agreements, the Board shall request the Director of Finance to approve the transfer of the sum of Twelve Thousand Five Hundred Dollars ($12,500) from funds appropriated by the Board by Item 224 of the Budget Act of 1956 to the said Water Resources Revolving Fund for expenditure by the State Engineer in performance of work provided for in this agreement during the fiscal year 1956-57 » It is understood by and between the parties hereto that the sum of Twenty-five Thousand Dollars (|25,000) to be made available as hereinbefore provided, is adequate to perform the above specified work during the fiscal year 1956-57, and it is the understanding that the City will make a further sum of Twelve Thousand Five Hundred Dollars ($12,500) available at the com- mencement of the fiscal year 1957-58 which will be subject to a matching A-6 contribution in an equal sum by the Board for the completion of said investi- gation and report, contingent upon the availability of City and Board funds for such purposes. Notwithstanding anything contained in this agreement contrary hereto or in conflict herewith, this agreement is made contingent upon the funds being deposited in or transferred to the Vfater Resources Revolving Fund as provided herein for expenditure by the State Engineer in performance of the work provided for in this agreement. In the event any of the funds are not transferred to the Water Resources Fund by the Director of Finance as provided for herein within 30 days after the Board requests such trans- fer, this agreement shall terminate and the unexpended balance of any funds deposited by the City shall be returned, provided that neither the Board nor the State Engineer shall be obligated to the City for any portion of the funds already expended. The Board and the State Engineer shall under no circumstances be obligated to expend for or on account of the work provided for under this agreement any amount in excess of the funds made available hereunder. Upon completion and final payment for the work provided for in this agreement, the State Engineer shall furnish to the Board and to the City a statement of all expenditures made under this agreement. One-half of the total amount of all said expenditures shall be deducted from the sum advanced from funds appropriated to the Board and one-half of the total amount of all said expenditures shall be deducted from the sum advanced by the City and any balance which may remain shall be returned to the Board auid to the City in equal amounts. Notwithstanding anything herein contained to the contrary, this agreement may be terminated and the provisions of this agreement may be altered, changed, or amended, by mutual consent of the parties hereto. IN WITNESS WHEREOF, the parties hereunto have executed this agreement as of the date first herein written. A-7 Approved as to Form and Procedure J. F. DuPAUL, City Attorney B y /s/ Harold W. Reese Asst, City Attorney City of San Diego Approved as to Form and Procedure CITI OF SAN DIECX) B y /s/ Oo W. Campbell City Manager FRED Wo SICK City Clerk By /s/ Helen M, Willig Deputy .(SEAL) /s/ Mark C. Nosier Attorney, Division of Water Resources Approved as to Form and Procedure STATE WATER RESOURCES BOARD B y /s/ Clair Ao Hill Clair A. Hill, Chainnan Attorney, Department of - Public Works APPROVED s Director of Finance STATE OF CALIFORNIA DEPARTMENT OF PUBLIC WORKS FRANK B„ DURKEE Director of Public Works B y /s/ A. H» Henderson A. H, HENDERSON Deputy Director (SEAL) DEPARTMENT OF FINANCE APPROVED AUG 8 1956 JOHN Mo PEIRCE, Director By /s/ Louis J. Heinzer Administrative Adviser Harvey 0. Banks State Engineer B y /s/ T. R. Merryweather Administrative Officer A -8 AMENDMENT TO AGREEMENT ENTITLED AGREEMENT BETWEEN THE STATE WATER RESOURCES BOARD, THE CITY OF SAN DIEGO, AND THE DEPARTMENT OF PUBLIC WORKS Tliis amendatory agreement, made and entered into as of the 30th day of Jtine, 1958^ l^y and between the State of California, acting by and throiigh its Director of Water Resources, hereinafter referred to as the "State", and the City of San Diego, hereinafter referred to as the "City". WITNESSETH WHEREAS, the State Water Resources Board, hereinafter referred to as the "Board", the City of San Diego, hereinafter referred to as the "City", and the Department of Public Works, State of California, acting through the agency of the State Engineer, hereinafter referred to as the "State Engineer", entered into a cooperative agreement as of the 1st day of July, 1956, whereby the State Engineer agreed to conduct a comprehensive investigation of water supply developments on the San Dieguito River SJid to formulate a report thereon, and the City euid the Board agreed to share equally in the cost thereof J and WHEREAS, the agreement provided that the work was to be diligently prosecuted with the objective of completing the investigation and report by June 30, 1958? or as nearly thereafter as possible^ and WHEREAS, it is estimated that additional funds in the amount of $18,000, and an extension of time to December 31^ 1958> will be needed to complete the investigation and report; ajid WHEREAS, by Item 257 of the Budget Act of 1958 (Chapter 1, Statutes of 1958) the State Legislature appropriated funds for continuation of the investigation during the 1958-59 fiscal year; and A -9 WHEREAS, it is the mutual desire of the parties hereto that the investigation sjid report be continued and completed on or before Decem- ber 31, 1958; and WHEREAS, p\irsuant to Article 1, Chapter 2, Division 1 of the California Water Code, the Department of Water Resources succeeded to and is vested with all of the powers, duties, purposes, responsibilities, and jurisdiction in matters within the scope of said original agreement of July 11, 1956, which were vested in the Department of Public Works, State of California, acting through the agency of the State Engineer, ajid the State Water Resotirces Boajrd; NOW THEREFORE, it is mutually agreed, subject to the availa- bility of funds, that the original agreement is hereby amended as follows: (1) The time for completion of the investigation ajid report to be made under the original agreement is extended to and including December 3I, I958. (2) The City shall contribute $S,000 for the continuation, during the period from July 1, 1958 to December 31^ 1958 inclusive, of the work provided for by this agreement, which sum shall be traxis- mitted to the State upon execution of this amendment. (3) The State shall contribute $9,000 from funds appropriated to the Department of Water Resources by Item 257 of the Budget Act of 1958 for the continuation, during the period from July 1, 1958 to December 31.» 1958 inclusive, of the work provided for by this agreement. {k) Except as herein amended the original agreement referred to above is continued in full force and affect. 10 IN WITNESS WHEEEOF, the parties hereto have executed this agreement . improved as to Form smd Procediire CITY OF SAN DIEGO J. F. DU PAUL, City Attorney By /s/ H. W. Reese Assiste^nt City Attorney City of San Diego Approved as to Form and Procedure /s/ T. W. Fletcher Assistant to the City Manager (SEAL) City Clerk P. A. TOWNER Chief Counsel, Department of Water Resources APPROVED: DEPARTMENT OF FINANCE Sept. 19, 1958 T. H. MUGFORD Director of P'inance By /s/ Emll J. Relat Senior Counsel STATE OF CALIFORNIA DEPARTMENT OF WATER RESOURCES /s/ Har/ey 0. Banks Harvey 0. Banks Director -3- I RESOLUTION NO. I49IO9 BE IT RESOLVED, by the Council of the City of San Diego, as follows: That the City Manager be, and he is hereby authorized and empowered to execute, for and on behalf of said City, an "Amendment to Agreement entitled 'Agreement between the State Water Resources Board, The City of San Diego, and the Department of Public Works ' " providing for payment of additional funds in order to complete the investigation emd report required under the original cooperative eigreement with the State Water Resources Board, under the terms and conditions set forth in the form of Amendment to Agreement on file in the office of the City Clerk as Document No. 376368 . BE IT FURTHER RESOLVED, that the City Auditor and Comptroller is hereby authorized and directed to transfer the svun of $9,000.00 within the Water Department Fund, from Unallocated Reserves, Account 500-230, to Non-Personal Expense, PlsJinlng and Investigation, Account 5OO-IOO5, to provide additional funds to cover the expense provided for under the above-mentioned agreement. Presented by Approved as to form by J. F. DuPAUL, City Attorney, By Chief Deputy M/7/25/58 Passed and adopted by the Council of The City of San Diego on July 3I, I95B, by the following vote: YEAS — Councilmen: Williams, Schneider^ Kerrigan, Curran, Evenson, Mayor Pail NAYS — Co\incilmen: None ABSENT- Councilman: Tharp AUTHENTICATED BY: CHARLES C. DAIL Mayor of The City of San Diego, California PHILLIP ACKER City Clerk of The City of San Diego, California ( SEAL ) By ELFA F. HAMEL ^Deputy I HEREBY CERTIFY that the above and foregoing is a full, true and correct copy of RESOLUTION NO. 1^^9109, passed and adopted by the Coimcil of The City of San Diego, California July 3I, I958. PHILLIP ACKER City Clerk of The City of San Diego, California ( SEAL ) B y /s/ ELFA F. HAMEL ^Deputy APPENDIX B GEOLOGY AND GROUND WATER OF SAN DIEGUITO RIVER WATERSHED (B-1) TABLE OF COIfTENTS GEOLOGY AND GROUND WATER OF SAN DIEGUITO RIVER WATERSHED Page CHAPTER B-I. irWRODUCTION B-6 CHAPTER B-II. PHYSIOGRAPHY B-9 CHAPTER B-III. GEOLOGIC HISTORY B-12 CHAPTER B-IV. GEOLOGIC UNITS B-l4 Permeable Materials ...........<....... B-I6 Recent Alluvium ....... ..o...".. B-l5 Beach and Dune Sands ........... ^ ...... o.... . B-I6 Residuum » B-17 Semipermeable Sediments ....... ... B-lo Poway Conglomerate B-lo La Jolla Formation .........<...... B-lo Fractured Rock .................... B-19 Leucogranodiorite ........... B-20 Granodiorite ................... B-20 Tonalite B-20 C-atbro B-21 Jurassic Slates ............ B-21 Stonewall Granodiorites and Associated Metamorphics B-21 Santiago Peak Volcanics . ...... B-21 Intrusives Related to the Santiago Peak Volcanics B-22 Bedford Canyon Formation and Julian Schists ... B-22 CHAPTER B-V. STRUCTURE B-23 (B-2) p ft « o e CHAPTER B-VI. DESCRIPTION OF GROUND WATER BASINS Coastal Hydrologic Unit San Dieguito Basin Geology . Occurrence of Ground Water Movement of Ground Water . Replenishment and Depletion of Ground Water . . Subsurface Outflow and Inflow ......... Ground Water Storage Capacity and Specific Yield Yield of Wells Other Area .... Central Hydrologic Unit • A e « San Pasqual Basin . . Geology .... Occurrence of Ground Water ........... Movement of Ground Water ..... . . Replenishment and Depletion of Ground Water . . Subsurface Inflow and Outflow ......... Ground Water Storage Capacity and Specific Yield Yield of Wells l&ke Hodges Basin , Geology «.,...... Occurrence of Ground Water Movement of Ground Water . Replenishment and Depletion of Ground Water Subsurface Inflow and Outflow ....... o • e a • o Page B-25 B-33 B-33 B-33 B-33 B-3'^- B-3^ B.35 B-5? B.35 B^5 B.37 B-37 B-37 B-38 B-38 B-38 B-39 B=39 B-39 B-39 B-39 B-iiO B-lO B-UO B-1+1 (B-3) Page Ground Water Storage Capacity and Specific Yield B-ljl Yield of Wells B-ljl Felicita Basin B-Ia Geology B-U2 Occurrence of Ground Water B-1+2 Movement of Ground Water B-142 Replenishment and Depletion of Ground Water B-I42 Subsurface Inflow and Outflow B-ii3 Ground Water Storage Capacity and Specific Yield B-ij3 Yield of Wells B-ii3 Other Areas B-IiS Inland Hydrologic Unit B-UU Ramona Basin ....« <^>.... B— uu Geology B-i^U Occurrence of Ground Water •• B-it5 Movement of Ground Water B-kS Replenishment and Depletion of Ground Water B-ii5 Subsurface Inflow and Outflow B-lj5 Ground Water Storage Capacity and Specific Yield B-I45 Yield of Wells B-hS Other Areas B-b6 CHAPTER B-VII. PROCEDURES FOR ESTIMATING GROUND WATER STORAGE AND SUBSURFACE FLOW B-I47 Ground Water Storage B-ij7 Subsurface Flow B-'+9 BIBLIOCffiAPHY B-52 (B-4) TABLES Table No. Page B-1 Stratigraphic Column for San Diegulto River Watershed B-I5 B-2 Description of Ground Water Basins B-26 B-3 Ground Water Basin Characteristics ..... B-31 B'k Specific Yield of Water-Bearing Materials ... B-49 B-5 Summeiry of Permeability Tests B-51 (B-5) a-b APPENDIX B GEOLOGY CHAPTER B-I. INTRODUCTION This geologic investigation was limited to the San Dieguito River watershed, which includes an area of approximately 3'+5 square miles within the coastal portion of San Diego County. This appendix presents the results of the geologic studies, with particular emphasis placed upon those geologic features which Influence the occurrence and movement of ground water » . The geologic studies were conducted as a part of the investiga- tion of conservation developments on the San Dieguito River and its tributaries undertaken in cooperation with the City of San Diego. Its purpose Is threefold, namely: 1. To describe the geology and water-bearing characteristics of the rocks. 2. To discuss the effects of geologic structure upon the movement of ground water and the infiltration of sea water, and to describe briefly the history of events Involved In the evolution of the principal structures. 3. To describe the procedures followed in estimating the changes In ground water storage and subsurface ground water movement that occurred within the principal basins during selected periods of study. In order to accomplish the foregoing objectives, water wells In the area were located, measurements of depths to ground water and mineral analyses of surface and ground water were made and evaluated, smd all available well logs were collected and analyzed. Geologic cross sections B-7 were constructed to show the configuration of the bottom of the basins and are shown on Plates 6-A and 6-B. In field mapping, particular care was given to the location of boundaries between water-bearing materials and nonwater -bearing materials. Since this was primarily a study of ground water, the nonwater- bearing rock areas were not investigated in detail. Work in this regard was limited to compilation of previous investigations and field checking, when needed, to coordinate the works of various authors. The older, less permeable, formations which yield little water are treated briefly. These rocks are mentioned because in locations where they occur they affect the chemical character and quality of the ground water. They influence the movement and occurrence of ground water, and they form or delimit, in part, the ground water basins in the Coastal Hydrologic Unit. The permeable water-bearing formations are described in greater detail. These deposits comprise the fill of the ground water basins, the principal sources of ground water in xhe watershed. Subsurface geology was interpreted largely from water well logs which were obtained from drillers and owners. Ground water level data and water analyses were amassed, and in certain areas the transmissibility of the sediments was estimated by field tests using purnping wells. All of these data were drawn upon freely in interpreting the geology. Existing published and unpublished reports were utilized in the preparation of this appendix and are listed in the accompanying bibliography. In the course of this investigation, a geologic map was prepared by compiling data from existing geologic maps, from aerial photographs, and from field mapping by personnel of the State Department of Water Resources. B-=8 The map presented as Plate 5 was prepared to provide a sound basis for deter- mination of the extent and nature of the water-bearing materials. B-9 CHAPTER B-II. PHYSIOGRAPHY The San Dieguito River watershed is located in the Peninsular Range Geomorphic Province. The ai*ea ranges from sea level on the western extreme to over 5,700 feet elevation on the eastern end of the watershed at Mount Volcan. The topography of the region as a whole may be divided into the highland region and the coastal belt,, each with a general north- west trend (Miller, 1935^). The San Dieguito River is just one of the many westward flowing streams in San Diego County that drains into the Pacific Ocean. Viewed in a broad way, the mountainous region of the San Dieguito River watershed may be looked upon as an eroded fault block which slopes toward the southwest and is dissected by many streams . The highland area stands out in the form of more or less well defined old erosional surfaces, separated by numerous gorges and canyons. The eastern front of the highlands, corresponding to the most easterly extent of the watershed, is a high steep eroded fault scarp, representing the southeasterly extension of the Elsinore fault system (Miller, 1935a). Transverse faults, associated with the Elsinore fault system, m8.rk the sites of some of the major valleys in the watershed. Within this area, the outstanding highland valleys are: Santa Ysabel Valley at an elevation of about 3,000 feet. Upper Guejito Creek area at 2,000 feet, and the Ramona area at about 1,U00 feet. Pamo Valley marks an eroded fault zone and San Pasqual Valley possibly a system of faults. The coastal area is a northwest trending band of marine and nonmarine sediments, about six miles wide, which lies between the ocean and the igneous and metamorphic rocks of the highland, area. Before erosion occurred, these sediments formed a flat, featureless area, remnants B-10 of which may be seen along ridge tops. Remnants of old terraces are found near the contact of sediments with the highland area. Overlying the sediments near the ocean are erosional remnants of old longitudinal beach ridges formed as sea level receded (Hanna^ 1926). The most prominent topographic expression in the coastal area is the San Dieguito Valley which was eroded by the ancient superimposed San Dieguito River and later back- filled to a depth of at least 200 feet. The valley walls rise precipitously from 100 to 3OO feet above the flat valley floor. As is usual in this type of semiarid climate^, the southern wall of this east -west trending valley is steeper than the opposite side and more densely covered with native vegata- tion. The sea floor in the San Diego -La Jolla area has been explored extensively by the Scripps Institute of Oceanogj-aphy, in cooperation with the United States Navy, from 19^3 to the present. In that area^, two major submarine canyons cutting the continental shelf have been discovered and explored . The shelf off the mouth of the San Dieguito River is relatively featureless and unexplored. The continental shelf in this area is about two and one-half miles wide;, with a maximum depth of about 500 feet at its western edge (Shepard, 1952). The continental shelf in the San Diego-La Jolla area has been formed on truncated beds of soft shales, limestones, and conglomerate o These beds have been correlated with the Tertiary beds on shore. A veneer of gravel and sand, probably of Pleistocene age, vmconform- ably overlies the Tertiary sediments (Shepard, 19^1). This probable holds true for the San Dieguito River area as well. During the last glacial period, when sea level was about 3OO feet feet lower than the current level and the San Dieguito River was actively excavating its channel, the valley extended for some distance across the B-11 shelf. With the postglacial rise of sea level the stream backfilled its channel to its present level. Tb.e old backfilled channel undoubtedly still extends across the continental shelf, filled now with sediments which axe in direct hydraulic continuity with the ocean. I B-12 CHAPTER B~III. GEOLOGIC HISTORY The geologic history of the San Dieguito River drainage area is one of some complexity, with many unrecorded chapters. A summary description of the formations and their relative ages is presented in chapter B-IV. The pregranitic rocks include the Santiago Peak Volcanics and associated sediments as well as older rocks of which little is known. These materials have been metamorphosed by injection of granitic magmas in Jurassic and Cretaceous times. Injection was accompanied by uplift and followed by erosion, removing most of the pregranitic materials. Although there are no Cretaceous sediments exposed in this area, the great thickness of marine sediments penetrated by wells near the present shore line suggests that deposition may have occiirred during middle to upper Cretaceous and possibly during the Paleocene. Throughout Cretaceous and Eocene time, erosion in the crystalline rock area was developing a more or less subdued erosional surface. Remnants of the surface are found throughout San Diego County. Materials eroded from the highland areas during late Cretaceous to late Eocene time were deposited mostly as marine sediments near the present shore line. By the end of the Eocene, several hundred feet of sediments had been deposited near the present shore line. Following Eocene deposition a slight regional upwarping of the land and considerable erosion occurred. Formation of "V" shaped valleys was probably initiated at this time. During the Miocene, the sea intruded upon the land, as is evident in other areas. In Pliocene and/or Pleistocene time, the sea receded in stages, developing prominent wave cut terraces. Part of the apparent movement was probably due to uplift of the land. As the sea receded. B-13 longitudinal beach ridges, which are now deeply dissected by erosion, were formed on the terraces. At the time of terrace development, the San Dieguito River was a meandering stream flowing across the surface of the Eocene sediments, and the "V" shaped valleys were undergoing further erosion. During Pleistocene time, the San Dieguito River entrenched its channel about 5OO feet into the Eocene sediments along the coast. This simple picture of downcutting was greatly complicated by several eustatic fluctuations of sea level, caused by melting and forming of the continental ice sheets o With the changes of sea level, several sets of terraces were formed in San Dieguito Valley. During the last glacial period (Wisconsin), sea level was about 300 feet below present sea level and coastal valleys were deeply eroded. Since Wisconsin time, sea level has raised causing deposition of sediments in the coastal portion of the region. During the 11,000 to 15,000 years (Shepard and Suess, 1956) following Wisconsin glaciation;, movement of the land has apparently been negligible. Inland valleys were also being developed during the glacial and interglacial periods of Pleistocene time. Changes in climate and movements of the land probably caused the develop- ment of terraces in Pamo and San Pasqual Valleys. The most recent activity has apparently been a slight relative rise in sea level, causing lagoonal conditions in the coastal area. Youthful gullies found in much of the watershed may be caused by a change in climate or by man's activities or both. Earthquakes in the region indicate that tectonic activity is still in progress, but surface expres- sion of active faulting has only been noted in the Elsinore fault system. B-14 CHAPTER B-IV. GEOLOGIC UNITS The water-bearing formations in the San Dieguito River watershed are divided for convenience and ease of description into the following: (l) permeable materials; (2) semipermeable materials; and (3) fractured rock. Brief descriptions and ages of formations are given on Table B-1 and in the legend of Plate 5° Areal extent of the formations is shown on Plate 5, entitled "Areal Geology". B"15 TABLE B-1 STRATIGMPHIC COLUMN FOR SAN DIEGUITO RIVER WATERSHED Age * Name of unit • 1 > • 'Symbol* • • Thickness ' Description Alluvium Qal. 0-200 feet Gravelj sand, silt and clay Quaternary 1 Beach and dune sand Qd 0-100 feet Sand and ironstone concretions o O N O Residuum Poway conglomerate La Jolla formation Leucogranodiorite Qr Tepc Telj Klg 0=100 feet 0-100 feet 1500-1800 feet Clayey sand with boulders of weathering Tertiary g Gravel J sand and clay Sand, shale^ some gravel Light grey medium grained, variable Cretaceous Granodiorite Tonalite Kgr Kt Light colored with flakes of dark minerals Dark;, coarse grained o •H o Gabbro Jurassic slates Kg Js Dark, coarse grained Interbedded with Santiago Peak Volcanics 03 Jurassic StoneinraM granodio= rites and associated metamorphics Santiago Peak Volcanics Intrusives related to Santiago Peak Volcanics Bedford Canyon formation and Julian schist Jst Jsp Jspi Tr Quartzite, gneiss, schist and grano- diorite Mildly metamorphosed agglomerates,, shales quartzitesj, tuffs Fine grained grey to black grano- diorite and basalt Trias sic Slates, argillites quartzites, limestone, and schist Permeable Materials Permeable materials discussed below include three geologic units; Recent alluvium, Beach and Dune Sands, and residuum. The alluvium was deposited as valley fill, while the residuum was developed as a weathering product of the underlying crystalline rock. Both the alluvium and residuum transmit water to pumping wells, but the yield of wells in the alluviiom usually exceeds the yield of wells in the residuiatio Beach Sands are in conta,ct with the ocean and probably contain sea water- The Dune Sands lie entirely above the water table and hence contain no usable water. Recent Alluvium Recent alluvium is found in the valleys of all of the principal streams along the coast. These stream valleys were excavated at a time when sea level was as much as 30O feet lower than at present, thus permitting the streams to excavate their ancestral channels <. Since this time of deep erosion, there has been a rise in sea level which caused the streams to aggrade their valleys. The alluvium is composed of gravel, sand, and clay derived from the drainage basins of the streams . In the inland valleys it was probably deposited due to factors other than change in sea level, such as regional tilting or climatic changes- Alluvium is the most important source of ground water for irrigation and domestic purposes. Beach and Dune Sands The beach and dune sands occur along the western margin of the San Dieguito River watershed. Because the beach sands are in contact with the ocean, and probably contain sea water, they were not considered in the hydrologic balance. Elongate dune ridges trend generally in a north-south B-17 direction, parallel to the coast. These dune sands are believed to lie entirely above the water table and hence yield no water to wells. Residuiim Most of the igneous rocks in San Diego County are coarse grained granitics which yield readily to weathering. In the.hi'ghlaWdl-QPfeasiVhei^fe thes^ rocks occur'i the' surface is''lmniediatelyi under lain-'byreBiduum, fcom- raonly knovn as decomposed granite. ■ ■■:■':•■ -i'..- . aTiji-.o . The granitic rocks, especially tonalite, weather to a well developed residual soil exhibiting four stages or zones . The first or most weathered zone is a structureless sandy clay or clayey sand, usually with no boulders of weathering. In the second zone, the boulders of weathering are subor- dinate, rounded, and surrounded by sandy clay and comprise less than 50 per cent of the volume. In the third zone, the boulders are dominant, rectan- gular, and locked. Here they comprise 50 to 90 per cent of the volume. In the fourth zone, the least weathered, there is minor residual debris along the major structural planes which may be considerably iron stained (Ruxton, 1957) • Decomposition is most advanced at the surface where the rock has been completely reduced to soil and it decreases downward to the solid granite at depths in some areas to well over 100 feet. Residuum is considered as Quaternary age in this report; although it is reasonable to assume that the residuum was also formed during much of the Tertiary period. Although the yield of wells in the residuum is comparatively low, it is widespread and was mapped as a water-bearing unit in this investigation. Nearly all of the granitic rock areas have at least a thin discontinuous vineer of residuum on them. In many instances, the residuum lies above the ground water surface and is not a significant contributor of ground water. B-18 Semipermeable Sediments Semipermeabis secliiiients are those vrhich generally yield only enough water for limited domestic use and which r.Tay contain water of poor quality. Tlie Poway conglomerate (xnd the La Jolla formation are geologic units included in this group and are both of Eocene age. Poway Conglorr.erate The Poway conglomerate consists of lenses of conglomerate, sand, and clay and is capped by a ohrck bed of rounded pebbles and boulders up to v,hree feet in diameter. Sovne of the clays have yielded marine fossils, but the Poway is considered to be mostly of nonmarine origin (Hertlein, 195^, Bellemin and Merriara, l^^B) . Because of i^s dense character and position, generally above the ground water surface, no know:: water is dsrived from this formation. L'ue to tight cemer.taticn and dense cobbles the conglomerate is ordinarily difficult to drill. Tl'e P:>way conglomerate ranges up to 100 feet in thickness in mos'^; of the areas of outcrop in the San Dieguito River watershed = La Jolla Formation Tlie La Jolla formation of Eo:;ene age underlies the Poway con- glomerate and consists of the following three members in upward sucession: (l) the Del Mar sand; (2) the Torrey sand; and (3) the Rose Canyon member. These members are not differentiated on Plate 5' The Del Mar sand, about 200 feet thick, is a greenish-grey or reddish, poorly consolidated sand and sandy shale, and is fossiliferous near the coast. It is often lenticular, cross bedded and is of both nonmarine and marine origin (Hanna, I926) . The Torrey sand is white to light grey or brown in color ;, massive, clean, appar- ently without fossils, and about 100 feet thick. The Rose Canyon member is B-19 composed mostly of marine and nonraarine sands with minor amounts of gravel and clay. Verbal communication with Dean Milow of San Diego State College (1958) indicates that he considers the Rose Canyon member as a formation having a maximum thickness of about L,500 feet. The La Jolla formation yields water from all of its sands and gravels, but only in minor amounts, and few wells are drilled into it. The water is mostly very poor in quality and is probably a mixture of saline connate water and slowly percolating meteoric water. The La Jolla formation is slightly distorted and dips gently east- ward overlapping the igneous rocks to the east. Faulting is common throughout the coastal area with small displacements. Data are not available to deter- mine whether significant barriers to movement of ground water exist in this area. Underlying the La Jolla f oraiation and extending to great depths are sediments which may be Paleocene or Cretaceous in Age. These older sediments are, however, of little cons equience because w&ter contained there- in is not presently being put to beneficial use. Fractiired Rock The fractures, crevices and joint systems in massive rock some- times yield water to wells. While wells generally obtain only limited supplies from this source, the water obtained is usually of good quality and is used widely for domestic purposes. Wells have probably been drilled into all of the granitic rock units described hereinafter. Of these rocks, tonalite yields the greatest quantity of water because it is usually overlain with a mantle of residuim which retains ground water and acts as a storage reservoir for the fractures. B-20 Descriptions of the following rock types are taken largely from, Larsen, Jr.^, E. S., tverhartj D. L. and Merriajn^ Richard, "Crystalline Rocks of Southwestern California"^ Department of Natural Resources, Division of Mines, Bulletin No« 159, 1951o Leucograndiorite Leucograndiorite is limited in areal extents It is fine grained, very light grey on fresh surfaces, and yellowish on weathered surfaces. The light colored outcrops show rounded boulders of weathering with meager soil cover. The boulders are not as prominent as ^he boulders of weathering of the granodio- rites . Leucogranodiorite is imprevious and yields water only from fractures and joints. Granodiorite Granodiorite comprises the most rugged outcrops of the areac It forms grey to white boulders of weathering as large as 15 feet in disimeter. Most of the area of greatest relief is underlain by granodiorite. Hand specimens reveal abundant tablets of white feldspars and some small flakes of biotite in a fine- grained groundmass = Granodiori^e is impervious and yields water only from fractures and joints. Tonalite Tonalite or quartz -diorite is a mediiam grained, grey to dark grey rock, and shows characteristic outcrops of boulders of weathering in a deeply weathered matrix. Soils in tonalite areas are generally darker red than in other rock type areas . The dark grey boulders are often weathered completely free from the parent rock and are common in the outcrop area. Most of the low brush covered hills with many rounded bouldery outcrops are underlain B-21 by tonalite. Although the tonalite itself is impervious, except for fractures and joints, it is the source of the deepest residuiiin from which large quantities of water are extracted. Gabbro Gabbro occurs locally in many areas . The outcrops are uniformly massive, grey to black, and usually show a banding or streaking of white or clear feldspars . Residual soils form on the gabbro in much the seune manner as on the tonalites, but the soil is not as deep as the latter and the color is characteristically darker. Gabbro is impervious and yields water only from fractures and joints. Jiorassic Slates Jurassic slates are interbedded with the Santiago Peak Volcanics . They are thin bedded, dark grey in color, and slabby in outcrop with little or no soil cover. These slates would yield water only from fractures and joints, although no wells are known to penetrate them. Stonewall Granodiorites and Associated Metamorphics These rocks form bold, light grey outcrops. They include grano- diorite gneiss, slate, schist, and quartzite. Much of this older crystalline and metamorphic rock has been deeply weathered to a well developed residuum. These rocks are impervious and yield water only from fractures and joints. Santiago Peak Volcanics Santiago Peak volcanics are a mildly metamorphosed series of agglomerates, shaled, quartzites, tuff s^ red and black andesites, and quartz latites.. There are alsoi*6me,rhy61it66> a? little 8late> apd probably B-22 some basalts . The outcrops are slabby to blocky with little residual soil cover . The steeper slopes are generally talus covered. The Volcanics are impervious and yield water only from fractures and joints. Intrusives Related to the Santiago Peak Volcanics These intrusives are believed to be of the same age as the Santiago Peak volcanics and are usually small bodies of granodiorite and related rocks. They are, for the most part, fine-grained rocks which form blocky to sub- angular outcrops and the cores of small rocky hills . These rocks are imper- vious and yield water only from fractures and joints . Bedford Canyon Formation and Julian Schists These rocks are mildly metamorphosed slates and argillites with some quartzites and schists and a few thin lenses of limestone. They often form bold, steep outcrops, and are penetrated by pegmatites which carry gold and semiprecious gem minerals. These rocks are impervious and yield water only from fractures and joints. B-23 CHAPTER B-V. STRUCTURE On the eastern end of the San Dieguito River watershed is a high, steep, eroded scarp forming the western side of Volcan Mountain. This scarp represents the southeasterly extension of the Elsinore fault system, which has been active at least since Tertiary time. Associated with this great fault are many minor transverse faults (Saver, 1929)- The summit of this fault block is generally a well preserved erosional surface into which streams have cut many gorges and canyons (Miller, 1935)- Some of the canyons have been eroded into rocks weakened by transverse faults . Although there are a great many faults in the area, only a few of them are easily mapped. Most of the faults are evidenced only by topographic features such as alignment of saddles, springs ^i. of feet f drainage patterns, or "V" shaped valleys. Of the numerous structural features in the region, only Temescal fault significanyly effects ground water movement. This fault extends through Pamo Valley and into Ramona Basin. It is evidenced by an alignment of saddles at both ends of Pamo Valley, a brecciated zone on the southern edge of Ramona Basin, and an alignment of rock outcrops across the basin. Ground water con- tours indicate that the fault forms a partial barrier to the free movement of ground water, which has resulted in the formation of numerous springs in the fault zone. Well logs also indicate the approximate location of the fault zone, shown on Plate 6-B, and water of poor mineral character is obtained from wells in this zone. The frequent movements of the fault blocks have fractured the rocks extensively. It is probable that in this region there are fractures or joints in every crystalline rock. Wells penetrating these bodies of rock may inter- sect these fractures, and appreciable quantities of water are occassionally B-2l4 obtained in this manner . Water found in bedrock is derived from deep penetration of meteoric water. The Eocene sediments near the coast have been tilted slightly land- ward since their deposition (Hertlein, 19^3) and are gently folded. There are many minor faults in the coastal sediments, which appear to be local, normal faults with displacements in the range of tens of feet. I B-25 CHAPTER B-VI. DESCRIPTION OF GROUND WATER BASINS There are five ground water basins in the San Dieguito River water- shed of sufficient size or importance to merit investigation, and they are discussed at some length in this chapter. Fifteen smaller bodies of alluvium or residuiim are also briefly described herein. In areas surrounded by Eocene sediments, the extent of the water- bearing alluvium was easily delimited at the contact between the alluvial fill and the adjoining sediments. In the valleys cut in crystalline rock and filled with alluvium, the boundaries of the water-bearing material are somewhat more indefinite, due to the presence of residuiom on the surround- ing slopes. The residuxom has, in many cases, slid or washed onto the alluvixim masking the exact contact. In many instances, a part of the residuvun was included in the ground water basin. The highland valleys containing residuum presented the greatest problem in establishing a ground water basin boundary since, in most cases, the residuum continues from the basin into the adjoining hills where it is usually above the water table. The following criteria were used for including residuum within a ground water basin: (l) presence of wells; (2) relatively gentle ground slope; and (3) lack of outcrops. To facilitate discussion, the basins are described under the hydro- logic unit in which they occur. Location of ground water basins are shown on Plate k. Descriptions of these basins are shown in Table B-2 and the characteristics and other pertinent data are contained in Table B-3. Table 10, page 57, in Volume I, lists the number of active wells and ground water extractions from basins in San Dieguito River watershed. 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The San Dieguito ground water basin is found in this linit, as shown on Plate k. San Dieguito Basin The San Dieguito Basin, comprising an area of about 3>910 acres, underlies San Dieguito River Valley in the extreme west central portion of the Coastal Hydrologic Unit. The floor of San Dieguito Valley with an average elevation of 25 feet, is underlain by Recent alluvium and is extensively used for irrigated agriculture. Geology . The valley is cut into the La Jolla formation of Eocene age, and backfilled to depths of as much as 200 feet with Recent alluvium. The alluvium in the San Dieguito Basin consists of stream-deposited gravel, sand, and clay. It is underlain and flanked by older Eocene formations, and is shown on Plate 6-A. The base of the alluvium is difficult to determine from the available well logs. The alluvium in the west end of the valley has a high clay content. There are numerous minor faults and folds in the older formations surrounding the basin but none of these are known to affect the movement of ground water. The alluvium is apparently unaffected by faulting. Occurrence of Ground Water . Ground water occurs in the alluvial fill of San Dieguito Basin and in the sands of the older formations that flank and underlie the alluvium. Alluvial fill constitutes the principal aquifer . B-.V+ In cross -section, the alluvium of San Dieguito Basin is known to be shallow near the perimeter of the basin and to increase rapidly in thickness toward the center, as illustrated on Plate 6~k. Near the westerly extremity of the basin the alluvium at shallow depth contains considerable clay and silt. These fine materials ser'/e to partially confine the underlying ground water. Wells drilled through these materials show artesian characteristics « In the eastern portion of the basin, however, unconfined water table conditions are found . Movement of Ground Water o Ground water in the alluviiom of San Dieguito ifesin has generally moved westward toward the ocean. However, a landward gradient caused by heavy pumping, has existed in recent years. In the fall of 1957 ji a trough in the ground water surface was detected, located in Section 5> Township Ik South, Range 3 West, S.B,B« Ss M. West of this trough, sea water moves east- ward into the basin as a result of the landward hydraulic gradient. There is some exchange of water between the alluvium and the surrounding Eocene sediments. At times of high ground water levels, wells in the Eocene sedi- ments yielded water of good quality and were widely used. In 1957? slowly perco- lating water high in dissolved solids was migrating from the Eocene sediments into the alluvium. Replenishment and Depletion of Ground Water , Ground water in the allu- vium of the San Dieguito :&isin is replenished by percolation of direct pre- cipitation, stream flow, and the unconsumed portion of water applied for irrigation and other uses. An additional source of replenishment is subsurface inflow from the older formations bordering the basin. Sea water intrusion constitutes an undesirable source of replenishment. Ground water in the adjacent older semi- permeable formations is replenished by rainfall penetration, stream percolation, and return flow of applied local and Colorado River water. B-35 The ground water of the basin is depleted by pumped extractions, consumptive use, and at times of high water level, subsurface outflow. Subsurface Outflow and Inflow . During the past, before extensive utilization of the ground water basin, when a seaward hydraulic gradient existed, subsurface outflow occvirred through the biuried mouth of the San Dieguito River. During the current period of overdraft, ground water levels and water quality indicate that some subsurface inflow enters the alluvial fill of the San Dieguito Basin from the ocean and from adjacent older formations . Ground Water Storage Capacity and Specific Yield . Estimated weighted mean specific yield of the alluvium in the basin is 13.^ per cent. The specific yield of a sedimentary deposit is the ratio of the volume of water which it will yield by gravity, after being saturated, to its own volume. Historically utilized storage capacity in the basin was approximately 13,000 acre-feet, with the average elevation of the water table being about 12 feet below sea level. Storage capacity utilized below sea level was about 5,000 acre-feet. If the formation of a landward hydraulic gradient and accompanying sea-water intrusion is to be prevented, only about 8,000 acre-feet of storage can safely be utilized. Yield of Wells . The average yield to domestic and irrigation wells is about 250 gallons per minute. The alluvium of San Dieguito Basin yields an average of 5OO gallons per minute to irrigation wells with large pumps . The maximum known yield is about 6OO gallons per minute. Other Area In the Coastal Hydrologic Unit, there is one other small area of alluvium from which ground water is extracted. This area, La Jolla Valley, B-36 was not studied in detail due to the lack of significant ground water development; it is, however, delineated on Plate k. Other pertinent information concerning this area is shown on Table B-2, B-3, and on Table 10, Volvime lo About 20,000 acres of the Coastal Hydrologic Unit are underlain by Eocene sediments from which minor amounts of ground water are extracted. It is reported that^ two wells approximately I-I/2 miles south of Lake Hodges flowed under artesian pressure at the time they were drilled o Water from these wells was of excellent mineral quality. Most of the wells, however, have low yield and produce poor quality water. Because of a lack of development, doubtful quality, meager quantity, and inadequate data, the Eocene sediments are not considered herein as a ground water basin. This area is shown on Plate 5- I B-37 Central Hydrologlc Unit The Central Hydrologlc Unit is located between the Coastal Hydrologlc Unit to the west and the Inland Hydrologlc Unit to the east. It is underlain primarily by crystalline rock and to a lesser degree by alluvium in the stream channels and flood plains and by residuum on the heavily weathered slopes. Principal ground water basins within this unit include San Pasqual Basin, Lake Hodges Basin, and Felicita Basin. Locations of the basins in this unit are shown on Plate k. Other portions of the Central Hydrologlc Unit contain relatively small areas of shallow water-bearing materials. Water wells in such areas are usually shallow and have low yields. Some wells in these areas obtain water from fractures and broken zones within the crystalline rock* San Pasqual Basin This basin, with an areal extent of about 3>^30 acres, lies in the central portion of the Central Hydrologlc Unit and to the northeast of the San Dleguito Basin. The main basin averages about 390 feet in elevation and is drained soutwesterly by the San Dleguito River. Geology . San Pasqual Valley is a comparatively long, narrow valley bounded and underlain by crystalline rock. Bedrock on the north is mostly tonallte with some metamorphic rocks, which rises gently in elevation, pre- senting slopes covered with a thin discontinuous layer of residuum. To the south, the valley wall consists of granodiorite and gabbro, and rises much more sharply and to a higher elevation than the north wall. The valley fill consists of a maximum of at least 200 feet of course sand and gravel with some fine sand and clay as shown on Plate 6-B. Some of the available well logs show that there are cobblestones at depths B"3B of over 100 feet, probably indicating an old stream channel. A few logs terminate in a layer of residuum,, indicating a period of weathering before the valley was backfilled. San Pasqual Valley is believed to be at least partly fault controlled. This hypothesis is supported by exploratory drilling at the narrows at the south- west end of the valley, which revealed subsxirface fractures. Faulting is inferred by such at surface expressions as alignment of saddles and "V" shaped side canyons. Tne valley, 3,000 or more feet in width;, makes a sharp turn to the south just before it enters the narrows where the width decreases to 1^000 feet. Here the walls rise steeply 200 feet on the west side and 700 feet on the east side. Occurrence of G round Water. Unconf ined ground water occurs in the alluvium, which is the chief source of water to wells in the area^ The residuum bounding the valley also contains unconfined ground water,, but it generally yields less water to wells. M ovement of Ground Water . Ground water moves through the alluvivim following the slope of the stirface drainage toward Lake Hodges Basin as shown on Plate 7-Ao There is no evidence suggesting any barriers to the movement of ground water in this basin, except for the constricting effect of the bedrock narrows at the western end. Replenishment and Depletion of Ground Water . Ground water in San Pas- qual Basin is replenished by percolation of both stream flow and direct precipi- tation. There is probably minor subsurface inflow from the fractured granitic rocks. There is usually some tributary stream flow,, fed by springs in the hills, until early in the summer. These streams do not reach the main valley, but percolate into the alluvium in the side canyons. Ground water is depleted by pumped extractions, consumptive uses, and subsurface outflow through the narrows into Lake Hodi?es Basin. B-39 Subsurface Inflov and Outflow . Subsurface flow into San Pasq\ial Basin is probably negligible. The outflow, however, has been estimated by the slope-area method described in Chapter B-VIl, to be about 600 acre-feet per year in 1956-57- A portion of the subsurface flow passing through the narrows at the lower end of the basin is being pumped by a battery of irri- gation wells at the boundary between San Pasqual and Lake Hodges Basins. Ground Water Storage Capacity and Specific Yield . Estimated weighted specific yield of the alluvium in the basin is 21 per cent. Maximvim histori- cally utilized storage in the basin was approximately 13,000 acre-feet and occurred in the fall of 1957 • Usable storage capacity is estimated to be 37,000 acre-feet which would result in an average depth to water of about 75 feet. Yield of Wells . Irrigation and domestic wells in the San Pasqual Basin yield an average of about 600 gallons per minute. Maximum known yield is about 1,700 gallons per minute. Most of the large irrigation wells yield on the order of 1,000 gallons per minute. Lake Hodges Basin Lake Hodges Basin, which comprises a surface area of about 3j350 acres, ranges in elevation from 190 feet at the foot of Hodges Dam to U50 feet south of the City of Escondido. This basin, about 1,100 acres of which is inundated >by Hodges Reservoir wheni the' lake is 'at spillway elevation, occupies the San Dieguito River channel and immediately adjacent areas of residuum. The location and areal extent of this basin is shown on Plate U. Geology . Lake Hodges Basin, drained southwesterly by the San Dieguito River, lies in a rather complex area of igneous and metamorphic rocks. These granitic and metamorphic rocks surround and underlie the 1 B-40 ■water-bearing materials. Tne elevation of the crystalline rocks bordering the western end of this long narrow basin varies from 700 to 90O feet. In the east- ern end of the valley, because of the less resistant nature of the rock, the relief is less, or about 3OO "to ^00 feet. Water-bearing formations within the basin may be divided into alluviim and deeply weathered residuum. The alluvium in Lake Hodges Basin consists of streeim deposited gravel, sand, and clay up to at least 80 feet in thickness, as shown on Plate 6-Bo A north- ward extending arm of residuum was included in this basin because of its hydraulic continuity with the alluviim. The residuum is typical of the deeply weathered material of the watershed, and is about 50 to 70 feet deep. Occurrence of Ground Water » Ground water occurs in the alluvium and residuum. Yields of wells in the portion of the basin underlain by residuum are low, but due to the denser population this area contains a greater number of wells. In addition, Hodges Reservoir overlies a large portion of the alluvium. Free ground water conditions prevail in both the alluvium and the residuum. The water level maintained in Hodges Reservoir controls, to a large extent, the level of the water table in the remainder of the alluvial portion of Lake Hodges Basin. Movement of Ground Water o Movement of ground water in the alluvium and residuum follows the slopes of the surface drainage as illustrated on Plate 7-D. Movement is, to some extent, controlled by the water level in Hodges Reservoir. When the lake is low the movement of ground water is toward the reservoir, but when the water level of the lake is raised rapidly, the movement of ground water may be reversed for short periods of time, until the dewatered storage space is filled. Replenishment and Depletion of Ground Water . Lake Hodges Basin is replenished principally by surface and subsurface inflow from San Pasqual Basin » B-Ul through the narrows. Replenishment of smaller magnitude also occurs by sub- surface inflow from Felicita Basin, through the five small valleys which drain it. Percolation of precipitation and stream flow also contributes to the ground water of the basin. In times of heavy pumping, an eastward gradient could be developed which would allow water from Hodges Reservoir to percolate to the east. Ground water in the basin is depleted through pumped extrac- tions and subsurface flow into Hodges Reservoir. Consumptive use also accounts for some of the depletion of the ground water. Subsurface Inflow and Outflow . Subsurface inflow occurs from Felicita and San Pasqual Basins. Inflow from Felicita Basin has not been quantitatively determined, but an estimated 600 acre-feet of water a year flows into Lake Hodges Basin from San Pasqual Basin. There is a very small amount of leakage under or around Hodges Dam, however, there is no other known subsxorface outflow from Hodges Basin. Ground Water Storage Capacity and Specific Yield ,, Estimated weighted specific yield of the residuum and alluviiim of the basin is I6.5 per cent. Historically utilized storage in the basin is approximately 1,500 acre-feet . Yield of Wells . Irrigation and domestic wells in the basin yield on an average of about 80 gallons per minute. The maximum known yield is about 800 gallons per minute. Most of the irrigation wells yield on the order of 95 to 100 gallons per minute. Felicita Basin Felicita Basin has an areal extent of about 3,^00 acres and lies on the northern watershed boundary, as shown on Plate h, at an average elevation of about 68o feet. The basin drains southerly through five narrow channels into Lake Hodges Basin. The City of Escondido is situated in a portion of this basin o Geology o The principle water-bearing formation in this basin is the deeply weathered residuum developed from tonalite. The residuian of the basin is weathered to depths of from 50 to TO or more feet. Even though the residuum has a low specific yield, it does constitute a major source of ground water for irrigation and domestic use in the basin. Many of the wells have been drilled into the crystalline rock which underlies the basin and extract water from fractures and crevices in the rock. The entire area is surrounded and underlain by tonalite p .except on the northeastern corner where there is a body of granodiorite . In this area of granodiorite, the relief and elevation is considerably greater than the remainder of the basin because of the greater resistance of the granodiorite to weathering and erosion. Occurrence of Ground Water. Unconfined ground water is extracted from the residuum of the basin, as well as from fractures in the crystalline rock which underlies the basin. Movement of Ground Water . Ground water moves in a southerly direc- tion from Felicita Basin into Lake Hodges ^sin, as shown on Plate T-D. The movement of water is through five narrow channels where water rises to the surface due to shallow depths to bedrock and flows throughout the winter months. It is reported that, before irrigation water was imported into the basin, the channels were dry except for runoff from storms. Replenishment and Depletion of Ground Water . The principle sources of replenishment are percolation of direct precipitation and the unconsumed 1 I B-43 portion of applied irrigation water o Use by phreatophyteSj, pumped extractions, and subsxarface outflow account for the depletion of ground water. Subsurface Inflow and Outflow . There is no subsurface flow into Felicita Basin from the adjoining areas. Subsurface outflow does occur through the afore-mentioned five narrow channels into Lake Hodges Basin. Wells in the residuum and alluvium of the chajonels extract large amounts of water for irrigation and domestic use. These wells are the highest producers in the area and probably facili- tate the subsurface flow by increasing the gradient of the ground water in their area of influence. Ground Water Storage Capacity and Specific Yield . Estimated weighted specific yield of the residuum in the basin is 8 per cent. His- torically utilized storage in the basin is approximately 9,000 acre-feet. Yield of Wells . Irrigation and domestic wells in the basin yield an average of about 65 gallons per minute. Most of the irrigation wells yield on the order of 100 gallons per minute. The maximum known yield is about 300 gallons per minute. Other Areas There are six other areas of residuum and alluvium in this unit which are delineated as ground water basins and shown on Plate k. These are Hidden, Reed, Green, Highland, and East and West Guejito Basins. Because of their small size or lack of information, these basins are not discussed further in this report. Other infirmation concerning these areas are shown on Tables B-2, B-3, and on Table 10, Volvane I. B~U Inland Hydrologic Unit The Inland Hydrologic Unit is an area of deeply dissected old erosion surfaces which lie between the Central Hydrologic Unit and the eastern extreme of the San Dieguito River watershed o Residuum and minor amounts of alluvium comprise ground water basins in this lonito The Rsunona Basin is the largest and most productive of these and is the only one discussed in xhls report. The location of this basin is shown on Plate k, Ramona Basin Ramona Basin includes an area of about lYjllO acres, stands at an average elevation of about 1,^00 feetj, and lies southeast of San Pasqual Basin in the western portion of the Inland Hydrologic Unito Ramona Basin is drained northwesterly by Santa Maria Creek and Clevenger Canyon Creek into San Pas- qual Valleyo Geology o Ramona Basin is bounded on the west by granodiorite and elsewhere by tonaliteso The surface of the basin is underlain by weathered residuum which was formed on the underlying tonalites and granodiorite . A thin discontinuous layer of residuum covers the hills which siirround the basin. Most of Ramona Basin is drained by Santa Maria Creek and a small area is drained by Clevenger Canyon Creek. It is probable that Clevenger Canyon Creek at one time drained a much larger portion of the basin. Its canyon was probably eroded by a much larger stream than currently exists. It is also probable that the canyon between Ramona Basin and Pamo Valley once drained a part of Ramona Basin^, even though it does not presently support a stream. From this evidence, it is believed that the entire plateau which is now Ramona Basin was tilted southwestward at some time in the geologic history of the region. Extending from Pamo Valley into Ramona Basin is the Temescal fault. B-i+5 which is described in some detail in Chapter B-V, entitled "Structvire". There are other smaller faults in this basin which are delineated on Plate 5« Occurrence of Ground Water . Ground water is derived principally from wells tapping the deep residuum, however, there are a number of wells which extend down into the bedrock and extract water from fractures in the crystalline rock. Certain small areas of alluvium along the streams con- tribute minor amounts of ground water. Movement of Ground Water . Ground water in Ramona Basin is uncon- fined and moves parallel to the slope of the ground surface. In the eastern portion of the basin, the Temescal fault, shown on Plate 6-B, controls the movement and gives rise to high ground water level conditions. Movement of ground water in the fall of 1957 is depicted by contours on Plate 7-C. Replenishment and Depletion of Ground Water . Ground water is replenished by percolation of stream flow and direct precipitation as well as by the unconsiomed portion of water applied for irrigation and other uses. Facilities are now under construction for importing Colorado River water to the basin. The ground water basin is depleted by pumped extractions, consumptive use and subsurface outflow. Subsurface Inflow and Outflow . A limited amount of subsurface flow enters the basin through the alluvium of Hatfield and Goose Creeks in the east and northeastern portions of the basin, respectively. Outflow occurs through the thin alluvium of Santa Maria Creek in the western end of the basin. Some leakage may occur from the basin through the Temescal fault into Parao Valley. Ground Wate^' Storage Capacity and Specific Yield . Estimated weighted specific yield of the residuum in the basin is eight per cent. Historically utilized storage in the basin is approximately 20,000 acre-feet. B=46 Yield of Wells . Wells in Ramona Basin yield an average of about 50 gal- lons per minute. Most of the irrigation wells yield on the order of I50 gallons per minute. The maximum known yield is about 25O gallons per minute. Other Areas There are eight other ground water basins in the Central Hydrologic Unit which are delineated on Plate 4. These areas are Upper and Lower Hatfield, Wash Hollow, Ballena, Pamo, Santa Ysabel, and East and West Santa Teresa Basins. Other pertinent hydrologic data for these basins are shown on Tables B-2, B-3 and on Table 10, Volume I. i I B-i+T CHAPTER B-VII, PROCEDURES FCR ESTIMATINO mourn WATER STORAGE AMD SUBSURFACE FLCW The purpose of this chapter is to explain the procedure used to estimate quantitative values of ground water storage and subsurface flow. Ground Water Storage Ground water is stored within the interstices of sediments and in cracks or fractures of solid rocks. The changes in ground water storage occurring over selected periods of study were estimated for the more important ground water basins within the watershed. With the exception of San Pasqual Basin^, the available historic water level data were meager. In general, the estimates required, first, a determination of the change in the volume of saturated sediments that occurred over a selected period of study, and second^ an estimate of the percentage of this volume that contained extractable ground water. The first factor was obtained by computing the volume of sediments that lay between water levels that existed at the start and close of the study period, and the second factor, by evalu- ating, from available well logs, the average weighted specific yield of the sediments between water levels. Changes in the qtiantities of water stored were computed by multiplying the change in volume of saturated sedi- ments by average weighted specific yield. The State Division of Water Resources, predecessor agency to the Department of Water Resoiirces, had previously conducted extensive field and laboratory investigations for the purpose of assigning specific yield values to various types of materials found in valley fill. These materials have been correlated with descriptive terms found in well logs. The pro- cedures and conclusions are presented in Bulletin No. 1+5, "Geology and Ground Water Storage Capacity of Valley Fill, South Coastal Basin", Division B=U8 of Water Resources, 193lio Variations dictated by judgment and research, sup- plemented by values appearing in the "Hydrology Handbook" , Manual of Engineer- ing Practice No» 28^ 19U9, of the American Society of Civil Engineers, were adopted for use in this investigation <> The task of assigning specific yield values to the sediments indi- cated in well logs was simplified by dividing all basin sediments into nine genersuL categories. These included clayj sandy clay, silt, fine sand, sand, gravel, tight gravel, boulder clay, and decomposed granite. Sand, gravel, and clay, constituting the bulk of the alluvium, were generally foiind to be well differentiated on the logs. The specific yield value used for residuum was that assigned in Table B'=ii \inder the classification decomposed granite. Combinations of these materials, however j, were frequently described by such \inique terms as "ooze", "muck", "sea mud", etc. Materials so described were placed, based on judgment, into one of the above nine categories. Table B-U contains specific yield values assigned to the nine categories. In certain instances^ these values were altered slightly whenever field observations indicated the advisability of change. TABLE B-k SPECIFIC YIELD OF WATTO- BEARING MATERIALS B-49 Material Classification Assigned Specific Yield Value Clay Sandy clay Boulder clay Decomposed granite Silt Tight gravel Fine sand Gravel Sand Clay Soil, sea mud, silty clay. Hard, fine, firm, and variegated decom- posed granite Clay and gravel, medium hard, soft, and medium fine decomposed granite An average figure to cover the range of typical decomposed granite Sandy soil. Coarse, medium, soft decomposed granite and decomposed granite with clay streaks Cobbles, sand with clay streaks, packed sand with rocks, sandy mud, and alluvial decomposed granite Very fine sand and silty sand Fine, medivim, and coarse gravel Medium, coarse, very coarse sand, and gravelly sand .01 .05 .07 .08 .10 .11+ .20 .22 .30' Subsurface Flow Two methods are in common use to determine the magnitude of sub- surface flow. These are the slope-area method and the rising water method. Since there is presently no rising water of appreciable quantity occurring in the San Dieguito River watershed, this method was not used. All estimates given herein were based on the slope-area method. The slope-area method is derived from the commonly used form of Darcy's Law, Q;=PAI, where Q equals subsurface flow in gallons per day passing B-50 through the cross sectional area A in square feet, P is permeability in gallons per day per square foot, and I is the slope of the gro\and water surface at the corss section in feet per foot. Field tests using pumping wells to determine permeability were conducted where possible. These data are summarized in Table B-5. Permeability was com- puted by the use of nonequilibrium methods, as outlined in the State Division of Water Resources "Report of Referee", dated June, 1952, in the action entitled California Water Service Company , a corporation, et al., plantiffs, vs. City o:^ Compton , et al., defendants ^ Case No. 506806, in the Superior Court of the State of California in and for the County of Los Angeles. Slight variations in methods as suggested by Wenzel (19^2) and Jacob and Cooper (19^6) were used where necessary. In general, the recovery and the drawdown methods were used depending on field conditions. These methods depend on time-rate of recovery after pumping stops, and time-rate of drawdown in an observation well during pianping. B-51 CO E^ I m to O 0) 0) -P O -H CO O O -.OJ cd >5 H +J 5 PL| ^ -H T) m U -P O ^ 05 -H i >5H -P •H -P si <)H B ^ -H T) o -p 0) a -p CO Eh m H H :2 u H (U 03 ;3 03 CO H H O o O o o oo O CO o -4- I>- c~- 00 CO VD O O O o -4- o •H -P 03 3^ CO CO m oo CO £d (0 03 PL. CO O o o (M H CI O •H P 03 ^d O O t> H (U (U > fl 0) gj to > 03 -H tfl > p o o CO CO CO oo I I oo oo CO CO oo oo O -P _ •H a :3 3 bO-H 0) > •H 3 PI H CO OJ o o o o o\ a o •H >^ I -p ^1 ^ 03 (U O > H > U ,-i o a OJ 0) to > OJ ir\ o o oo ro OO OO I I oo oo CO CO oo oo M H O -p •H > G d CO o fn -P 0) 1^-^ > a a* a 0) 0) jn !» > H rH a 03 -H •H -P ^H fl (U 0) +J CO ol w a (u O Q -H a -p ^■■^ G -^ o -P o •^ Jh ^ (U 0) t3 -P G oi ;d »> ^ vi • O -P O >j O •P tH •H -P i o3 w O t:) -h •H Q) tH G H •H •H OJ O <1H > 0) pp. 51-115. 1951. ♦Fairhanlcs, H. \J. "Geology of San Diego County and Portions of Adjacent Counties". California Mining Bureau, 11th Report, pp. 7^-120, Map pl. 120, 1:375,000. I893. *Hanna, M. A. "Geology of the La Jolla Quadrangle". University of California, Department of Geological Science Bulletin, Vol. I6, No, J, pp. l87-2i»'6, Map pl. 2k6, ,1:62,500. 1926. Hershey, Oscar H. "The Quaternary of Southern California". University of California, Department of Geological Science Bulletin, Vol. 3> No. 1, pp. 1-29. 1902. ♦Hudson, F. 3. "Geology of the Cuyamaca Region". University of California, Department of Geological Science Bulletin, Vol. I3, No. 6, pp. 175-252, Map pl. 182, 1:62,500. 1922. Ilerblein, L. G. and Grant, U.S. "Southv/estem San Diego County^'. Department of Natural Resources, Division of Mines, Bulletin No. II8, pp. 367-369. 19^3. ♦Ilcrtlein, L. G. and Grput, U. S. "Geology of the Oceanside-San Diego Coastal Area, Southern California". Department of Natural Resources, Division of Mines, Bulletin No. 170, Chapter II, pp. 53-63. 195U. "-^. Jacob, C. E, and Cooper, H. H. "A Generalized Graphical Method for Evaluating Formation Constants and Summarizing Well Field History". American Geophysical Union Transactions, Volo 27, NOc k, pp. 526-53I+. I9U6. *Jahns, R. H« "Geology of the Peninsular Range Province, Southern California and Baja, California". Department of Natural Resources, Division of ■ Mines, Bulletin No. I70, Chapter II, pp. 29-5O. 195^.. *Jahns, R. H. and Merriam, R. "Northern Part of the Peninsular Range Province". Geologic Guide No, 5. Department of Natural Resources, i Division of Mines, Bulletin No, 170, pp. U2-U3. 195^» " Jenkins, 0, P. "Outline of Stratigraphic Record of California", Mineral Information Service, Vol. 5, No. 3, pp. 1-8. 1952. Lawson, A. C. "The Post - Pliocene Diastrophism of the Coast of Southern California". University of California, Department of Geology Bulletin, I Vol, 1, Noo h, pp, 115-160. 1893, *Larsen, Jr., E. S. "Batholith and Associated Rocks of Corona, Elsinore, and San Luis Rey Quadrangles". Geological Society American Memoir 29, pi. 1, 1:125,000. 19kQ, *Larsen, Jr., E. S, "Crystalline Rocks of the Corona, Elsinore, and San Luis Rey Quadrangles, Southern California", Department of Natural Resources, Division of Mines, Bulletin No, 159, pp. 7-^9, pl. 1. 1951- Meinzer, Oscar E. "Outline of Groundwater Hydrology", United States Geological Survey Water Supply Paper i+9^» 1923° ♦Merriam, Richard. "A Southern California Ring-Dike", American Journal of Science. Vol, 239, pp, 365-371, Fig. 2, 1:125,000. 19i^6. *Merriam, Richard. "Ground Water in the Bedrock in Western San Diego County, California". Department of Natural Resources, Division of Mines, Bulletin No. 159, pp. 117-128, pl, 7, 1951' *Merriam, Richard, "Geology of the Southern Portion of the Ramona Quadrangle and Northern Portion of the El Cajon Quadrangle, San Diego County", University of Southern California, Faculty Research. 19514- (a). *Merriam, Richard, "Geology of the Santa Ysabel Quadrangle, San Diego County". University of Southern California, Faculty Research. 195l+(b). Merrill, F. J. H, "Geology and Mineral Resources of San Diego and Imperial Counties, California". Mining Bureau, Report lU, pp. 636-722. 191^+, Miller, W. J. "Geologic Sections Across the Southern Peninsular Range". State of California, Department of Natural Resources, Division of Mines, Journal of Mines and Geology, Vol, 31, PP- 115-l'<-2, 1935(a), B-5'i- Miller, William J. "Geomorphology of the Southern Peninsular Range of California". Geological Society America Bulletin, Vol. U6, pp. 1535- 1562. 1935(b). Reed, R. D. and Hollister, J. S. "Structural Evolution of Southern California". American Association of Petroleum Geologist Bulletin, Vol. 20, No, 12, pp. 1529-1692. 1936. Ruxton, Bryon P. and Berry, Leonard. "Weathering of Granite and Associated Erosional Features in Hong Kong". Geologic Society of America Bulletin, Vol. 68, pp. 1263-1292. October, 1957 . Sauer, Carl Ortwin. "Land Forms in the Peninsular Range of California as Developed about Warners Hot Springs and Mesa Grande". University of California, Department of Geography Publication, Vol, 3, No, 4. I929. Shepard, F. P, "Geologic Mapping of the Ocean Bottom". Science Vol. 82, No. 2139, pp, 614-615. 1935, Shepard, F. P. "The California Sea Floor in Relation to Former Lowered Sea Levels". Proceedings of the Pacific Science Congress, Vol. 2, 1939, pp. 851-852. 19i^0, Shepard, F, P. and Emery, K. 0. "Submarine Topography Off the California Coast". Geological Society of America, Special Paper No. 3I, pp. I-I7I. 19^1, Shepard, Emery, Butcher, Gould. "Submarine Geology Off San Diego, California". Journal of Geology, Vol, 60, No. 6, 1952. Contribution No. 588 of Scripps Institute of Oceanography Contributions, pp. 511-51^7. 1952, Shepard, F. P. and Suess, H, E. "Rate of Post Glacial Rise of Sea Level". Science, Vol, 123, No. 3207, pp. 856-IO83, I956. Wenzel, L. K. "Methods for Determining Permeability of Water-Bearing Materials". United States Geological Survey Water Supply Paper 887. I9U2. * Reports used in the preparation of Plate 5, "Areal Geology", APPENDIX C RECORDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIBGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57 (C-1) APPENDIX C RECCRDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIBGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57 C-3 In Inches Season : Sutherland ; Pamo Dam : San Pasqual : Hodges and month : Dam : site : Valley : Dam 1936-37 October 1.06 5.70 I+.70 U.95 November 0.93 OoUO 0.i48 0.51 December 9.19 7.78 8.72 9,18 January- h.l3 3.99 2.93 3.08 February 12.59 8.98 8.26 8.69 March 6.3^ 6,50 U.90 5.16 April I.2I1 0.69 0.55 0.58 May 0.85 0.73 0.63 0,66 June July 0,20 0.19 0.11 0.12 August 0.08 T T September 0,08 T0TAI5 37.29^ 34,96^ 31.28^ 32.93 1937-38 October November 0.19 .09 0.10 December 2.59 1.90 2.00 2.11 January 2.67 1.66 1.27 1.3*4 February- 6.59 6.10 5.39 5.67 Mar eh 11.80 9.^40 6,61+ 6.99 April 1.65 0.92 0,82 0.86 May 0.89 o.in 0.32 0.3U June 0.06 0.10 0.11 July 0,10 T August OM T 0.02 0.03 September TOTALS 26.77^ 20, 61;^ 16.67^ 17.55 CA RECORDS OF MOOTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FCR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches Season and month Sutherland Dam Pamo Dam site San Pasqual Valley Hodges Dam 1938-39 October Nbvember December January February March April May June July August September TOTALS 1939„l+0 October November December January February March April May June July August September TOTALS 19ltO-l4-l October November December January February Msurch April May June July August September TOTAIS 0.75 0.08 0.10 0.08 8.09 6.58 1^.86 3'h6 3.86 2.55 If. 18 2.20 1.03 0.79 0.21 0.20 T 6.73 3.38 29.81* 20.65^ 19-. 32' 0.81 0.41 0.97 0.66 1.36 0.51+ 6.1+7 5.09 6.35 3'h7 0.61 0.30 1+.08 h.kl T T 0.12 17.06"^ 2,15 1.9*^ 1.52 0.70 10. OU 9.16 2.66 2.19 6.01 5.79 10.29 7.22 10.92 5.13 2.00 0.82 0.20 0.13 0.10 0.10 0.08 0.09 0.62 0.18 U.72 0.07 5.06 3.14 1.60 1.70 0.81 3.18 20.28'= 0.1+8 0.29 0.1+9 1+.56 1+.99 0.30 2.99 0.01+ 1+5.59* 33.45^ ll+.ll+° 1.11 0.36 5.33 1,81+ 1+.72 6.1+0 1+.96 0.76 o.iu 25.62<= 4.97 0.08 5.33 3.31 1068 1.79 0.85 0.05 3.35 21.1+1 0.51 0.29 0.52 1+.80 5.25 0.32 3.15 0.01+ 11+.88 1.17 0.38 5.60 1.94 1+.96 6.74 5.22 0.80 0,02 0.15 26.98 RECORDS OF MOMTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUTTO RIVIR WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches C-5 Season and month Sutherland Dam Pamo Dam site San Pasqual Valley Hodges Dam I9UI-U2 October November December January February March April May June July August September TOTALS k.ok 2.65 1.77 2.68 1^.01 5.10 1.58 0.76 3.73 3.38 2.81^ 1,81* 3.10 3.03 0.12 0.32 21.19^ 19.76^ 18.08C 19.03 1942-U3 October November December Janviary February March April May June July August September TOTALS 0.76 0.3^ 0.70 0.27 2.08 1.79 8.09 7.5*^ 2.88 2.00 k,k8 2.69 5.2IV 2.05 0.08 0.59 0,08 0.02 T 2l+.81+^ 16. 8U^ O.kk 0.2i* 1,88 6.88 I.5U 3.03 1.73 0,03 0.12 0.02 15.91' 16.75 191^3 „l+lf October November December January February March April May June July August September TOTALS 0.82 0.35 O.Oi* 0.03 6.11 8.01 2.55 1.70 9.70 U.78 2.67 1.61* 1.1*3 1.00 0.5** 0.1*1 0.28 0.56 T 21*. 11** I8.it8^ 15.39'' 0.26 0.03 7.76 i.oi* 1*.28 1.3^ 0,89 0.12 0.1*3 0.05 16.20 RECCRDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD I936-37 THROUGH I956-57 (continued) In Inches Season : Sutherland : Pamo Dam : San Pasqual : Hodges and month : Dam : site : Valley : Dam l^kk-k^ October 0.28 November 7.87 I+.78 5.06 5.33 December 2.01 1,1+5 1.39 1.1+6 January 0.69 0.29 0.06 0.06 February 3.76 2.1+8 2.35 2.1+7 March 6.85 5.1+0 I+.95 5.21 April 0,1+0 0.30 0.09 0.10 May 0.22 0.01+ June 0.29 0.15 0.08 0.08 July August 2.08 2.1+8 1.86 1.96 September 0.07 T 0.09 0.10 TOTALS 2l^.2l+a 17,65^ 15.93° 16.77 19U5_ll6 October T November 0.68 0.50 0.37 0.39 December 8,10 5.95 I+.71+ 1^.99 January 1.77 0.73 0.95 1.00 February 1,70 l.ltfi 1.00 1.06 March I+.IO 3.1+8 2.90 3.05 April 0.77 0.85 0.1+1+ 0.1+6 May 0.02 0.22 0.08 0.08 June July August September 0.11 TOTALS 17.25a 13.2113 10.1+8C 11,03 191+6-1^7 October 1,81+ 1.85 1.12 1.06 November I+.62 5.38 3.77 3.92 December 2.62 1.85 1.21 1.62 January 1.22 0.52 0.29 0.30 February 1.07 0.65 0.39 0.59 March 1.75 2. 91+ 2.77 2.53 April 1.06 0.52 0.68 0.1+2 May 0.10 0.05 0,09 June July August 0.20 September 0.32 0.10 0.11 0.07 TOTALS li+.8o^ 13.81^ 10.39 10.60 RECORDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FCR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches C-7 Season and month Sutherland Dam Pamo Dam site San Pasqual Valley Hodges Dam I947-U8 October November December January February March April May June July August September 0.72 0.73 ^.37 0.26 3.13 3.78 1.07 o.ou l.Ol* 0.65 0.62 2.36 0.03 1A9 2.35 0,85 0, 75 0.52 0.56 2.U9 0.03 1.56 2.12 0.59 0.45 TOTAIS 15. lU^ 9.10^ 8.32 9.09 191+8-1+9 October 2.07 1.31^ 1.19 0.91 November 0.05 December 5. 21+ 3.17 2.78 2.69 January IM 5.23 i+.89 h.srf February 3.97 2.11+ 1.90 1.96 March 2.1+7 1.75 1.10 1.56 April 0.16 0.15 0.53 0.02 May 1.50 i.oU 0.58 0.91 June July August T September TOTALS 22.87^ ll+.82^ 13.02 13.02 19^9-50 October 0.68 0.20 0.16 0.06 November 2.18 1.55 1.21 1.11 December 1.63 1.1^5 1.25 1.60 January 5.09 1+.32 3.22 I+.38 February 3.1i^ 1.72 1.52 1.88 March 2.29 1.1*0 1.29 1.08 April 0.85 0.1+2 0.1+0 0.1+3 May 0.87 0.21+ 0.21+ 0.09 June 0.0I+ 0.01 July 0.01 0.02 August September 0.22 O.II+ 0.03 0.05 TOTALS 16.99^ 11.1+613 9.32 10.70 RECORDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches Season : Sutherland : Pamn Dam : San Pasqual : Hodges and month : Dam : site : Valley : Dam 1950-51 October 0.01 November 2.28 1.85 1.71 2.11 December 0.18 0.03 0.01 0.10 Janueiry 4.12 3.39 2.85 3.05 Februsiry 2.U5 1.02 0.97 1.28 March 1.36 0.66 0.56 0.41 April 3.91 2.55 l.Ul 2.17 May 0.50 0.02 1.14 June July 0.29 0.08 August 2.17 0.73 0.80 0.64 September O.lU 0.24 0.11 0.18 TOTALS 17.11^ 10.79^ 9.56 10.02 1951-52 October 1.79 1.08 0.92 1.10 November 1.7^^ 1.73 1.46 1.01 December 8.29 7.02 1.78 5.85 January 7.23 6.10 8.60 6.25 February 2.37 0.23 0.19 1.22 March 8.12 6.05 6.46 4.84 April 3.02 1.90 1.83 2.01 May June 0.19 0.03 0.02 July T August September 0.19 0.10 0.05 TOTALS 32. 9h^ 2U.24^ 21.34 22.35 1952-53 October November U.59 3.37 2.13 2.37 December i+.21 3.15 2.50 2.74 January 2.38 1.75 2.27 1.46 February 1.95 0.80 0.64 1.01 March 2. 21+ 1-53 1.39 1.13 April 1.70 1.43 1.08 1.44 May 1.25 0.35 0.12 0.17 June 0.08 0.04 0.08 0.12 July August 0.03 September TOTALS 18. 40^ 12.42^ 10.24 10.44 RECORDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches C-9 Season and month Sutherland Dam Psuno Dam site San Pasqual Valley Hodges Dam 1953-5^ October November December Janueiry Februeury March April May Jxone July August September TOTALS 0.25^ 0.09 1.^5^ 1.30 0.56a 0.30 6.39a 5.02 2.15a 2.8U 8.63 5.35 O.i^O 0.28 0.05 0.10 0.21 0.16 0.60 0.08 20,17 15Ai+'= 0.18 1.16 0.22 i^.36 2.05 I+.8I o.oU 0.13 0.05 0.08 13.08 0.08 1.09 0.17 U.29 2.31 5oll 0.25 0.06 0.05 13.35 195^-55 October November December January Februsiry March April May June July August September TOTALS 0.99 1.02 l.u 1.13 7.17 4.52 2.61 IcOO 1.04 0.70 1.59 0.62 2.14 1.65 0.13 0.17 0.08 16.98 10.72' 0.01 1.01 0.64 3-49 O088 1.11 0.47 1.72 0.08 _0 9.41 0,98 0.89 4.47 1.32 0.65 1.48 1.43 0.02 11.24 1955-56 October November December January February March April May June July August September TOTALS 1.66 1.44 2.55 1.00 7.36 4.75 1,72 0.68 0.35 2.43 1.54 0.54 0.20 0.04 1. ,10 0. .82 3. ,21 Oc ,50 0. ,01 1. .18 0. .26 16,65 9.61' 7.08 1.37 0.69 4.21 0.44 0.02 1.44 0.24 _0 8.41 C-10 RECORDS OF MONTHLY PRECIPITATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FCR THE PERIOD 1936-37 THROUGH 1956-57 (continued) In Inches Season : Sutherland : Pamo Dam : San Pasqual : Hodges and month : Dam : site : Valley : Dam 1956-57 October 0.38 0.22 0.19 0.22 November NR December l.OU 0.62 0.58 0.58 January- 9.22 8,U8 6.67 7.68 February 1.55 0.65 0.62 0.82 March 1.79 1.56 l.lU 1.11 April 1.86 1.28 1.10 1.17 May 3.59 1.53 1.36 1.76 June 0.70 O.kQ O.itO 0.65 July August September TOTALS 18.37 li^.82^ 12.06 13.99 c. T m Estimated from measured values of precipitation at El Capitan Dam. Estimated from measured values of precipitation at U. S. Weather Bureau station at Escondido. Estimated from measured values of precipitation at Hodges Dam. Trace, an amount too small to measure. No record. APPENDIX D ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 19li+-15 THROUGH 1956-57 (D-1) D-3 APPENDIX D ESTIMATES OF MONTHLY RUNOFF FRCM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD I91I4-I5 THROUGH 1956-57 In Acre -Feet : : Between : Between Between :San Pasqual : Sutherland : Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland L: Pamo :San Pasqual : Dam and : Hodges ; Hodges and month Dam^ : Dam site : Dam sites^ : Hodges Dam*^ : Dam^ : Dam 191^-15 October 50 November 80 50 20 December 270 130 100 January 2,230 2,090 4,010 4,580 3,050 730 February- 8,660 5,740 8,800 l4,8oo 9,810 3,400 March 4,910 2,590 3,460 2,410 570 150 April 2,6U0 2,210 1,760 3,970 2,530 670 May 9,220 4,380 5,620 10,860 5,3^ 1,410 June 2,050 750 800 July 610 350 220 August 230 340 100 September 180 50 70 TOTALS 31,130 18,680 24,960 36,620 21,300 6,360 1915-16 October 130 40 80 November 220 i4o 170 December UUO 310 320 January 66, 400 37,600 87,870 189,970 145, 520 42,480 February 11,600 8,200 14, 660 13,160 4,960 1,450 March 7,810 3,390 7,920 8,440 5,050 1,500 April 4,090 1,970 3,640 2,570 600 200 May 2,l40 1,200 1,760 1,100 June 1,140 540 870 July 590 330 420 August 270 380 240 September 420 90 260 TOTALS 95,250 54,190 118,210 215,240 156,130 45,630 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 191^-15 THROUGH 1956-57 (continued) a In Acre-Feet 1 • : Between : Between • Between :San Pasqual : Sutherland: Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland: Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ :Hodges Dam^: Dam^ : Dam 1916-17 October 1(60 560 220 61+0 61+0 620 November 380 380 170 30 30 December 700 1,160 550 2,100 270 230 January 1,880 1,660 1,770 5,710 2,800 70 February- 3,1^60 3,760 2,1+20 i+,830 1,070 30 March 2,510 1,130 1,280 2,090 960 20 April 1,580 1,180 890 1,880 700 20 May 1,320 700 550 620 270 10 June 770 20 230 500 1+90 10 July 3^ 10 80 August 170 50 September 130 60 50 TOTALS 13,720 10,620 8,260 18,1+00 7,230 1,010 1917-18 October 70 80 50 November 160 liK) llK) December 130 180 120 January 220 520 260 21+0 21+0 200 February 350 550 360 March 3,990 3,820 6,600 17,100 11,1+30 6,1+10 April 990 250 770 520 J+1+0 3 1+0 May 7ko 1+50 30 20 10 June U20 210 July 100 60 August 100 50 September 90 50 TOTALS 7,360 5,5^^0 9,120 17,890 12,130 6,960 1918-19 October 130 ko 20 November 330 120 1+0 December 560 180 60 January 360 120 I4O February 930 30 170 March l,U4o 250 3I+O April 6ito 200 80 . May 310 130 30 June 60 10 July 10 August 10 September 30 TOTALS 1+,810 1,070 790 ESTIMATES OF MONTHLY RUNOFF ^CM SELECTED AREAS IN SAN DIEGUITO RIVEE WATERSHED FOR THE PERIOD 19l'+-15 THROUGH 1956-57 (continued) D-5 In Acre -Feet • • : Between : Between • • Between ;San Pasqual : Sutherland: Between : Between Pamo Dam : Dam site : Above : Dam and : Pamo and : Sutherland : site and : and Season ; Sutherland; Pamo :San Pasqual : Dam and : Hodges ; Hodges and month : Dam^ : Dam site : Dam sites^ : Hodges Dam^: Dam*^ : Dam 1919-20 October 60 10 10 November 260 30 10 10 December kho 1+0 30 30 Januairy 250 30 30 20 20 February 1,370 970 210 860 780 750 March 5,01+0 2,150 1,870 1,900 1*80 April 2,980 1,790 61+0 May 1,370 360 200 Jxme 380 170 60 July 90 10 10 August 250 20 September 30 TOTALS 12, 520 5,1180 3,110 2,830 1,330 750 1920-21 October 100 November 170 30 30 30 December 230 60 50 30 30 January 1+30 220 100 110 110 70 February 1+10 120 100 60 60 30 March 650 360 160 390 390 370 April 320 1+0 70 50 50 30 May 600 190 130 June 2lK) 50 July 20 August September TOTALS 3,170 990 690 670 670 500 1921-22 October 70 10 November 50 10 December ll,i+00 8,900 9,010 21,570 13,580 2,91+0 January 5,530 3,880 3,710 5,160 1,11*0 250 February 10,llO0 6,700 7,950 17,Ol40 7,1^70 1,620 March 9,2ao 6,020 6,950 15,030 7,550 1,630 April 5,370 3,730 3,560 5,230 1,500 320 May 2,91*0 2,190 1,650 1,660 June 1,310 670 51+0 July 500 320 190 180 180 180 August 210 80 60 September 100 50 30 180 180 180 TOTALS 1+7,160 32,51+0 33,670 66,050 31,600 7,120 D-6 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 19l'-i-15 THROUGH 1956-57 (continued) In Acre-Feet : Between : Between Between :San Pasqual : Sutherland : Between : Between : Pamn Dam : Dam site : Above : Dam and : Pamo and : Sutherland : site and : and Season •.Sutherland: Pamo :San Pasqual : Dam and ; Hodges : Hodges and month : Dama : Dam site : Dam sites^ : Hodges DamC; Damc ; Dam 1922-23 October 130 60 40 13b 30 30 November 320 160 110 180 50 40 December 1,380 680 670 980 260 230 January- 820 400 350 40 10 10 February 2,1+20 1,190 l,46o 2,340 630 550 March 1,650 810 850 1,350 360 320 April 1,610 790 820 580 160 140 May 720 360 310 40 10 10 June 330 160 120 120 30 30 July 90 50 40 150 40 40 August 50 30 20 130 30 30 September ko 20, 10 20 20 10 TOTALS 9,560 4,710^= 4,800 6,060 1,630 1,440 1923-24 October 70 50 40 November 120 70 90 30 30 December 230 l4o 160 60 60 20 January 260 160 180 70 70 30 February ll+O 80 100 70 70 40 March 860 520 600 1,030 980 960 April 790 480 600 320 290 270 May 230 130 160 90 90 8&' June 40 20 40 50 50 40 July 180 180 180 August 110 110 110 September TOTALS 2,740 1,650c 1,970 2,010 1,930 1,730 1924-25 October 10 November 70 30 30 December 610 220 250 180 180 140 January 320 120 110 50 50 10 February 260 90 100 60 60 30 March 390 140 160 50 50 30 April 1,100 400 540 210 210 190 May 360 130 160 40 40 30 June 340 120 140 July 10 August September TOTALS 3,470 1,250^ 1,490 590 590 430 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERICp 191^-15 THROUGH 1956-57 (continued) D-T In Acre-Feet • « : Between : Between • • Between :San Pasqual : Sutherland L: Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and . Season Sutherland L: Pamn :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ : Hodges Dam^: Dam^ : Dam 1925-26 October 160 100 60 November 180 110 60 December 200 120 80 January 170 100 60 February 1,190 710 1+20 180 120 90 March 400 21*0 150 April 11,310 6,790 8,760 16,160 8,910 2,1+00 May 1,290 770 1+70 June 360 220 120 July 70 I4O 30 August 10 10 September TOTALS 15, 3i^ 9,210^ 10,210 16,31+0 9,030 2,1+90 1926-27 October 20 20 10 November 110 80 50 December 2,070 1,530 1,630 January 870 61+0 530 February 30,800 22,730 36,860 9I+, 100 61+, 000 18,500 March 8,200 6,050 9,280 6,920 1,000 300 April 3,680 2,720 3,3^ l+,l+60 71+0 150 May 2,050 1,510 1,620 1,670 160 50 June I,l40 81+0 770 July 250 190 150 August 150 110 90 September 210' 160 120 TOTALS ^9,550 36,580^ 5^iv50 107,150 65,900 19,000 1927-28 October 180 120 130 November 210 130 150 1+0 1+0 30 December 570 3^ 520 30 20 10 January 510 300 U50 1,010 1+90 330 Febru€u:y 780 1+70 770 2,680 1,250 850 March 620 370 560 880 380 260 April J+00 2i+0 3»«0 20 20 10 May 280 170 170 60 80 60 June 70 ItO UO July August September TOTALS 3,620 2,l80C 3,130 l+,7^ 2,280 1,550 D-8 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 19li+-15 THROUGH 1956-57 (continued) In Acre-Feet m : Between : Between • • Between :San Pasqual : Sutherland L: Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland; Parao :San Pasqual : Dam and : Hodges : Hodges and month . Dam^ : Dam site t Dam sites^ : Hodges Dam^: DamC : Dam 1928-29 October November 200 130 160 December 190 110 150 250 100 20 January I13O 260 380 250 100 20 February- 800 i+80 600 830 330 50 Mar ch 1,080 6I4O 1,150 650 260 ko April 1,5^^0 920 1,720 1,050 1+20 70 May i^30 260 380 150 60 10 June 160 100 130 July 10 10 August September 50 20 20 TOTALS 1^,890 2,930= U,890 3,180 1,270 210 1929-30 October 10 November 30 10 10 December 30 10 10 10 10 January 1,020 620 780 U30 300 80 February 560 3^+0 Uoo 510 510 130 March 1.9^^0 1,160 1,590 l,i+20 290 70 April 1,030 620 800 1+60 120 30 May 2,650 1,600 2,330 i|,260 1,130 280 June 560 3i+0 390 July ll+O 90 90 August 30 20 20 September 10 TOTALS 8,010 U,8l0= 6,1+20 7,090 2,360 590 1930-31 October 60 ko 30 November 280 160 120 December 180 120 70 January 280 170 130 180 180 lUO February 1,390 830 770 900 i+30 330 March 350 210 150 April 280 170 130 120 May 250 150 100 130 120 June 20 10 July August September TOTALS 3,090 l,86o<: 1,500 1,330 730 1+70 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 19li^-15 THROUGH 1956-5? (continued) D-9 I n Acre -Feet • t Between ■ t : Between Between :San Pasqual : Sutherland : Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland L: Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ : Hodges Dam^: Dam^ : Dam 1931-32 October 10 10 November 100 50 30 December 1,350 720 580 3,250 3,120' 2,960 January ' 1,150 610 hGo 5^ i;30 390 February- 21,280 11,370 17,670 28,560 1U,070 500 March 3,980 2,130 2,i+90 6,060 3,930 200 April 1,600 860 730 930 90 May 980 520 390 710 710 June 550 290 210 110 110 July 200 110 60 August 50 30 20 September 30 20 TOTALS 31,280 16,720^ 22,6iK) uo,i6o 22,U60 U,050 1932-33 October 100 70 60 50 50 November 60 50 ko 10 10 December 350 260 2U0 l,2i40 1,2U0 350 January 2,000 l,i+8o 1,730 3,830 1,830 520 February 1,560 1,160 1,310 2,220 1+1+0 130 MSLTCh 880 650 670 April 700 520 530 U70 May 1,310 970 1,070 1,260 330 100 June U90 360 350 July 110 80 60 August 30 20 10 September 10 10 TOTAT.S 7,600 5,630^ 6,070 9,080 3,900 1,100 1933-3i+ October 10 10 November 30 20 10 10 10 December 200 120 100 390 390 350 January 310 180 130 250 250 210 February 250 150 110 k&o UQO 1+50 March 260 150 110 160 160 1140 April 120 70 50 May June July August September TOTALS 1,180 700'- 510 1,290 1,290 1,150 D-10 ESTIMATES OF MOKTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 191^^-15 THROUGH 1956-57 (contirraed) In Acre -Feet : Between : Between Between :San Pasqual : Sutherland : Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland : Pamo :San Pasqual : Dam and : Hodges : Hodges ~ and month Dam^ : Dam site : Dam sites^ :Hodges bam<^: DamC : Dam 193M5 October 220 220 200 November 70 60 30 250 250 ??0 December 290 230 130 750 750 710 January- 820 660 i+20 290 260 220 February 920 7U0 1+80 680 580 550 March 1,^400 1,120 850 April 760 610 1+00 May- 330 260 ll+O June 50 1+0 10 July August September TOTALS k,6kO 3,720^ 2,1+60 2,190 2,060 1,900 1935-36 October November 50 50 20 December 20 10 10 100 100 60 January 100 60 60 80 80 1+0 February 2,610 1,690 2,080 3,010 1,300 1,090 March 930 600 51+0 1+10 170 April 1,970 1,300 1,1+10 1,01+0 1+1+0 May 520 330 270 June 60 1+0 20 July 100 60 60 August 20 10 September 10 TOTALS 6,330 i+,110° i+,i+50 i+,690 2,11+0 1,210 1936-37 October 1,070 1,070 1,050 November 30 30 20 1+0 1+0 10 December 2,010 1,620 2,320 3,880 2,01+0 1,020 January 3,610 2,920 1+, 1+1+0 6,560 1,390 250 February 22,350 18,080 29,830 1+9,770 29,700 5,310 March 10,880 8,800 li+,86o 36,630 27,830 i+,950 April 5,010 l+,050 6,590 13,030 8,980 2,160 May 2,220 1,790 2,550 2,800 1,010 21+0 June 980 800 1,020 760 310 110 July 350 280 ll+O August 90 80 50 September 1+0 30 20 TOTALS 1+7, 570 38,1+80 61,81+0 lii+,5i+o 72,370 15,100 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 191^^-15 THROUGH 1956-57 (continued) D-11 In Acre -Feet • • : Between ; Between Between :San Pasqual ; Sutherland ; Between : Between : Pamo Dam t Dam site ; Above ; Dam and : Pamo and : Sutherland : site and : and Season : Sutherland: Pamo :San Pasqual : Dam and : Hodges : Hodges and month s Dam^ : Dam site : Dam sites^ s Hodges Dam^: Dam^ ; Dam 1937-38 ' October 50 I40 ItO November 80 70 ko 20 20 December 3^ 270 190 1+10 1+10 80 January k60 370 2itO 1,030 1,030 200 Februeiry 1,960 1,580 1,1+70 i+,550 2,280 1+60 March 20,310 16,330 25,850 50,21+0 33,220 6,530 April 3,190 2,560 2,890 3,280 720 1+50 May 1,920 1,5^0 1,1480 1,850 310 160 June 860 700 530 July 320 250 200 August 100 80 90 September ItO Uo 20 TOTALS 29,630 23,830c 33,Ol40 61,380 37,990 7,880 1938-39 October 90 100 60 November 130 160 90 December 860 1,020 930 3,230 1,590 330 January 1,070 1,260 1,360 3,950 2,190 1+50 February i|,010 1^,750 6,060 11,600 6,850 1,1+10 March 2,100 2,490 2,860 6,760 l+,270 880 April 1,1+90 1,760 1,900 2,880 1,120 230 May 710 830 81+0 June 210 250 100 July 50 60 20 August September 130 lltO 60 350 350 350 TOTALS 10,850 12,820^= llf,280 28,770 1^370 3,650 1939_lK) October 90 50 50 November 130 80 70 10 10 December 160 100 100 120 120 20 January 680 UlO 880 91+0 930 130 February 1,890 1,130 2,130 i+,oi+o 1,61+0 220 March 1,040 620 1,010 1,1+60 81+0 110 April 2,360 1,U20 2,680 3,980 2,560 350 May 500 300 1+30 ko 1+0 10 June 120 70 90 July 10 August September TOTALS 6,980 i+,i8oc 7,1+1+0 10,590 6,11+0 81+0 D-12 ESTIMATES OF MOOTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD I91U-I5 THROUGH 1956-57 (continued) In Acre -Feet : Between ; Between Between :San Pasqual : Sutherland : Btetween : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland : Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ J Hodges Dam^: DamC : Dam 19iK)-lH October 30 50 30 20 20 November 100 110 90 20 20 December 2,1+70 2,700 3,510 7,5^+0 ,5,520 1,570 January- 1,270 1,380 1,630 1+,210 2,150 610 February 3,910 l+,280 5,950 13,270 8,520 2,1+10 March 15,100 16, 520 2!+, 620 1+1,180 2i+,66o 7,000 April 13,830 15,lJ+0 22,380 1+2,130 26,990 7,650 May 3,760 1+,120 5,620 18,290 Ii+,170 U,020 June 1,420 1,560 1,850 8,890 7,330 2,080 July 590 650 670 August 3I+O 380 350 September 190 200 190 TOTALS 1+3,010 1+7,090° 66,890 135, 550 89,380 25,31+0 19iH-i^2 October 1+50 630 5I+0 1+00 November 1+70 630 570 2,280 800 250 December 960 1,320 1,320 9,030 7,710 2,200 January 1,770 2,1+30 2,61+0 7,130 i+,700 1,350 February 1,210 1,670 1,700 3,600 1,930 550 March 1,670 2,290 2,1+60 5,21+0 2,950 850 April 1,360 1,870 1,980 1,830 May 860 1,170 1,150 220 June 310 1+20 350 100 July 60 90 90 August September TOTAI£ 9,120 12,520° 12,800 29,830 18,170 5,200 I9I+2-I13 October 30 30 20 November 90 50 60 December 200 120 100 250 250 i+0 January 2,870 1,720 2,71+0 6,1+70 i+,760 850 February 1,880 1,130 1,630 2,520 750 lUO March 5,620 3,370 5,780 13, 9^^ 10, 570 1,920 April 5,080 3,050 5,220 l+,880 1,830 330 May 1,500 900 1,230 90 June 580 360 350 July ll+O 80 50 August 30 10 10 September TOTALS 18,020 10,820'^ 17,190 28,150 18,160 3,280 ESTIMATES OF MONTHLY RUNOFF FRCM SELECTED AREAS IN SAW DIEGUITO RIVER WATERSHED FOR THE PERIOD 191^-15 THROUGH 1956-57 (continued) D-13 In Acre -Feet • • : Between : Between ♦ Between :San Pasqual : Sutherland: Between : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland : Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ -.Hodges Dam<^: Dam^ : Dam 19k3-kk October ho 20 10 November 90 30 30 December kSO 220 170 630 180 1*0 January 500 2I+O 170 530 150 1+0 February 3,760 2,1+00 2,5^0 5,250 l,i+90 370 March h,690 2,280 3,3^+0 900 250 60 April 1,700 610 790 1,^70 lt20 100 May 960 310 370 210 60 20 June 560 280 210 180 50 10 July 110 90 50 August 10 10 September TOTALS 12,910 6,l^90 7,680 9,170 2,600 61+0 19^1^-1+5 October 10 November i^90 310 200 870 870 1+90 December 300 120 120 560 560 320 January 280 150 90 570 570 320 February 760 1+90 350 20 20 20 March 11,31+0 2,51+0 3,570 5,1+20 1,310 71*0 April 2,010 750 1,180 690 May 760 230 320 June 370 120 150 July 50 20 30 August 200 10 70 September 60 10 T0TAI5 9,620 If, 750 6,090 8,130 3,330 1,890 19U5_U6 October 60 1+0 November 110 20 50 December 3,380 1,900 l+,090 5,120 3,770 . 1,360 Jainuary 980 300 630 160 February 570 220 3^ 5UO 70 1+0 March 830 330 530 530 April 850 1+50 550 690 May 330 150 190 June 30 30 30 July August September 20 TOTALS 7,160 3,^+00 6,1+50 7,01+0 3,81+0 1,1+00 D-lU ESTIMATES OF MONTHLY RUNOFF FRQA SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 19llt-15 THROUGH 1956-57 (contlTiued) In Acre-Feet • : Between : Between : Between :San Pasqual : Sutherland: Between : Between : Pamo Dam : Dam site Above : Dam and : Parao and : Sutherland : site and : and Season Sutherland: Parao :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^ : Hodges Dam^: Dam*^ Dam 19^6-1^7 October kO November 7^ December 3^0 January 320 February 320 March kkO April 220 May kO June 10 July August September 290 220 160 120 230 180 30 10 610 290 270 290 270 120 ko 20 TOTALS 2,U90 1,230 1,920 191+7-^ October 10 November 10 30 December 130 10 90 January 70 30 40 February 2lt0 litO 110 March 3^0 120 150 April 3^ 60 90 May 50 40 30 June 20 10 10 July August September TOTALS 1,200 410 560 I9U8-U9 October 10 November 10 December 1»0 50 January 510 370 390 February 1,120 440 470 March 1,280 420 380 April 950 200 230 May 390 180 130 June 130 30 July August September 260 260 220 130 130 90 20 20 410 410 310 180 180 120 180 180 120 30 30 70 70 40 70 70 50 TOTALS 4,420 1,610 1,700 170 170 90 ESTIMATES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 191^^-15 THROUGH 1956-57 (continued) D-15 In Acre-Feet °. Between : Between Between :San Pasqual : Sutherland : Be-tween : Between : Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland : Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ : Dam site : Dam sites^* : Hodges Dara'^: DamC : Dam 1949.56 October November 10 December 60 50 January- 3i»0 150 160 50 50 February 560 350 230 10 10 March 3^ 110 110 April 200 110 80 May llK) ko 1+0 June 10 July August September TOTALS 1,650 760 680 60 60 1950-51 October November December 90 January- 170 90 100 February lUO 70 70 March 300 90 130 April 130 150 70 May 90 50 10 June July August September TOTALS 830 U50 1+70 1951-52 October November December 1,190 1,550 8U0 ll+O January 3,770 3,300 3,880 i+,570 2,0ltO February 990 390 270 March 10,010 i^,230 7,670 8,720 5,210 910 April 3,^90 920 l,U6o 1,780 1,360 180 May 1,390 670 i+10 220 190 June 650 170 160 July 120 30 August 10 September IK) ko ko TOTAIfi 21,620 11,230 1U,720 15,^^70 8,840 1,130 D-l6 ESTIMAOJES OF MONTHLY RUNOFF FROM SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 191*^-15 THROUGH 1956-57 (continued) In Acre -Feet : • • : Between : Between : Between :San Pasqual - : Sutherland L: Between : Between t Pamo Dam : Dam site Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland L: Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^ , : Dam site : Dam sites" : Hodges Dam*^ : Dam^ : Dam 1952-53 October November 80 110 December 2U0 160 210 1+0 30 January 1+70 530 320 30 20 February- 260 80 110 March 510 160 220 April 180 110 130 50 1«0 30 May 210 100 90 June ko 20 30 20 10 10 July August September 20 20 20 TOTALS 1,990 1,160 1,220 160 120 60 1953-5^ October 120 70 10 November 90 50 10 December 50 10 100 70 10 January 190 200 220 lltO 110 20 February 330 310 270 130 90 20 March 2,600 2,260 3,3^0 2,720 1+1+0 80 April 1,100 350 3I+O 150 90 20 May 300 100 70 70 10 10 June 80 10 30 80 20 10 July 10 80 20 10 August 70 10 10 September 3,230 l+,280 100 3,850 1+0 1,020 1+0 TOTALS 4,660'^ 250 195'+-55 October 100 50 1+0 November 10 90 50 30 December 30 10 70 1+0 10 January 200 1+0 150 80 50 20 February 130 1+0 80 March i4o 50 90 April ko 10 30 May 60 20 1+0 June July August September TOTALS 610^ 160 lK)0 3I+O 190 100 ESTIMATES OF MONTHLY RUNOFF FROA SELECTED AREAS IN SAN DIEGUITO RIVER WATERSHED FCR THE PERIOD 191^^-15 THROUGH 1956-57 (contiiraed) D-I7 In Acre -Feet • • • • : Between : Between • • • Between :San Pasqual : Sutherland: Between : Between : Pamo Dam : Dam site : Above : Dam and : Pamo and : Sutherland : site and : and Season Sutherland : Pamo :San Pasqual : Dam and : Hodges : Hodges and month Dam^i : Dam site : Dam sites^ : Hodge s Dam^: DamC : Dam 1955-56 October November December 20 10 10 10 January 350 550 870 110 30 February- 190 110 90 March 80 60 50 10 10 April 100 60 60 10 10 May IK) 10 30 June July August September TOTALS 780> ■P •rl :| O Ox! 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Plaintiffs, VSo THE CITY OF SAN DIEGO, a Municipal Corporation, Defendant I/O NOo 205,188 FINDINGS OF FACT AND CONCLUSIONS OF lAW The above entitled action coming on regularly for hearing the 20th day of August, 1957, before the Honorable Arthur L„ Mundo presiding and SWING, SCHARNIKOW & STANIFORTH by Phil ^o Swing and C„H„ Scharnikow appearing for Plaintiffs, and AARON Wo REESE and ALAN M„ FIRESTONE, Deputy City Attorneys appearing for the Defendant, and oral testimony and documentary evidence having been introduced on that day and on succeeding days to which said case was regularly continued and the taking of evidence having finally been completed on the lUth day of October, 1957, and said cause having been orally argued by respective counsel on the 17th, iBth and 21st of October, 1957, and written briefs filed, the case was submitted and the court being fully informed and advised in the premises, and having considered all matters in relation thereto, now makes its Findings of Fact and Conclusions of Law, as follows: FINDINGS OF FACT I. The Plaintiffs were and are, respectively^ the owners of the several G-7 parcels of land described and set out in the First Cause of Action of the' Complaint herein as belonging to therrij except that Plaintiffs Harold W, Pfeiffer and Helen Lo Pfeiffer on June 21, 19^6 conveyed their lands to Defendant THE CITY OF SAN DIEGO. Plaintiffs lands are situated in what is commonly known as the East San Pasqual Valley^, San Diego County, State of California o II San Dieguito Rivera known above its confluence with the Santa Maria Greek as Santa Isabel Creek,, has a watershed of 3U7 square miles o The river is also known as the San Bernardo Rivero It rises on the slope of Volcan Mountain at an elevation exceeding 5,0^00 feet and flows through a series of canyons and narrow valleys for some $3 miles ^ entering the Pacific Ocean a mile north of Del Maro Principal tributaries are Witch Creek ^ Black Canyon, Temescalj, Roden Canyon and Guejito Creek and Santa Maria Creek, all but the first and last named of which enter fron the north « There are two principal valleys through which the river flows, the San Pasqual Valley and the San Dieguito Valley, Sutherland Dam is located on the Santa Isabel Creek about 7 miles northeast of Ramona at Streambed elevation of about 1,900 feeto The river 5, together with the rainfall on the valley floor, supplies the water in the underground basin of these valleys o Except in the upper reaches, the surface flow of the river is not perennial but flows irregularly from negligible discharge in some summer seasons to occasional torrential floods during protracted winter stoiroso Through said East San Pasqual Valley the subsurface flow of said Creek percolates through the sands and gravels which underlie Plaintiffs' lands, and is the principal source of the underground waters found in that portion of the San Pasqual Basin over which Plaintiffs' said lands are located. G-8 IIIo As owners of said lands p each of said Plaintiffs is the owner of ripaxlan rights in and to the waters of the Santa Ysabel Creek and of overly:.lng rights In and to the underground waters of the San Pasqual Basin over which their said respective tracts of land liso Also the Plaintiffs (except the Cooks) each own a share of the appropriative rights in and to the waters of the Santa Ysabel Creek which were initiated in the year 18 76 and perfected and put to beneficial use by the predecessors in interest of said Plaintiffs long prior to the year 1913ji a-id have ever since been exercised J enjoyed and put to beneficial use by thera and by Plaintiffs on their said lands respectively owned by than, (except the Cooks) j to the fuIJL extent of their requirements 5 as and when the water was available in said stream at their diversion works at the head of the said San Pasqual Valley which said water they have taken and usedo In recent years plain- tiffs have not 5, by their said diversion works, ditch and pipe lines diverted, transported and used on their respective lands at any tirae^ quan- tities in excess of 12 cubic feet per second. The City of San Diego in 19$2 coininencsd building Sutherland Dam under its State peimit #79^42, issued to it June 20^ 1950s, and completed its construction J closing the downstream outlet on December 30, 1953 ^ and thereafter has stored and retained all water originating in the watershed above said dam, to wits 7,60li acre-feet from January 1, 19514 to June 30, 1957 of which ii,757 acre-feet was the inflow for the year 1953=-195Uj 733 acre-feet in 195U~1555s and 910 acre-feet was in 1955-1956, The appropriation of water by the City of San Diego in Sutherland Dam, and the subsequent dis- tribution and sale of a portion thereof was and is a public use. That since a-9 the ccanpletion of said dam there has been no surplus waters in said creek available to Defendant to store behind said dam^ but all of said water so stored by it was required by Plaintiffs to supply their reasonable needs and uses on their said lands o The withholding by the Defendant, The City of San Diego, of all the water of Santa Ysabel Creek originating above Sutherland Dam resulting in less of stream flow^ both in the quantities and in the extent of time and duration of the flow which otherwise would have reached San Pasqual Valley and Plaintiffs- said lands causing the water plane or water table beneath Plaintiffs' lands to fall below the root systems of their trees , orchard and alfalfa^ necessitating Plaintiffs having to irrigate their said trees, orchards and alfalfa more frequently than they otherwise would have had to do, thereby increasing their labor costs for irrigators and power costs for ptmiping irrigation water from their wells o That the water from their wells was of poorer quality than the surface flow of the Creek which they diverted at the head of the Valley and delivered to Plaintiffs' said lands for use thereon (except the lands of Plaintiffs Cook) in this, that the Creek flow was warmer and carried silt which fertilized their lands o Also the water plane or water table fell so low that Plaintiffs were unable to obtain their requirements from their respective wells without the ejqsenditure of substan- tial sums of money by them for new wells and new equipment o VIo The static water level in Plaintiffs' wells went down from ap- proximately 10 feet below the ground surface before the construction of Sutherland Dam to some i;!; feet after the dam was completedo In 1931, an G~i.O unusuallj dry year., the static water level went down to 20 feet. In 19^2, an unasixally wet. yearj, the level went up to 10 feet-, An average range of the static water level in Plaintiffs' walls before Sutherland Dam, was from 12 feet to 20 feet below the ground surface, which range of static water levels is required for Plaintiffs to farm their lands and operate their wells in the manner they were accustomed to do before Sutherland was put in operation, VII The court finds that Plaintiffs have used good judgment as farmers in handlfjig their several operations to obtain water and to produce their crops and there has been no unreasonable method of use or unreasonable method of diversion of water by Plaintiffs or any of them, nor has there been any waste of water by any of themo VIII. The Court finds that the losses incurred^ expenditures made and damages suffered by Plaintiffs as alleged and claimed by them„ were actually incurred., made and suffered by them but that only ^0% thereof were caused by and the direct and proximate result of Defendant City' s construc- tion and operation of Sutherland Dam and the withJiolding back of it of the waters of Santa Isabel Creek originating in the watershed above itj the other $0% the Court finds was the result of other causes p the principal one being the current severe and protracted drought « IX „ The Plaintiffs Stanley Trussell and Lucille M. Trussell in addition to being the owners in fee of the real property described in Sub- division (a) of Paragraph X of the Complaint were also, during the years 195ii, 1955 aJ^id 1956, the lessees and entitled to possession and in the G-n actual possession, occupation and use of that certain real property owned by the Plaintiff May Rhodes Trussell;, and described in Subdivision (c) of said Paragraph X„ Said Plaintiffs Stanley Trussell and Lucille M„ Trussell were also, during the years l^^U.n 1955 and 1956^ the lessees and entitled to possession and in actual possessionj occupation and use of the real property owned by Plaintiffs Erwin Go Georgeson and Lydia Co Georgeson described in Subdivision (j) of said Paragraph X as being in Section 35s Township 12 Souths Range 1 West, So B„ B„ & M, The Plaintiffs Stanley Trussell and Lucille M, Trussell were alsoj during the years 195U and 1955,9 the lessees of 10 acres of the real property owned by the Plaintiffs Rebecca Fo Judson Dyer, Fred Ao Dyer and Bemice J„ Judson Morrisey described in Subdivision (h) of Paragraph X, and for the year 1956 were the lessees of the entire 17 acres described in said Subdivision (h), and entitled to the possession and in actual possession, occupation and use of said property under their said leases » Plaintiffs Frank Eo Judson and Velda Co Judson in addition to being the owners in fee of ^he real property described in Subdivision (e) of Paragraph X of the Complaint , were also during the years 195Uj, 1955 and 1956 the lessees and entitled to the possession and actually in the possession, occupancy, and use of the real property owned by the Plaintiff Alice No Judson Suhrie described in Subdivision (f ) of said Paragraph X„ Applying the basic principles set out and adopted in the Finding VIII to the individual items of damages claimed and proven to have been suffered by the several Plaintiffs, the Court now finds that the Plaintiffs, respectively, incurred losses, made expenditures and suffered damages G=12 as the direct and proximate result of the Defendant's said acts, as follows % Ao Damages suffered by Stanley Trussell and Lucille M. Trussells 1„ By Plaintiffs Stanley Trussell and Lucille M, Trussell, as owners of the land described in Subdivision (a) of Paragraph X of the Complaints (a) For the year 195iis For increased power and labor costs » .. » o » $160.00 Decreased crop production oooooooooo 3$0oQ0 or a to'jal of ooooooooooo.oo $510 o 00 (b) For the year 1955^ § For increased power and labor costs , » « <, $ 2ii0.00 Decreased crop production » <, o » » » « o o 700 o 00 For additional water facilities 0,0000 796.00 or a total of o » . . » « o . o « . « . $1,736.00 (c) For the. year 1956s For ir.'cr eased power and labor costs ,0.0$ It20oOO Decreased crop production « o . . o o « o . 1,050.00 For additional water facilities . „ . o o . 2sl80.70 or a total ofo.ooo.ooooooo $3,650.70 2o By Plaintiffs Stanley Trussell and Lucille M„ Trussell as lessees of the land described in Subdivision (d) of Paragraph X of the Complaint as belonging to Plaintiff May Rhodes Trussell s (a) For the year ISSh' For increased power and labor costs o . . . . $20.00 Decreased crop production „ „ „ „ . . . . o o i;3o75 or a total of ..ooo.oooooooo $63 . 75 (b) For the year 19$$ % For increased power and labor costs 0.00.$ 30.00 Decreased crop production o . . . . . . . . . 87»50 or a total ofoooooo.oo.oo.o $117.50 G-13 (c) For the year 19$6i For increased power and labor costs ,0000$ 52,, ^0 Decreased crop production „ » o , , » » » o o 131o2$ or a total of 00000000000000 $183 o 75 3o By Plaintiffs Stanley Trussell and Lucille Mo Trussell as lessees of the land described in Subdivision (j) of Paragraph X of the Complaint as belonging to Plaintiffs Erwin Co Georgeson and Lydia Ao Georgesonj being 10 acres in Section 355. Township 12 So 5, Range 1 West, So Bo Bo & M„ (a) For the year 195Us For increased power and labor costs 00000$ UOoOO Decreased crop production 0000000000 87.50 or a total of 00000000000000 $127o50 (b) For the year 1955s For increased power and labor costs ,0.00$ 6O0OO Decreased crop production 0000000000 175°00 or a total of 00000000000000 $235oOO (c) For the year 1956? For increased power and labor costs ,0.00 $105oOO Decreased crop production 00000..000 262 o50 or a total of 00000000000000 $367o50 Uo By Plaintiffs Stanley Trussell and Lucille Mo Trussell j as lessees of the land described in Subdivision (h) of Paragraph X of the Com- plaint as belonging to Rebecca Po Judson Dyer, Fred Ao Dyer and Bernice Jo Judson Morrisey of which the Trussells had ten (10) acres under lease during the years 195U and 19555 ^^'^ "t^® entire seventeen (17) acres during the year 1956s (a) For the year 195Us For increased power and labor costs „ „ „ o o $ UOoOO Decreased crop production 0000000000 87»50 or a total ofoooooooooo»ooo $127 «50 G-lk (b) For the year 1955s For Increased power and labor costs 00000$ 6O0OO Decreased crop production .saea«a«a« 175oOO or a total of 00000000000000 $235 oOO (c) For the year 1956a For increased power and labor costs 00000 $178 o50 Decreased crop production 0000000000 UU6o25 or a total of 00000000 000000 $62i|.o75 Bo Damages suffered by Plaintiffs Franklin Trussell and Jane Lo Trussell s le By Franklin Tmssel-l and Jane L„ Trussellr, as owners of the land described in Subdivision (b) of Paragraph X of the Complaints (a) For the year 19$h- For increased power and labor costs „ o o o o $ hOoOO Decreased crop production 0000000000 87o50 or a total, of 00000000000000$ 127o50 (b) For the year 1955s For inereased power and labor costs o o o « o $ 6O0OO Decreased crop production ooo.oooooo 175oOO or a total of 00000000000000 $235 oOO (c) For the year 19562 For increased power and labor costs 0000$ 105oOO Decreased crop production 000000000 262,50 For additional water facilities 000000 1^2l|2a99 or a total of 0000000000000 $ls6lOoU9 Co Damages suffered by Plaintiff May Rhodes Trussell? lo This Plaintiff suffered no damages j, personally, she having been paid the land rentals due her by Plaintiffs Stanley Trussell and Lucille Mo Trussell who suffered the damages heretofore specified and set forth under their names » G-15 Do Damages suffered by Plaintiffs Frank E, Judson and Velda Co Judson: lo By Plaintiffs Frank Eo Judson and Velda Co Judson, as owners of land described in Subdivision (e) on Paragraph X of Complaints (a) For the year 195Us i For increased power and labor costs 00000$ 32«00 Decreased crop production 0000000000 7O0OO or a total ofoooooooooooooo $102 o 00 (b) For the year 1955? ^ ; For increased power and labor costs 00000$ U80OO Decreased crop production 0000000000 lljOoOO or a total ofoooooooooooooo $188 o 00 (c) For the year 1956s For increased power and labor costs 0000$ 8iioOO Decreased crop production 000000000 210 o 00 For additional water facilities 000000 2968606O or a total of 0000000000000 $2,980o60 2o By Plaintiffs Frank Eo Judson and Velda Co Judson, as lessees of the lands described in Subdivision (f ) of Paragraph X as belonging to Plaintiff Alice No Judson Suhries (a) For the year 195iiS For increased power and labor costs 00000 $220oOO Decreased crop production 0000000000 iLi.8lo25 or a total of 00000000000000 $701o25 (b) For the year 1955 s For increased power and labor costs 0.0.$ 330oOO Decreased crop production 00000000. 962 o50 For additional water facilities .,0.0. 8It6oOO or a total ofooooooooooooo $2,138o50 (c) For the year 1956s G=l6 For increased power and labor costs 0000$ 577o$0 Decreased crop production » o o o o o » o <, 1,UU3<.7$ or a total of 0000000000000 $2 ^ 021 o 25 E„ Damages suffered by Plaintiff Alice No Judson Suhries 1„ This Plaintiff suffered no damages personally, she having been paid the land rentals due her by Plaintiffs Frank E„ Judson and Velda C, Judson who suffered the damages heretofore specified and set forth under their names, Fo Dairiages s of fared by Charles Ae Judson and Rebecca To Judson: lo By Plaintiffs Charles A, Judson and Rebecca To Judson^ as owners of the land described in Subdivision (g) of Paragraph X of the Complaints (a) For the year 1954 s For increased power and labor costs 00000 $208,00 Decreased crop production o o » » » « <> « » » U$$oOO or a total of 00000000000000 $663 » 00 (b) For the year 195$s For increased power and labor costs 0000$ 312 oOO Decreased crop production « o o o « « o o , 9IO0OO For additional water facilities 000000 2392$oOO or a total of 000000000. o.o ^IijlUToOO (c) For the year 1956s For iTJcreased power and labor costs 0000$ 5ii6oOO Decreased crop production 000000000 1,365000 For additional water facilities 000000 I387U098 or a total ofooooooooooooo $3s785o9o Go Damages suffered by Plaintiffs Rebecca Judson Dyer, Bemice Jo Judson Morrisey and Fred Ao Dyer» lo These Plaintiffs as the owners of the land described in Subdivision (h) of Paragraph X cf the Complaint were actually occupying G-17 and farmings and suffered damages on only seven (7) acres having leased ten (10) acres to Plaintiffs Stanley Trussell and Lucille M, Trussello (a) For the year 195Us For increased power and labor costs „ » o « <> $28,00 Decreased crop production oooooooooo 61 » 2$ or a total ofo<,ooooooooooo<> $89o25 (b) For the year 19^$ i For increased power and labor costs o » <. » o $ l42»00 Decreased crop production oooooo«»oo 122»$0 or a total ofoooooooooooo*. $161|,50 (c) For the year 19$6s These Plaintiffs suffered no damages since the entire 17 acres was under lease to Plaintiffs Stanley Trussell and Lucille Mo Trussell for the year 1956, who suffered the damages heretofore specified and set out under their names » Ho Damages suffered by Plaintiffs Erwin Co Georgeson and Lydia Ao Georgeson o lo These Plaintiffs as the owners of the land described in Subdivision (j) of Paragraph X of the Complaint suffered damages thereon and thereto by way of expenditures made by them for additional water facilities « No damages were suffered by these Plaintiffs personally,, and none are allowed, for increased power and labor costs, or for decreased crop production since Plaintiff s - had their irrigated lands leased out to tenants (except the home site^ consisting of about one acre) which tenants paid Plaintiffs the land rent due themo (a) For the year 195Ui For additional water facilities o o » . o o $ 822.00 (b) For the year 1955s For additional water facilities » o o « » o $l,850oOO G"l8 (c) For the year 1956s no damages o To Damages siaffered by Plaintiffs Harold W,, Pfeiffer and Helen L„ Pfeiffer 2 1„ By Plaintiffs Harold W„ Pfeiffer and Helen L„ Pfeiffer as the owners of the land described in Subdivision (k) of Paragraph X of the Complaints (a) For the year 19$k' For increased power and labor costs » » o » « $131o00 Decreased crop production . o . o » o » o « . 253 » 75 or a total of « « o „ » o , « „ o » » « « $38Uo75 (b) For the year 1955 s For increased power and labor costs o o » » . $17UoOO Decreased crop production <, o » » <, « » » « » 507o50 or a total of „ » o » o <, » <> o » « o » <, $68lo50 (c) For the year 1956? These Plaintiffs conveyed their title to the prop- erty in question by a deed dated June 21, 1956 o which deed contained the following reservation? "Grantors reserve any and all causes of action which they now have, or which have arisen prior to delivery of this deed, against the City of San Diego for damages to the above- described property resulting,, or which will result from the cons traction J, operation., and maintenance of Sutherland Dam„" However, no claim was filed with the City for damages for the year 1956, and no allegation therefor was included jji Plaintiffs' Supplemental Complaint, and no damages are allowed for 1956 » Jo Damages suffered by the Plaintiffs Ralph Cook and Jeanne V„ Cooks lo These Plaintiffs acquired title to the land described in Subdivision (m) of Paragraph X of the Complaint, in May 1955., and suffered no damages for the year 195Uo G.19 (a) For the year 1955s For increased power and labor costs .... $ 117.00 Decreased crop production ..ooo.c.o 3Ul»50 For additional water facilities ...... 632.00 or a total ofo.o«.««oo.oo. 41,090.50 (b) For the year 1956? For increased power and labor costs ....<> $20Uo75 Decreased crop production oooo.oooo. 511 o8 7 or a total of osooo..so.oooa $716.62 Kp Damages suffered by Plaintiff Southeastern California Association of Seventh-Day Adventists, a corporations 1. This Plaintiff as the owner of the lands described in Subdivision (l) of Paragraph X of the Complaints (a) For the year 19$h' For increased power and labor costs «... $ liOO.OO Decreased crop production « <> . . . <> . . . 875»00 or a total of ao.o.o. ...... $1, 275.00 (b) For the year 1955s For increased power and labor costs . . . <. $ 600.00 Decreased crop production ....... .. 1,750.00 For additional water facilities , 2,38U»00 or a total of. ..oooo. ...... $U,73UoOO (c) For the year 1956s For increased power and labor costs . . . . $1,050.00 Decreased crop production ......... 2,625.00 For additional water facilities ...... Us66l«29 or a total of.ooo.ooooo.oo $8,336.29 Ho The Court finds that it is true that Plaintiffs, at the time they filed their claim against The City of San Diego, and at the time they filed their Complaint herein^, had no actual notice or knowledge of the City' s plans 0»20 and intentions or what its policy wou^Ld bs with reference to limiting its storage of Santa Isabel Creek water back of Sutherland Dam^ solely to the excess and surplus over and above the Plaintiffs' reasonable requirements, and for that reason they filed a second cause of action to their Complaint alleging permanent damages. However j, Defendant City in its Answer denied that it had appropriated to its own use^ profit and enjoyment all the waters of Santa Isabel Creek originating above said Dam and denied any permanent injury or damage to Plaintiffs or their respective lands. There was no evidence introduced by either party on the subject of permanent damages but the case was tried on the theory that permanent damages were not an issue before the courto Accordingly, no finding is necessary on the Second Cause of Action set out in Plaintiffs' Complaintj and none will be made, XII, The Court finds that the Defendant, The City of San Diego, will, unless restrained,, continue in the f atiire its current policy and practice of withholding behind Sutherland Dam to the extent of its capacity, all the water of the Santa Isabel Creek originating above the dam for distribution and sale of that water for municipal purposes^ to the continuing injury and damage of the Plaintiffs and each of them and their respective lands. XIII o The Defendants The City of San Diego, stipulated with the Plain- tiffs that the rights of the Parties herein should be and remain as they were on January 30, 195U. There was no diversion from the Sutherland Reservoir out of the watershed and into the City' s distribution system until about March 26, 19$Us 'when water from Sutherland Dam was, for the first time, diverted through a tunnel into the San Vicente Reservoir of The City of San G-21 Diego in order tc test the newly constructed Sutherland tunnel and diversion works o This test continued into April 19$h<, and constituted the major part of the total U, 322 06 acre-feet withdrawn from that reservoir o Thereafter there were no other diversions from Sutherland Dam that year„ The next diversions occurred one each in the years 1955 and 1956 and were of relatively small amounts of water o From the foregoing facts, the Court concludes: CONCLUSIONS OF lAW lo That Plaintiffs J as the owners of lands described and set out in the Complaintj were and each of them now arej except Plaintiffs Harold W„ Pf eiffer and Helen Lo Pf eiffer, the owners of rights in and to the waters of the Santa Ysabel Creek prior and paramount to the appropriative rights of the Defendant p The City of San Diego <, II o That the Plaintiffs were_c and each of them now are^, except Plaintiffs Harold ¥„ Pfeiff er and Helen L,, Pfeiffer^ as the owner of said prior and paramount rights j entitled to have sufficient amounts of the flow of the Santa Ysabel Creekj surface and subsurface, come down to them to meet their reasonable requirements for beneficial use on their said respective lands, without interference or interruption by the Defendanto However, none of said Plaintiffs are entitled to transport or to use any of the waters of said creek outside its watershed „ IIIo That the Plaintiffs in order to meet their reasonable requirements 0-22 were net ar,,d are not obliged to chsnge their long established methods of diversion arA use of ^he watars of the Sajita Isabel Creek^, which this Court has fo-urd were reasonable^ and are entitled to have the normal static water table cr water level under their respective lands j, on which they are dependent for their well water,, be and remain as it woiald have been if Sutherland Dam had not been bii;iilt 'by the DefendaD.T^o The Plaintiffs are entitled to have such normal static water level uaader their said lands and in their said wells, range between 12 feet and 20 feet below the ground surface. Defendant is not entitled to Twlthtioid or store any of the natural flow of Santa Isabel Creek upstream from Plaintiffs' said lands when the average static water level under Plaintiffs' said lands and in their wells falls 20 feet below the surrounding ground surface^ and Defendant is enjoined and restrained from so doing o TV. That the normal static water level under Plaintiffs' lands could and would be determined and established by the average of the static water levels in Plaintiffs' several wells, but the parties to this action may agree to designate certain wells as representative of the general area involved for that purposeo The static water level in the wells should be measured and recorded monthly and a copy of the report of the static water levels should be filed with the Court in this c-ase and copies delivered to each of the parties to this action or to their designated representatives » If the parties are un- able to agree upon the wells which are to be measured and read for deteniiining the static water level and the procediare to be followed in connection therewith, an application may be made to this Court by any party to the action for a hearing to determine and designate the number and the location of the test wells and the procediire to be followed for measuring and determining the static G-23 water level., and after notice and hearingj the Court shall so decide and determine o V„ That the Plaintiffs are, respectively ;, entitled to receive from and be paid by Defendant The City of San Diego 5 damages in the amounts specified and set forth in Finding Noo Xj which are here summarized and totaled as follows s Ao To Plaintiffs STANLEY TRUSSELL and LUCILLE M» TRUSSELL damages in the sum of SEVEN THOUSAND NINE HUNDRED SEVENTY-EIGHT AND 95/100 ($7,978o95) DOLLARSo B„ To Plaintiffs FRANKLIN TRTJSSELL and JANE L„ TRUSSELL damages in the sum of ONE THOUSAND NINE HUNDRED SEVENTY-TWO AND 99/100 (|1, 972.99) DOLLARS, Co To Plaintiff MY RHODES TRUSSELL, No Damages, Do To Plaintiffs FRANK E, JUDSON and VELDA C, JUDSON damages in the sum of EIGHT THOUSAND ONE HUNDRED THIRTY-ONE AND 6O/IOO ($8, 131.60) DOLlARSo Eo To Plaintiff ALICE No JUDSON SUHRIE, No Damages, Fo To Plaintiffs CHARLES A, JUDSON and REBECCA T. JUDSON damages in the sum of EIGHT THOUSAND FIVE HUNDRED NINETY-FIVE AND 98/IOO ($8, 595 « 98) DOLIARS, Go To Plaintiffs REBECCA JUDSON DYER, BERNICE J. JUDSON MORRISEY and FRED Ao DYER^ damages in the sum of TWO HUNDRED FIFTY-THREE AND 75/100 ($253,75) DOLLARS, Ho To Plaintiffs ERWIN C, GEORGESON and LYDIA A, GEORGESON damages in the sum of TWO THOUSAND SIX HUNDRED SEVENTY-TWO AND NO/lOO ($2,672,00) DOLLARS , G-21-^ I. To Plaintiffs HAROLD W, PFEIFFER and HELEN Lo PFEIFFER damages ±a %he sum of ONE THOUSAND SHT[~SU. AND 2;;/100 ($l,066o25) DOLLARS „ Jo To Plaiptiffs RALPH COOK and JEANNE V. COOK, damages in the sum of ONE THOUSAND EIGHT HUNDRED SEVEN AND 12/100 ($1,80?„12) DOLLARS, Ko To Plaintiffs SOUTHEASTERN CALIFORI\fIA ASSOCIATION OF SEVENTH-DAY ADVENTISTSp a corporations damages ±n the sum of FOURTEEN THOUSAND THREE HUNDRED FORTI-FIVE AND 29/100 ($m,3U5o29) DOLIARS. 'vi„ That the Plaintiffs are entitled oo have this Court exercise its eqixitable powers to proteox their rights against the threatened continuing invasion thereof by Def endantj, since there has been no such public use made of any of the waters stored in or diverted out of Sutherland Reservoir to an extent sufficient to deter this Court from granting appropriate injunctive relief I furthermorej even if some public use had been made of some of the said vaters. Defendant would not be and is not entitled to assert a claim of public use because of the stipulation found in Finding No. XIII to have been made by it with the Plaintiffs, wherein the rights of these parties were fixed as of January 30, 19!5l4o VII, The Court should and does hereby reserve jurisdiction in this action to grant appropriate relief to- any party thereto or to their suc- cessors in interest upon application duly made therefor, notice thereof and upon a proper evidentiary showing of merit » VIII „ That the Plaintiffs are entitled to recover their costs incurred herein™ G-25 LET JUDGMENT BE ENTERED ACCORDINGLY » Dated this 17 day of Decembers 1957c /s/ Arthur L, Mundo JUDGE OF THE SUPERIOR COURT G^26 JUDGMENT IN THE SUPERIOR COURT OF THE STATE OF CALIFORNIA IN AND FOR THE COUNTY OF SAN DIEGO STANLEY TRUSSELL„ et al,, ) Plaintiff S5 ) vs< > / THE CITY OF SAN DIEGO J a ) M\in: Lcipal C<. .i-poratioriT ) Defsridauto ) NOo 20$,U88 JUDGMENT The above entitled action coming on regularly for hearing the 20th day of Augustp 1957.9 before the Honorable Arthur L, Mundo presiding, and SWING J, SCHAKNIKOW & STANIFORTH by Phil D„ Swing and C„ H. Schamikow appearing for Plaintiff s^ aod AARON ¥0 REESE and ALAN M„ FIRESTONE, Deputy City Attorneys appearing for the Def endantc, and oral testimony and documentary evidence ha-ring been introduced on that day and on succeeding days to which said case was regularly continued and the taking of evidence having finally been completed on the llith day of October,, 19579 and said cause having been orally argued by respective counsel on the 17thj, l8thj, and 21st of October, 195? 5, and written briefs filed j the case was submitted and the court being fully informed and advised in the premises ;, and after due deliberation thereon, having filed its Findings of Fact and Conclusions of Law, and having directed that judgment be entered in accordance therewith^ now therefore by reason of the law and the findings aforesaid? IT IS HEREBY ORDERED ^ ADJUDGED AND DECREED? io That Plaintiffs^ as the owr).ers of lands described and set out G-27 in the First Cause of Action of the Complaint, were and each of them now arej except Plaintiffs Harold W„ Pfeiffer and Helen Lo Pfeiffer, the owners of rights in and to the waters of the Santa Isabel Creek prior and paramount to the appropriative rights of the Defendant,-, The City of San Diego « 2o That the Plaintiffs were^ and each of them now are 5 except Plaintiffs Harold W„ Pfeiffer and Helen Lo Pfeiffer, as the owner of said prior and paramount rights, entitled to have sufficient amounts of the flow of the Santa Isabel Greeks surface and subsurface, come down to them to meet their reasonable requirements for beneficial use on their said respective lands J without interference or interruption t^ the Defendants However, none of said Plaintiffs are entitled to transport or to use any of the waters of said Creek outside its watersheds 3o That the Plaintiffs, in order to meet their reasonable require- ments were not and are not obliged to change their long established methods of diversion and use of the waters of the Santa Isabel Creek, which this Court has found were reasonable, and are entitled to have the normal static water table or water level under their respective lands, on which they are dependent for their well water, be and remain as it would have been if Sutherland Dam had not been built by the Defendant o The Plaintiffs are entitled to have such normal static water level under their said lands and in their said wells, range between 12 feet and 20 feet below the groimd sur- face » Defendant is not entitled to withhold or store any of the natviral flow of Santa Isabel Creek upstream from Plaintiffs' said lands when the average static water level under Plaintiffs' said lands and in their wells falls 20 feet below the surrounding ground surface, and Defendant by its operation of Sutherland Dam has violated and invaded the rights of Plaintiffs to their damage by withholding all of the waters of said Creek originating above said Dam in the amount hereinafter set forth. G-28 ko That the damages caused the several Plaintiffs by Defendant The City of San Diego invading their rights by its operation of Sutherland Danij and the withholding of all water originating above said Dam^ are the amo\mts specified and set out below opposite the names of the respective Plaintiffs which Defendant is ordered zo pays A„ To Plaintiffs STANLEY TRUSSELL and LUCILLE Mo TRUSSELL damages in the sum of SEVEN THOUSAND NINE HUNDRED SEVENTY- EIGHT AND 95/100 ($7o978„95) DOLIARS, 3, To Plaintiffa FRANKLIN TRUSSELL and JANE Lo TRUSSELL damages in the sum of ONE THOUSAND NINE HUNDRED SEVENTY=TWO AND 99/100 ($1,972. 9>) DOLLARS, C. To Plaintiff MAY RHODES TRUSSELL, Nc Damages » D. To Plaintiffs FRANK E„ JUDSON and VELDA C. JUDSON damages in the sum of EIGHT THOUSAND ONE HUNDRED THIRTY-ONE AND 60/1C0 ($8 J, 131.60) DOLLARS. E. To Plaintiff ALICE N„ JUDSON SUHRIEj No Damages. F. To Plaintiffs CHARLES A. JUDSON and REBECCA T„ JUDSON d^amages in the sw of EIGHT THOUSAND FIVE HUNDRED NINETY- FIVE AND 98/100 ( $8 J, 595 o 98) DOLLARS. G. To Plaintiffs REBECCA JUDSON DYER^ BERNlCE J. JUDSON MORRISEY, and FRED A. DYER damages in the sum of TWO HUNDRED FIFTY=.THREE AND 75/100 ($253.75) DOLLARS. H. To Plaintiffs ERWIN C. GEORGESON and LYDIA A, GBORGESON damages in the sum of TWO THOUSAND SIX HUNDRED SEVENTY-TWO AND NO/100 ($2,672.00) DOLLARS, I, To Plaintiffs HAROLD W„ PFEIFFER and HELEN L„ PFEIFFER damages in the sum of ONE THOUSAND SIXTY-SIX AND 25/100 ($1,066.25) DOUARSc G-29 Jo To Plaintiffs RALPH COOK and JEANNE V. COOK, damages in the s-um of ONE THOUSAND EIGHT HUNDRED SEVEN AND 12/100 ($1,807.12) DOLLARS, K„ To Plaintiffs SOUTHEASTERN CALIFORNIA ASSOCIATION OF SEVENTH~DAY ADVENTISTS, a corporation j damages in the sum of FOURTEEN THOUSAND THREE HUNDRED FORTY-FIVE AND 29/100 ($lU,3ii^o29) DOLIARSo 5. That the normal static water level iinder Plaintiffs' lands is to be determined and established by the average of the static water levels in Plaintiffs' several wells ^ but the parties to this action may agree to desig- nate certain wells, as representative of the general area involved for that purpose. The static water level in the wells should be measiired and recorded monthly by the Plaintiffs and a copy of the report of the static water levels shoiild be filed with the Court in this case and copies delivered to each of the parties to this action or to their designated representatives. If the parties are unable to agree upon the wells which are to be measured and read for determining the static water level and the procedure to be followed in connection therewithn an application may be made to this Court by any party to the action for a hearing to determine and designate the number and the location if the test wells and the procedure to be followed for measuring and determining the static water level, and after due notice and hearing, the Court shall so decide and determineo 60 The Plaintiffs are entitled to have this Court exercise its equitable powers to protect their rights against the threatened continuing invasion thereof by Defendant,, since there has been no such public use made of any of the waters stored in or diverted out of Sutherland Reservoir to an G-=30 extent sufficient to dete?.' this Court from granting appropriative injunctive relief I furthermore. Defendant is not entitled to assert a claim of public use because of the stipulation found in Finding No. XIII to have been made by it with the Plaintiffs, wherein the rights of these parties were fixed as of January 30? 195^° Accordingly, it is ordered, adjudged and decreed that the Defendant, The City of Sar, Diego, their agents, servants and employees, and all persons acting by, through or under them, be and they are hereby enjoined and restrained from storing or withholding any of the natural flow of Santa Isabel Creek upstream from Plaintiffs • said lands whenever the static water level under Plaintiffs ' said lands and in their said wells falls, and is 20 feet or more below the surrounding ground surface. 7- The Court hereby reserves jurisdiction in this action to grant appropriate relief to any party thereto or to their successors in interest upon application duly made therefor, and after due notice thereof and upon a proper evidentiary showing of merit. 8, Plaintiffs are entitled to recover their costs incurred herein. DATED s December 17, 1957. JUDGE OF THE SUPERICR COURT APPENDIX H LAUD USE, LAND CLASSIFICATION, AND CONSUMPTIVE USE OF WATER IN SAN DIEGUITO RIVER WATERSHED (H-1) TABLE OF CONTENTS LAND USE, LMJD CLASSIFICATION, AND CONSUMPTIVE USE OF WATER IN SAN DIEGUITO RIVER WATERSHED Page Land Use in Hydrologic Units and Subiinits of San Dieguito River Watershed for 1956-57 ...... H- 3 H-2 Standards for Classification of Lands for Water Service „, ....o ........... . H- 5 H-3 Classification of Lands in Hydrologic Units and Subunits of San Dieguito River Watershed .... H- 8 H-4 Probable Ultimate Pattern of Land Use in Hydrologic Units and Subiinits of San Dieguito River Watershed ....... 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p «:< U •> m CI o -o o •H 01 P » n 1 H ca "O § M ■P ■P a> H to o n o S •H o Q> Q) X u (4 M en cd s 0) o tJ s« o Q aa E-i CO 5 o 3 TABLE H-5 H-11 ESTIMATED MEAN SEASONAL UNIT VALUES OF CONSUMPTIVE USE OF WATER IN HYDROLOGIC UNITS OF SAN DIEGUITO RIVER WATERSHED In Feet Inland Unit Central Unit : Coastal Unit :Preci-i :Preci- rPreci- Class and type of Applied: pita- : Total Applied :pita- : Total : Applied :pita- : Total land use water :tion : water :tion ! water :tion URBAN AND SUBURBAN LANDS Residential 1.2 1.0 2,2 1.3 0,9 2.2 1.3 0.9 2.2 Miscellaneous urban and suburban 1.2 1.0 2.2 1,3 0.9 2,2 1.3 0,9 2.2 Commercial 0.5 0,5 1,0 0.5 0.5 1.0 0,5 0.5 1.0 Industrial 1.5 0,6 2.1 1.5 0.6 2,1 1.5 0.6 2.1 Parks and cemeteries 0.5 0.6 1.1 0,5 0.6 1.1 0.5 0,6 1.1 Vacant 0.6 0.6 0.6 0,6 0.5 0.5 Streets and roads 0.5 0.5 0.5 0,5 0.5 0.5 IRRIGATED LANDS Alfalfa and pasture 2.3 1.2 3.5 2.5 1.1 3.6 2,3 1.0 3.3 Avocados 1.5 1.0 2.5 1.6 0,9 2.5 1.5 0.9 2.4 Beans 0.8 0.8 1.6 1.2 0.8 3.0 0.8 0.8 1.6 Citrus 1.3 1.0 2,3 1,4 0.9 2.3 1.3 0.9 2.2 Deciduous and vineyard 1.4 1.2 2.6 1,6 1.2 2.8 1.6 1.0 2.6 Hay and grain 0.5 1.0 1.5 0.6 0.9 1.5 0.6 0,8 1.4 Truck crops 1.1 0.9 2.0 1.3 0.8 2.1 1.2 0,8 2,0 NONIRRIGATED LANDS Field crops 1.0 1.0 Pasture and grain 1.6 1.6 1.2 1.2 1.0 1,0 Orchard amd vineyard 1.8 1.8 1.3 1.3 1,0 1,0 Idle and fallow 0.8 0.8 0.6 0,6 0.5 0,5 Miscellaneous 1.6 1.6 1.2 1,2 1.0 1.0 NATIVE VEGETATION Light brush and grass lands 1.6 1,6 1.2 1.2 1.0 1.0 Medium brush 1.8 1.8 1.3 1.3 1.1 1.1 Heavy brush and trees 2.0 2.0 1.4 1.4 1,1 1.1 Phreatophytes 4.7 4.7 4.7 4.7 4.5 4.5 Water surfaces 4.3 4.3 4.2 4.2 4.1 4.1 Barren and waste 0.8 0«8 0.6 0.6 0,6 0,6 APPENDIX I ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIBGUITO RIVER WATERSHED F(B THE PERIOD 1936-37 THROUGH 1956-57 (l-l) APPEIDIX I ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIHJUITO RIVER WATERSHED FOR THE PERIOD 1936-3? THROUGH 1956=.57^ In Inches Season and month t Pamo Sutherland s Reservoir Reservoir : site^ San Pasqual Reservoir sits Hodges Reservoir 1936-37 October 3e27 3o6o 1.69 1.59 November 3 = 66 UoOT 3»68 3M December 3.29 3.63 2.3^^ 2.21 January 1 = 91 l.8i^ 1.9^ 1.83 February 3«06 3 03 3.99 3.76 March 2o8U 3-01^ 2„89 2.73 April k.26 U„89 4ol2 3.89 May ^"37 5«03 6o33 5o97 June 5o59 6.61 7olO 6.70 July 6,19 7^38 7o31 6.90 August 5o8i 6.89 7.60 7«17 September 5o8li 60 93 6»32 5.96 TOTAT.S 50„09c 57o24 55«31^ 52.18 1937-38 October ^«75 5 = 51 4.66 k.ko November 3»27 3o60 2o49 2 = 35 December 2,96 3.20 2o26 2.13 January 3.05 3o31 2,00 1.89 February 2.19 2.21 1.1+4 1.36 March 2o56 2»68 3M 3o24 April 3-91 kA3 4.80 ^.53 May h,k3 5.1i^ 5.57 5.25 June 5.68 6,72 6M 6.10 July 6.35 7.59 7.70 7.26 August 5.87 6.96 7.31 6.90 September 6.16 l'3h 6.87 6A3 TOTALS 51.20^ 58069 55«00° 51.89 ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIBGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956=57^ (continued) In Inches Season and month Sutherland Reservoir Pamo Reservoir site^ San Pasqual Reservoir site Hodges Reservoir 1238-39 October i^.55 5.26 k.2k if, 00 November k.2k if. 85 3.92 3.70 December 2.69 2,8if 2.16 2.04 January 2.21 2.23 1,69 1,59 February- 2AI 2,50 2.3i+ 2,21 March 2.61 2,75 2.09 1.97 April 3.93 k.h-j 3.22 3,0if May 5.31+ 6.29 6,07 5.73 June 6.32 7.55 8.00 7.55 July 6,70 8.0if 8.32 7.8if August 6.2k l'h3 7.i+l 6,99 September ^.33 h,91 If. 97 if, 69 TOTALS 51.57'' 59.20 ^k.k3^ 51.35 1939_Uo October ^.57 5.28 if .61 1^.35 November 3.23 3.55 2,7^^ 2.59 December 2.88 3«io 2,07 1.95 Janiwry 2.02 1.98 1.53 l.ifif February 2,13 2.13 2.23 2.10 March 3.55 3.97 3.16 2.98 April 3.75 i+,22 if. 25 if. 01 May 5.60 6,62 6.38 6,02 June 5-73 6,79 6,82 6.if3 July 7.27 8.78 8.61 8,12 August 6.16 7.3^ 8.02 7.58 September 5.13 6,01 5.12 if.83 TOTALS 52, 02^^ 59.78 55.5ii^ 52,itO 19lK).2n October if. 85 5.65 if. 05 3,82 November 3.h6 3.85 3.05 2.88 December 2.75 2,93 3.55 3.35 January 1,81 1,70 if, 30 if.o6 February 2,09 2.07 1,12 1.06 March 2.85 3.05 2.88 2.72 April 2.85 3-06 3'kk 3,2if May h.l3 5.i+9 k.n if. 50 June 5.58 6,59 6,ifif 6.07 July 6,3^^ 7,58 7.2if 6,83 August 6.12 7.30 6, if 3 6.07 September 5.^5 6,i+3 5.10 if.8l TOTAIS it8,88' 55.70 52.37 if 9. if 1 ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIEGUITO RF/ER WATERSHED FCR THE PERIOD 1936-37 THROUGH 1956- 57^ (contiiQ'ued) In Inches : Pamo :3an Pasqual Season : Sutherland : Reservoir ; Reservoir : Hodges and month : Reservoir site^ : site ; Reser-voir I9IH-42 October U.30 4.93 3.68 3.47 November 3.69 k.lk 3.03 2.86 December 2,46 2.55 1.38 1.30 January 2.6k 2.78 1.68 1.59 February 2.63 2o76 1.91 1.80 March 6.78 5.79 2.98 2.81 April 3.25 3-57 2.99 2.82 May 5o35 6.30 5.^7 5.16 June 5.98 7.12 6.39 6,03 July 6.98 8.U1 8.13 7.67 August 6.61 7.93 6.03 5.69 September 5»9T 7.10 k.kl 4.16 TOTAIS 56.62° 63.38 J48.08^ 45.36 I9J+2-U3 October 5.00 5.81^ 3.77 3.56 November i+.Ol 1^.56 2.k8 2.34 December 3.16 3.i+6 1.99 1.88 January 2 080 3.00 2.33 2.20 February 2.62 2.75 2.26 2.13 March 2.70 2.87 2»U9 2.35 April 3.U8 3.87 3.03 2.86 May 5-73 6.79 h.-jh 4.47 June 6.26 7.1*8 5.78 5.^+5 July 6.77 8.13 6.1+8 6.11 August 6.30 7.53 5.75 5.42 September 6,08 7.25 I1.86 4.59 TOTALS 51^.91^ 63.53 45.96'^ 1+3.36 I9U3-H October 1+.75 5.22 3.83 3.61 November U.81 4.27 3.77 3.56 December 2.31 2.19 2.04 1.92 January 2.6U 2.73 1.98 1.87 February 1.99 2.16 2.08 1.96 March 3.67 4.03 3.24 3.06 April 3.95 k.3h 3.68 3.47 May U.57 5.H 4.30 4.06 June 5-03 5.98 4.9^ 4.66 July 6.59 8.03 6.87 6.-48 August 6.95 8038 7.09 6.69 September 5.7^ 6.86 4^87 ^•?9 TOTALS 53.00^ 59=63 48,69 45.93 1-6 ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57^ (continued) In Inches • s Pamo : San Pasqual Season : Sutherland : Reservoir : Reservoir : Hodges and month : Reservoir ; site^ : site : Reservoir 19^i|-U5 October U.65 5.22 3.75 3.51^ November 2.78 3.22 3.17 2.99 December 2.87 3 -08 2.69 2.54 January 2.68 2.75 l.kk 1.36 February- 2.6U 2.31 2.26 2.13 March 2»li+ U.65 2.79 2.63 April 5.35 5.07 h.kk 4.19 May 5.19 5.93 5-95 5.61 June 4.99 5.63 5.55 5.23 July 5.93 7.28 6.77 6.39 August 5.I4O 5.61 6.23 5.88 September 5.62 6.kl 6.56 6.19 TOTALS 50.24c 57.22 5l.60<^ 48.68 19l+5_U6 October 1^.66 5.22 4.77 4.50 November 3-93 i^.03 3.81 3.60 December 2.67 2.77 2.86 2.70 January 3«07 2.89 2Ak 2.30 February 2.93 2,72 2.86 2.70 March 3.25 3.2i^ 3.39 3.20 April 3.93 k.l6 3.39 3.20 May 4.78 3.kQ U.56 4.30 June 6.21 7 = 31 7.10 6.70 July 6.17 l.ko 7.10 6.70 August 6.1^2 7.76 7.10 6.70 September 5.88 6.87 6.25 5.90 TOTALS 53.90^ 59.85 55.65^ 52.50 I9U6-U7 October k.62 5olU 3.85 4.67 November 2.99 3.11 2.38 2.74 December 2.iti^ 2.29 1.42 3.58 January 3.16 3.01 2.32 2.49 February 2.83 2.73 2.10 2.14 March 3.3i+ 3.52 3.69 3.36 April 4.65 5.38 5.04 4,78 May 5.51^ 6.40 5.87 5.61 June 5.89 6.99 6.76 6.30 July 7.91 9.24 9.02 8.14 August 6.72 l'9h 7.63 7.41 September 5.91 7.08 6.30 5.94 TOTALS 56.00^ 62.82 56.39 57.16 ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIBGUITO RIVER WATERSHED FOR THE PERIOD 1936--37 THROUGH 1956-57* (continued) 1-7 In Inches t> • Pamo ; San Pasqual ; Season 2 Sutherland ; Reservoir s Reservoir ; Hodges and month : Reservoir : site^ ; site t Reservoir 19hl~k& 1 October k,hk 5,00 4,11 i+,25 November 3.i^9 3.69 2.75 3,31 December 2o52 2,62 2,63 3,16 January- 3.16 3.36 2,9^^ 1.39 February 2,66 2o90 2,66 2,55 March 3»10 3 = 39 3,47 3,21+ April U,28 if, 85 5o07 I+.62 May 5.52 6,71 6.1^7 6.03 June 5.U2 6,59 6,62 5«99 July- 6=81^ 8,76 8,50 7.75 August 6o20 7«78 7.75 6,58 September 5'9h 7.23 7,50 5,1+6 TOTALS 53»57^ 62,88 60,1+7 54.33 I9U8.I+9 October 3-9^ i^o73 3.87 3«99 November U0O9 I+.96 3«85 i+,30 December 2,38 2,59 1,85 1,78 January 2.llf 2,07 1,29 1.56 February 2o06 1.97 1,70 l,U3 March 2»91 3 '2k 3ol5 1,21 April k.ok h.83 l+,58 1+,01 May i+081 5,58 5»31 5,06 June 6«19 7,39 6,99 6.62 July 6.61 8, lit 7.38 6,99 August 6o73 8.23 6,66 7»35 September 5.92 6,91 6.22 6,26 TOTALS 51. 82° 60, 6U 52,85 50.56 19^+9-50 October i^o8i^ 5M l+,U9 5,20 November 3 = 93 U.06 3»55 3 = 77 December 2.79 2,79 2,11 2,57 January 2,20 2,05 2.50 1,76 February 2,1^7 2,32 1,21 1,74 March 3.53 3»82 3.UI+ 3,1+1+ April U.09 11,78 U,13 i+,03 May U,86 5,8U 5,1+0 5,00 June 6.26 765 6,93 6.1+9 July 6..3h 8.26 7 = 79 6,96 August 5 = 92 7 '73 8,82 6.80 September 5'Ok 6,33 5.5T 5.22 TOTALS 52.1+7*= 61 ,10 55.94 52.98 1-8 ESTIMATES OF MOWTHLY EVAPORATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57^ (continued) In Inches : Pamo ; San Pasqual Season : Sutherland : Reservoir : Reservoir : Hodges and month : Reservoir : site^ : site t Reservoir 1950-51 1 October i^.55 U.9I 5.OU 3.15 November 3.05 3.88 3'^ 2.75 December 2.61 2.70 2.U7 2.01 January 2.02 1.95 2.33 1.72 February- 2.08 2.13 2.01 1.91 March 3A3 k.07 U,7l 3=86 April 3.05 3.17 3.85 2.1+0 May U.35 5.10 5.65 5.13 June 5. Ill 6.37 6.90 5.8i+ July 6.13 7.33 7.91 6.65 August 5»5if 6.51 8.01 6.02 September k.hS 6.11 5.82 1+.85 TOTALS 46.71'' 54«23 58.18 1+6.29 1951-52 October k.ok U.29 U.66 1.02 November 2,61 2.69 2.88 2.61+ December 1.77 1.57 1.15 1.3k January 1.60 1.2U 1.58 1.16 February 2.31 2.27 1.85 2.10 March 2.11 2.15 2.75 2.02 April 2.U9 2.69 3.31 2.61 May U.63 5.80 5.91 5.29 June i+,90 6.01 6.1k 5.02 July 6.03 7.42 7-55 6.17 August 6.16 T.kk l.kk 6.18 September 5.85 6.60 6.10 5.29 TOTALS U4.50^ 50.17 51-32 1+1. OI+ 1952-53 October i+.60 1+.92 k.l6 3.70 November 2.88 2.90 3M 2.16 December l»93 1.86 1.93 1.1+2 January 2.19 2.21 2.29 1.62 February 2.81 3-09 2.52 2.66 March 3.03 3'^ If. 58 3.36 April 3-3^1 3.80 1^.13 3«55 May i+.90 6.11 6.05 5.72 June 5-37 6.30 -J.kd 5-50 July 6.18 7.71 7.66 6.22 August 6.07 7.10 6.83 6.02 September 5.U 6.11 5-79 5.06 TOTALS i+S.71^ 55.59 56.88 1+6.99 ESTIMATES OF MOWTHLY EVAPORATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHETi FOR THE PERIOD 1936^31 THROUGH 1956=.57^ (continued) In Inches Season and month Sutherland Reservoir Pamo Reservoir site^ 2 San Pasqual ■; Reservoir ; site Hodges Reservoir 1953-5^ October November December January February March April May June July August September TOTALS 195*^-55 October November December January February March April May June July August September TOTALS 1955-56 October November December January February March April May Jxme July August September TOTALS 5.01c 5.60 3 -212 3.38 3.51= 3'lh 1088C I069 3.02c 3 = 18 2.3^c 2.28 3.26C 3^5h U0I+8C h,19 5.05° 5-97 5.85° 6.91 5.69c 6.62 5.81^ 6.2I1 1+9. lU 53.9^ k.hl h.'^k 2.83 2.95 2.26 2.23 2A2 2.03 2.1^6 2.1+2 3.37 3.59 3.7^^ I+.32 3.82 1+.12 5 = 65 5.98 6.11+ 6.60 6.06 6.1+1+ 5-78 6.29 i+9.00 51.51 3.92 3.98 2.75 3.01 I.5U 1.70 2.11 1.77 1.86 1.95 3.17 3.72 3-30 3.31 4.30 1+.83 5.75 6. 31+ 6.58 7.10 6.15 606I+ 5. 61+ 6.39 61.1+5 1+7.07 50.7^ 57.89 1+.02 2.99 1.58 1.1+1+ 1,91+ I+.26 1+.21 6.1+1 7.22 8.1+9 7.71 7.36 57.63 1+.59 2.76 2.81 1.33 3-27 2.62 3.19 i+.17 5.07 5.3^ 5.30 1+.61+ 1+5.09 1+1,06 2.65 2. 01+ 1.11 0.93 1.58 3.12 2.93 I+.30 5.3'+ 5.65 5.37 1+0.00 I-IO ESTIMATES OF MONTHLY EVAPORATION AT SELECTED SITES IN SAN DIEGUITO RIVER WATERSHED FOR THE PERIOD 1936-37 THROUGH 1956-57^ (continued) In Inches Pamo : San Pasqual Season : SutherleuQd : Reservoir : Reservoir : Hodges and month : Reservoir : site^ : site ; Reservoir 1956-57 October 3.U6 3.76 4.30 3.00 November ^.39 kM '+.98 3.i^9 December 2.9^ 3.13 3 = 9i^ 2.28 January 1.29 1.13 1.80 0.91 February 1.7^ 1.63 1.82 1.18 March 2.49 2.77 3o26 2.35 April 3-15 3.81 1^.29 3.10 May 3.55 3.73 5.18 3.92 June 5.62 6,20 6.9U 5.22 July 6.87 -j.hk 8.10 6.00 August 5.98 6.78 7.29 5.16 September 1+.88 5.76 6,16 4.11 TOTATfi 46.36 50.57 58.06 i+0.72 Values shown are based on pan records adjusted to represent conditions of evaporation from large bodies of water. Estimated from measured values of evaporation at Sutherland and San Vicente Dams. Estimated from measured values of evaporation at El Capitan Dam. Estimated from measured values of evaporation at Hodges Dam. APPENDIX J RESULTS OF SUBSURFACE EXFLORATION AND SOIL TESTS AT DAM AND RESERVOIR SITES IN SAN DIEGUITO RIVER WATERSHED (J-1) TABLE OF CONTENTS RESULTS OF SUBSURFACE EXPLORATION AND SOIL TESTS AT DM AND RESERVOIR SITES IN SAN DIEGUITO RIVER WATERSHED Table No . J-1 Results of Soil Tests at Dam and Reservoir Sites in San Dieguito River Watershed J- 3 J-2 Logs of Exploratory Holes at San Pasqual Dam Site in San Dieguito River Watershed Test Hole No. 1 J- 5 Test Hole No. 2 . J- 6 Test Hole No. 3 J- 7 J-3 Results of Water Tests at San Pasqual Dam Site in San Dieguito River Watershed Flow Tests .......... J- 8 Holding Tests ..... J- 9 Gravity Test ' . J-IO (J~2) is I o iH • oo CM 1*4 r! S O B O (■4 i4 «4 A^ it; S^ E ^ M C tU t> f ^ » C 9 a. ,) B -a •»< o. o o a 4 •* f' to 6 ii ^ s << o 6- CI o 5 I o o CO o O O ^ a|o e B f: 3 P. c o +» a B o z CO Q. C J*- c ^ IPC ?? o 2 ^ s 5 U3 £ s ^ ■^ & o ^ ^ ^ ^ s o o CO ON «^ ! 1 1 1 1 1 1 D 1 D ! 1 1 1 g § !§ ^ § CO oo >R o o o o § o B OO & e 3 o, B o z CM R S o o 74 § § eg eg m a>oa ""_? J* • C4 CQ ^tn • o OT • M S o> i „ W • t/l 9 Ed H ».rt »«-« -•JoJ -tcfi OT « g . • -We* r^ -hS U ° M o w e« to §" HI ca o 1-4 otPQ CM CQ e J-3 o o o o « o o BA ON e 1 o\ OV 1 a, B s> i e « • oa (a oCQ •>m 4? o» Ck e o^-_; ■H • 'sO 0^ iH (S CM m tr,ai ft • t/l • to • to a to s . 8 o, 8 o. 8 , t> f/i ♦ to to » to • o CQ .a .5 > «.-< .s -w • -w • -W_J -w • rH « (S » o: o OS • DC ^ 8 . n . s . R » ** • O « • s -•^2 -t?^ ctO ^^B 4!' o t4 • i-i e tH • rt 0. 1^° W 1^ H » to f * to f J-4 9l O le O ■^ - £ ;^ c c ts. •H B >H « 13 • ^ i • E • ?^ «^ 4* IM fll O «> ^ O 5 k •\N C a XI • 4* +> 5 c 3 €1 p. r-l 3 «H ^ Ct 03 O h u 3 a 00 n -H 3 S c o o Ml a. a. c o Si o CO rH . rH rH M • ■< Ul fri B ^ ^ >R S:: o o 1 1 1 a 1 >5^ ?^ o o B ON ■3^ ON 00 ON NO 3 •a a o CM 3 3 a. a a. a a. c o c 3 rH o. a o. c c o I NO VA ^ Of ji- ^ NO ir4 00 ooji-e^Mifvovoe^ i-i d- e^ CM ^ d ® I. -rt o «> TJ ts » 4» -P '-'3d a o. B. § S e 3 o o w u o J-5 TABLE J-2 LOGS OF EXPLORATORY HOLES AT SAN PASQU/iL DAM SITE IN SAN DIEGUITO RIVER WATERSHED Test Hole Number s 1 State Location Number s 13S/1W-6N3 Elevation of Ground Surface ; 333 feet^ U.S,G„S, datum Date Com pleted; February Ij 1958 Depth intervalj, s in feet ; Material 0- 1 Sandy soilo 1- 22 Brown sandj medium to fine, 22- 41 Tan sand, medium to fine. ifl- 56 Tan sand;j medium to coarse. 56- 61 Tan sand J medium to coarse, some gravel. 61" 65 Tan sand, medium to coarse. 65- 71 Tan sand, medium to coarse, some gravel, 71= 81 Tan sand, medium to coarse „ 81- 84 Tan sand, medium to coarse, some gravel, 84- 86 Tan sand, medium to coarse, 86- 87 Tan sand, medium to coarse, some gravel. 87=117 Fractured and weathered granodiorite, 81^ core recovery. J-6 LOGS OF EXPLORATORY HOLES AT SAN PASQUAL DAM SITE IN SAN DIEGUITO RIVER WATERSHED (continued) Test Hole Number s 2 State Location Number ; 13S/2W-1IJ. Elevation of Ground Su rface: 445 feet, U.S.G.S. datum Date Completed; February lOj 1958 Depth interval J, t in feet g Material 0- 2 Top soil, red wash water, 2- 6 Soft decomposed granite, red wash water. 6- 14 Firm decomposed granite, red wash water. 14_ 31 Firm decomposed granite, brown wash water, 31_ 32 Solid decomposed granite, brown wash water, 32- 45 Firm decomposed granite, brown wash water. 45=, 46 Clayey decomposed granite, brown wash water. 46- 54 Firm decomposed granite, brown wash water. 54- 60 Solid decomposed granite, brown wash water. 60- 88 Hard decomposed granite, brown wash water. 88-100 Badly weathered crumbly tonalite, 8^ core recovery. J=7 LOGS OF EXPLORATORY HOLES AT SAN PASQUAL DAM SITE IN SAN DIEGUITO RIVER WATERSHED (continued) Test Hole Ninnber ; 3 State Location Nimber g 13S/2W-1R2 Elevation of Groxi nd Surface s 395 feet, U.S.GoS. datum Date Completed; February 15 j 1958 Depth interval^ t i n feet % Material O- 2 Top soil J red water „ 2- 4 Soft decomposed granite,, red watero 4- 8 Soft decomposed granite, brown water, 8-17 Firm decomposed granite, brown water, 17-18 Rock, 18-25 Firm decomposed granite, brown water, 25-29 Solid decomposed granite, brown water, 29-31 Firm decomposed granite, brown water, 31-35 Hard decomposed granite, brown water, 35-55 Weathered and fractured transition zone between granodiorite and tonalite, 70^ core recovery. J-8 TABLE J-3 RESULTS OF WATER TESTS AT SAN PASQUAL DAM SITE IN SAN DIEGUITO RIVER WATERSHED Flow Tests ; Depth : Water pressure 5 : Water loss, : Duration Test hole s interval. ; in poxinds : in gallons % of test. number I in per % per ; in : feet : square inch % minute s minutes 1 97-107 52 6.7 14 80 8.3 14 100 9.8 14 107-117 65 8.1 14 120 11.7 14 80 6.8 14 2 90-100 75 8.0 14 100 12.7 14 55 8.6 14 3 35-45 50 0.8 14 80 2.1 14 105 4.3 14 75 3.S 14 55 2.6 14 45-55 60 1.2 14 90 3.1 3 80 2.8 11 115 5.0 14 80 2.1 14 55 1,6 14 J-9 RESULTS OF WATER TESTS AT SAN PASQUAL DAM SITE IN SAN DIEGUITO RIVER WATERSHED (continued) Holding Tests s Depth % o Water pressure *y Test hole t interval^ s Time, « in number s in : : feet ; in seconds o P lounds per square inch a Trial 1 « Trial 2 s Trial 3 1 107-117 15 30 45 60 65 10 4 120 30 15 7 5 80 15 5 3 3 35-45 15 30 55 75 5 100 5 45-55 15 30 45 60 120 75 60 45 30 85 57 43 33 20 _=_ i J-10 RESULTS OF WATER TESTS AT SAN PASQUAL DAM SITE IN SAN DIEGUITO RIVER WATERSHED (continued) Test hole number: 2 Gravity Test Depth of hole, in feet: 59 Diameter of hole J in feet: C .3 Time _: Depth to water added to : Average water loss, in Minutes : Seconds s test hole, in feet : gallons per minute full 20 0.33 .522 34 0.5 .466 53 0.66 .389 1 10 0.S3 .375 1 24 1.0 .377 2 1.33 .351 2 34 1.66 .342 3 20 2.0 .317 4 35 2.83 .325 6 2 3.75 •328 6 10 3.92 .336 6 30 4.0 .325 6 45 4.25 .332 7 4.33 .327 7 30 4.66 .328 d 4.92 .325 8 30 5.1 .317 9 5.5 .322 9 30 5.75 .320 11 — - 6.7 .322 13 -» 7.8 .317 15 — B.S .310 16 ~ 9.3 .307 19 ■>- 10.9 .303 20 — . 11.2 .296 21 •.- 11.4 .287 23 ■~> 11.8 .271 25 « . 11.98 .253 39 — 13.20 .179 Al — 13.45 .173 55 <__ 14.24 .137 APPENDIX K ESTIMATES OF COSTS I (K»l) TABLE OF CONTENTS ESTIMATES OF COSTS Page Estimated Cost of Land and Improvements for San Pasqual- Main Lake Hodges Basin Ground Water Development o » o o « . o o K-5 K=2 Estimated Costs of Wells j, Pumping Plants and Conveyance Facilities at San Pasqual=Main Lake Hodges Basin to Produce a Seasonal Yield of 3<)200 Acre-Feet oo.oo<,«.o« K=6 K'-3 Estimated Costs of Wells ^ Pumping Plants and Conveyance Facilities at San Pasqual-=Ife.in Lake Hodges Basin to Produce a Seasonal Yield of i;^800 Acre=Feet ooooooooo. K-8 K=U Estimated Costs of Wells,, Pumping Plants and Conveyance Facilities at San Pasqual=Main Lake Hodges Basin to Produce a Seasonal Yield of 65,000 Acre-Feet «„,,oooo»o K-10 K-=$ Estimated Cost of Enlargement of Sutherland Reservoir to a Storage Capacity of 375.il3C Acre=Feet oooooooooooo K-12 K-6 Estimated Cost of Land and Improvements for Three Sizes of Dam and Reservoir at the Pamo "B" Site on Santa Ysabel Creek in San Dieguito River Watershed ,oo». .«<>.» K-I3 K-7 Estimated Cost of Pamo "B" Dam and Reservoir With Storage Capacity of 90,000 Acre=Feet <,<,oo«o., ooooooooo. K-IU K-8 Estimated Cost of Pamo^Miramar Condiiit to Accompany Reservoir of 90s 000 Acre=Feet Capacity 000000000.000 K=17 K=9 Estimated Cost of Pamo "B" Dam and Reservoir With Storage Capacity of 135,., 000 Acre=Feet 0000. .ooo........ K-I8 K-10 Estimated Cost of Pamo=Miramar Conduit to Accompany Reservoir of 135^000 Acre-Feet Capacity 0.0.0..00... K-21 K-11 Estimated Cost of Pamo "F» Dam and Reservoir With Storage Capacity of l63siUOO Acre-Feet oooooo.o.o...... K-22 K-12 Estimated Cost of Pamo=Mramar Conduit to Accompany Reservoir of 1635,U00 Acre-Feet Capacity ..oooooooo.. K-25 K-I3 Estimated Cost of Land and Improvements for Three Sizes of Dam and Reservoir at the San Pasqual Site on San Dieguito River in San Dieguito River Watershed 000000. .» K-26 K-lU Estimated Costs of Wells j Pumping Plants, and Conveyance Facilities for Ground Water Development Within San Pasqual Reservoir Area 900000.0000000000000 K=27 (K-2) Table No « Page K=l5 Estimated Cost of San Pasqual Dam and Reservoir With Storage Capacity of 100^000 Acre-Feet ooo«o<,..o.o.«o K-29 K«»l6 Estimated Cost of San Pasqual-Miramar Conduit and San Pasqual Reservoir-Lake Hodges Canal to Accompany Reser- voir of IOO5OOO Acre=Feet Capacity and Ground Water Storage Bpletion of 37.gOOO Acre-Feet oooooooooooo.o.oo K-31 K-I7 Estimated Cost of San Pasqual^ Dam and Reservoir With Storage Capacity of 220,000 Acre-Feet ooooooooo-o.o.ooo K-33 K-I8 Estimated Cost of San Pasqual-Miramar Conduit and San Pasqual Reservoir-Lake Hodges Canal to Accompany Reservoir of 220^,000 Acre-Feet Capacity and Ground Water Storage Depletion of 37s 000 Acre-Feet o«oooo»«<>.. K=36 K-I9 Estimated Cost of San Pasqual Dam and Reservoir With Storage Capacity of 335^000 Acre-Feet 00000. 00000. 00. .. K-38 K-20 Estimated Cost of San Pasqual-Miraraar Conduit and San Pasqual Reservoir-Lake Hodges Canal to Accompany Reservoir of 335siOOO Acre-Feet Capacity and Ground Water Storage Depletion of 37sOOO Acre-Feet 000000000.0.000.0 K-Iil K"=21 Estimated Cost of Land and Improvements for Three Sizes of Dam and Reservoir at the Super Hodges Site on San Dieguito River in San Dieguito River Watershed 0.0.00000 K=U3 K-22 Estimated Cost of Relocating Highways for Three Sizes of Dam and Reservoir at Super Hodges Site ooooo.o.oooo. K=iU; K°23 Estimated Cost of Super Hodges Dam and Reservoir With Storage Capacity of 157,300 Acre=Feet ooooooo.ooo.oo K-U^ K'»2ii Estimated Cost of Super Hodges -Miramar Conduit to Accompany Reservoir of l$7s,300 Acre=Feet Capacity ooooo.o.,o.., K=i;7 K=25 Estimated Cost of Super Hodges Dam and Reservoir With Storage Capacity of 3IO5OOO Acre-Feet o.«,oooooooo. K=-U9 K=26 Estimated Cost of Super Hodges-Mixamar Conduit to Accompany Reservoir of 310^000 Acre-Feet Capacity 000.00...0000 K-51 K-27 Estimated Cost of Super Hodges Dam and Reservoir With Storage Capacity of 36$, 000 Acre-Feet 000000000.000 K-53 K-28 Estimated Cost of Super Hodges -Miramar Conduit to Accompany Reservoir of 36$j,000 Acre-Feet Capacity 000000.000.0. K-55 K-29 Estimated Cost of Enlargement of San Vicente Reservoir to a Storage Capacity of 1135,600 Acre-Feet 00, 00. 00, .00. K-57 (K-3) Table No o Page K-30 Estimated Cost of Enlargement of San Vicente Reservoir to a Storage Capacity of 168^,200 Acre-Feet oooo<.«o,,oo, K-58 K'=31 Estimated Capital and Annual Costs of Required Enlargements of San Vicente Reservoir Under Potential Plans of Correspondence Inter^Departmental Communication, Dated March T? 1956 j Regarding Relocation of State Sign Route 78 and Estimated Cost Thereof XXI iy^O OOOOOOOOOOOOOOOOOOOOOOOOOOOO IX \J\J Letter, Dated February lit, 1958s Requesting Current Estimates of Cost of Relocation of Those Portions of U, S, Highway NOo 395 and State Sign Route No. 78 Affected by Three Po- tential Reservoirs at the Super Hodges and San Pasqual Sites « o « K-6l Inter-Departraental Communicationj, Dated May 6j, 1958 j, Containing Estimates of Cost of Relocation of Those Portions of Uo S« Highway No„ 395 and State Sign Route Noo 78 Affected by Three PotentisQ. Reservoirs at the Super Hodges and San Pas- QlIo.I 0XX'6S OOOOOOOOOOOOOOOOOOOOOOOOOOOO ^^ Inter-Departmental Communication^ Dated J\me 65, I9589 Requesting Substantiation of Selection of the Route North of San Pasqual Valley Rather Than the Previously Recommended Route Through Green Valley for Relocation of State Sign Route Noo 78 as a Result of Construction of Potential Reservoirs at the San X aSC^llclX OXXtC OOOOOOOOOOOOOOOOOOOOOOOOOOO L\'^\J^ Inter-Departmental Communication^, Dated July 2, 1958 5, Sub- stantiating the Choice of the Route North of San Pasqual Valley Rather Than the Previously Recommended Route Through Green Valley for Relocation of State Sign Route Noo 78 as a Result of Construction of Potential Reservoirs at the San Pasqual Site oooooooooooooooo«oooo K-o7 Letter, Dated October 6j, 1958 5, and Two Enclosures Regarding Allocation of Cost of Relocation of Uo S„ Highway Noo 39^ Across an Enlarged Lake Hodges oooooooo»ooo. 00000 K-68 (K-U) K.5 TABLE K-1 ESTIMATET, COST OF LAND AND IMPROVEMENTS FOR SAN PASQUAL-MAIN LAKE HODGES BASIN Ga(;UND WATER DEVELOPMENT GENERAL FEATURES Area of ground water basin, in acres ^1,630 Land necessary for project^ in acr ;:. Owned by City of San Diego Private Ly-owned 6,220 3,620 Total 9,8iK) Number of privately-owned parcels 70 CAPITAL COSTS Property owned by City of San Diego* Land Improvements Privately-owned property* Land $1,828,500 351,000 l,02i+,200 $2,179,500 Improvements Acquisition 1,397,000 70,000 2,^91,200 Subtotal $4,670,700 Contingencies, 15^ 700,600 PROJECT TOTAL $5,371,300 ADDITIONAL COST TO CITY OF SAN DIEGO Privately-owned property $2,1+91,200 Contingencies, 15^ 373,700 TOTAL $2,861+, 900 * Includes excess lands and improvements which are outside of the San Pasqual-Main Lake Hodges Basin that would probably be acquired in lieu of payment of severance damages due to reducing the parcel to less than an economic unit or reducing the use of the land to an amount lower and less d6sirable than that now enjoyed. K-6 estimatfa) costs of wells, pumping plants and conveyance facilities at san pasqual^-min lake hodges basin to produce a seasonal yield of 3<,200 acre-feet Maxdmum storage capacity utiliaeds 13 $700 acre-feet Average depth to ground water at ma^ltn-um basin depletion? 28 feet Item _QiianW;;^ Unit price Cost CAPITAL COSTS Wells J pumps and motors Pipe Steel, concrete coated, mortar linedj fiimiish and install 12°gage 6-in. diam» 12='gage 8 -in. diam, 12"gage lO-irio diarao 12"gage 12'"in» diam. Valves Meters, Sparling San Pasqual Basin-l«ake Hodges Canal Excavationj unclassified Embankment Trimming Concrete lining Culverts Bridges J, farm road access Fencej, ii-atrand barbed wire, both sides of canal Siphons Excavationj, unclassified Backfill, compacted Backfill, consolidated Pipe, steel, mortar lined, concrete coated, furnish and install 22-inch I.D. l6-inch I.D, Inlet and outlet struct'are SubtotsJ. (no additional cost)* ii,000 linofte $ 6,200 linoftc 13,000 lin.fto U,300 lin.ft. 27s300 cuoydo 23s200 cuoyda l40,U00 sqcyd, 2,850 cuoydo 10 each 15,600 cu«yd. 6^0 cu.ydo 8,750 cuoyd. 5,100 linofto 1,600 lincft. 1.90 2.50 3.20 3.90 Ivonp sum lump sum 0.50 0,U0 Oo75 25oOO l\imp simi 1,200.00 0.50 3.00 0.75 8.it5 6.10 lump sura $ 7,600 15,500 Ul,600 160800 $ 7,700 U,700 13,700 9^00 30,300 71,300 12,000 12,000 27 miles 2,500.00 67,500 7,800 2,000 6,600 1|3,100 9,800 3.500 81,500 7,700 U,700 136,600 12,000 67,500 72.600 t 382,800 ESTIMATED COSTS OF WELLS, PUMPING PIANTS AND CONVEIANCE FACILITIES AT SAN PASQUAL-MAIN LAKE HODGES TO PRODUCE A SEASONAL YIELD OF 3,200 ACRE-FEET (continued) I BASIN s i Unit Item J Quantity : price • Cost Administration and engineering, 10/6 $ 38,300 Contingencies J 1S% 57,U00 Real estate^ 5,371,300 Subtotal $5,8U9,8oo Interest during construction^ h% i"or one-half of 1-year construction period 117,000 TOTAL $5,966,800 ANNUAL COSTS Interest, 3oS% $ 208,800 Amortization, UO-year sinking fund at 3»5^ 70,600 ^ Operation and maintenance , .. \ 6,000 Electric energy for pumping 12,600 TOTAL $ 298,000 ao It is assumed that the existing wells, and pumping facilities purchased as part of the lands and improvements would be used in producing the present seasonal yield of 3,200 acre-feet and that no new wells or pumping facilities woTold be needed o b. Detail costs of land, improvements, and acquisition are presented in Table K-1. TABLE K=3 ESTIMA.TED COSTS OF WELLS,, PUMPING PLft.NTS AND CONVEYANCE FACILITIES AT SAN PASQUAL=MAIN lAKE HODGES BASIN TO PRODUCE A SEASONAL YIELD OF UgSOO ACRE=FEET Maximxtm storage capacity utilized 2 27i5 000 acre-feet Average depth to ground water at maximum basin depletions ii8 feet Iteni Quantity Unit price Cost CAPITAL COSTS Wells (new)* Drill, case 5, perforate j, gravel pack and develop 2 new wells 5, diameter l6=ino Ptimps (new)^ Motor,; deep well turbine pump J, furnish and install kO HP 30 HP 315 linoftc I 33oOO $10,U00 $ lO^iiOO 1 each 1 each 5. . 200 o 00 U',800oOO 5 s 200 ii,&00 10s 000 Pipe Steely concrete coated, mortar lined n furnish and install 12=gage 6-ino diam„ lic,000 lin„fto lo90 7,600 12-=gage 8<=ino diamo 79600 linofto 2„50 19^000 12-gage 10=in„ diam. I39IOO lin„ft„ 3o20 ills 900 12-gage 12='ino diamo 5o900 lin.ft. 3.90 23,000 91,500 Valves lump sum 8^200 8,200 Meters s Sparling lump sum 5,ii00 5jUoo San Pasqual Basin=Lake Hodges Canal Excavations unclassified 28,800 cu.yd. 0.50 lUjUoo Bnbaakment 2k. ^00 ou.ydo 0„i;0 9,800 Trimming U3,i;00 sqoydo 0„75 32,600 Concrete lining 3,100 cuoydo 25oOO 77.500 Culverts lump sum 12,000 ll;6,300 Bridges p farm road access 10 each Is200o00 12 .,000 12,000 Fence;, l;=strand barbed wirej, both sides of canal 27 miles 2<,500,00 67,500 67,500 Siphons Excavation^ unclassified 165800 cu,yd. o„5o 85UOO Backfill s compacted 820 cuoydo 3.00 2,500 Backfillj consolidated 9,500 cuoydo 0„75 7,100 ESTIMATED COSTS OF WELLS, PUMPING PIANTS AND CONVEYANCE FACILITIES AT SAN PASQUAL-MAIN lAKE HODGES BASIN TO PRODUCE A SEASONAL YIELD OF U,800 ACRE-FEET (continued) <> o Itan s s Unit Quantity t price o Cost CAPITAL COSTS Pipe, steel, mortar lined^ concrete coatedj furnish and install 26=inch I,D, 20-inch I,D„ i Inlet and outlet structure 5,100 lin.ft, $ 11.35 1,600 lijioft. 7.50 lump sum $57^900 12,000 3,800 4 91,700 Subtotal $ lUi3,000 Administration and engineering^ lO/K Wi,300 Contingencies, 1^% 66,i;00 Real estate^ » 371. 300 SubtotsQ. $5,925,000 Interest during construction, h% for construction period one-half of l=year 118,500 TOTAL $6,01^3,500 ANNUAL COSTS Interest, 3o5^ $ 211^500 Amortization, UO-year sinking fund at 3<>5^ 71,500 Operation and maintenance 6,000 Electric energy for pumping 17^300 TOTAL $ 306,300 a* Costs based on assumption that 2 new wells, pumps and motors would be needed in addition to the existing equipment purchased with lands and improvements » Cost of existing wells and pumping equipment included in the value for real estate. bo Detail costs of land, improvements, and acquisition are presented in Table K=lo I K~10 TABLE K-ii ESTIMATED COSTS OF WELLS ^ PUMPING PLANTS AND CONVEYANCE FACILITIES AT SAN PASQUAL-MAIN LAKE HODGES BASIN TO PRODUCE A SEASONAL YIELD OF 6,000 ACRE-FEET Maxunum storage capacity utilized: UljOOO acre-feet Average depth to ground water at maximum basin depletions 71 feet Item Quantity Unit price Cost CAPITAL COSTS Wells (new)^ Drill, case, perforate, gravel pack and develop 6 new wells J diameter l6=in. Pumps (new) ^ Motor, deep well turbine pump, furnish and install 20 HP 2$ HP 30 HP [^0 HP 760 lin.ft, $ 33.00 $25,100 $ 25^100 1 each 2 each 2 each 2 each 3,ioo»oo 3,$00o00 U,8oo,oo 5,200,00 3,100 7 s 000 9 J 600 io„Uoo 30,100 Pipe Steel, concrete coated, mortar lined, fvimish and install 12=gage 6-in„ diam<, 12~gage 8-ino diain, 12=gage lO^in, diam, 12=gage 12='in, diam. Valves Meters, Sparling 1;<,000 lin,ft, 10^800 lin«fto 19,700 lin,ft. 8„i;00 lin.ft. 1.90 2c50 3.20 3.90 lump sum lump sum 7,600 27,000 63,000 32,800 10,000 7,100 130, Uoo 10,000 7,100 San Pasqual Basin-Lake Hodges Canal Excavation, unclassified Embankment Trimming Concrete lining Culverts 30,000 cu.yd. 25s 600 cu.ydo U7s000 sq„yd, 3,300 cuoyd. 0.50 o.Uo 0.75 25.00 lump sum 155,000 10,200 35,300 82,500 12,000 155,000 Bridges 5 farm road access 10 each 1,200.00 12,000 12,000 Fence, U=strand barbed vrire both sides of canal Siphons Excavation, unclassified 27 miles 17<,600 cu.yd. 2,500.00 0,50 67,500 8,800 67,500 K-11 ESTIMATED COSTS OF WELI5, PUMPING PIANTS AND CONVEYANCE FACILITIES AT SAN PASQUAL-MAIN LAKE HODGES BASIN TO PRODUCE A SEASONAL YIELD OF 6,000 ACRE-FEET (continued) Item Quantity Unit price Cost CAPITAL COSTS Backfill,, compacted Backfills, consolidated Pipe^ steely mortar lined^, concrete coated^ furnish and install 28-inch I,D„ 22-inch I.D, Inlet and outlet structure Subtotal Administration and Engineering^ 10^ Contingencies,, 1^% Real Estate^ Subtotal 900 cu.yd. $ 3oOO 12jlOO cu.ydo Oo75 5,100 lin.ft. 1,600 linoft. 12,15 8oU5 lump sum 2,700 9,100 62 J 000 13,500 UiOOO $ 100,100 $ 537,300 53,700 80, 600 ^.371,200 $6;i,042^,800 Interest during construction, k% for one-half construction period of l=year 120,900 1 TOTAL $6,163,700 ANNUAL COSTS Interest;, 3-5^ $ 215,700 Amortization, UO-year sinking fund at 3 05^ 72,900 Operation and maintenance 6,500 Electric energy for pumping 21,000 TOTAL $316,100 a. Costs based on assumption that 6 new wells and 7 new pumps and motors would be needed in addition to the existing equipment purchased with lands and improve- ments. Cost of existing wells and pumping facilities included in the value for real estate, b. Detail costs of land, improvements, and acqiiiaition are presented in Table K-1, K-12 TABLE K=^ ESTIMATED COST OF ENLARC2MENT OF SUTHERLAND RESERVOIR TO A STORAGE CAPACITY OF 37,430 ACRE-FEET (Based on prices prevailing in 1958) Capacity s Elevation of crest of dams UoSoG.S. datvun Elevation of crest of spillway; UoS.GoSo datum Elevation of top of spillway gates; U.S.G.So datxm Increase in capacity of reservoirs Existing reservoir 29^680 acre-feet 2p074 feet 2j057 feet Item Unit price Enlarged reservoir 37., 430 acre-feet 2 J 074 feet 2,057 feet 2,070 feet 7^,750 acre-feet Cost CAPITAL COSTS Spillway gates^ addition of Radial gates, 3=13 'x50« Radial gate hoists., 3 Concrete y reinforced 2 piers, intermediate Bridge and rail Reinforsing steel 156 p 000 lbs. 28,500 lbs. 900 cu.yds. 240 cu.yds, 182,000 lbs. I 0.55 0.65 50.00 60.00 0.15 $ 85,800 18,500 45^000 14^400 27,300 Subtotal Administration and engineering, lOjK Contingencies, 15$ Interest during construction, 4$ for one-half of 1-year construction period » TOTAL $191,000 19,100 28,600 4»800 1243,500 ANNUAL COSTS Interest, 30 5$ Amortization, 40-year sinking fund at 3«5$ Operation and maintenance 8,500 2,900 1,000 TOTAL I 12,400 TABLE K»fe- ESTIMATED COST OF tAND AM) IWPf^C^BMENTSi FOR TroEE SIZES OF DAM AMD RESERVOIR AT THE PAMO "B" SITE ON SAMTA IfSABEL CREEK IN SAN DIEGUITO RIVIR WATERSHED K=13 Gross reservoir storage capacity, in acre~feet 163,i^OO 90,000 133.000 GENERAL FEATURES Water surface elevation for design flood, in feet, U.SoG.So datum 1,055 1,081 1,095 La&! '^ --- -"y for p.: ^. -: .. , - n acres Owned by City of San Diego 1,U90 , 1,1+90 1,1+90 Privately=owned 1,860 1^860 1,860 Totals 3p350 3,350 3,350 NuBfber of privately- owned p^cels 19 19 19 CAPITAL COSTS Property owned by City of San Diego K Land " Improvements $ 53, 000 $ 53,000 $ 53, 000 $ 53^000 $ 53,000 $ 53,000 Privately-owned property Land ^ 109. 000 123,000 11+9,000 m. Exceas land 63, 000 U9,000 23. 000 ■ Improvements 82, 000 82,000 82, 000 ■ Acquisition 19, 000 273.000 19,000 273,000 19, 000 273,000 ■ Subtotals $326,000 $326,000 $326,000 Contingencies, 15^ 1+9,000 U9,000 1+9,000 PROJECT TOTALS $3T5>000 $375>000 $375,000 ADDITIONAL COST TO CITY OF SAN DIEGO $273,000 Privately-owned property $273,000 $273,000 Contingencies, 1% i+1,000 Ul,000 1+1,000 TOTAT.S $3ii)-,ooo $31^^,000 $311+, 000 * Excess land is land required to avoid payment of severance damages, or to avoid incurring access road construction costs which would exceed the value of the excess land minus its salvage value [-.Ill TABLE K-7 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 90,000 ACRE=FEET (Based on prices prevailing in 1958) lj,060 feet.. Elevation of crest of dam U.S.GoSo datum Elevation of crest of spillways ls037 feet Height of dam tc spillway ere sty above stream bed; 18? feet Item o Qua ntit CAPITAL COSTS Dam Exploration Diversion of stream and dewatering of foundation Stripping topsoil 211., 200 Excavation for embanionent Foundation Imperrious from borrow pits Random fron stream bed and borrow pits Bnbankaent Impervious Random Random salvage Rock riprap Drilling grout holes Pressure grouting Gravel drains Spillway Excavationj unclassified Backfill Rock riprap Concrete Weir^ cutoff and flip bucket Floor Walls Reinforcing steel Drilling grout holes Pressure grouting cu.ydo 2655,900 cuoydo ls258s20C cu.yd. 2,,017c,80C; cucydo l,094slOO l,720p700 729,100 73 5600- 15 c, 600 lOjZ+OO 33,900 cu«yd„ cu,ydo cu.yd. cUoydo lin.ft, cu.ft. cu.yda 706,300 cuoyd. IjOOO cu.yd. 600 cubyd. 2,800 cu.ydo 3^300 cu.yd. 700 cu.yd, 541,500 lbs. 3,600 lin.ft. 2,400 cu.ft. Capacity of reservoir to crest of spillways 90,000 acre-feet Capacity of spillway with 5-foot freeboard: 83,100 second-feet lump sum $ 40,000 lump sum 0.35 0.70 0.55 0.15 0.12 0o20 2o80 4o00 3.00 3.00 1,50 1.50 2o80 45.00 40.00 50.00 0.15 4.00 3oOO 50,000 73,900 186,100 692,000 0.60 1,210,700 164,100 206,500 145,800 206,100 62,400 31,200 101,700 1,059,500 1,500 1,700 126,000 132,000 35,000 81,200 14,400 7,200 $3,170,500 1,458,500 K-15 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 90,000 ACRE-FEET (continued) o o ; Unit ft • Item s Quantity s price Cost CAPITAL COSTS Outlet Works Excavation Inlet and outlet structures 3.,80O cuoyd. $ 2,00 $ 7,600 Conduit 5,800 cu.yd. lo50 8,700 Backfill 3,900 cuoydo 4.50 17,600 Concrete Pipe encasement lj,620 cuoydo 50.00 81,000 Intake tower 1,090 cUoyd. 60.00 65,400 Reinforcing steel 351,300 lbs. 0.15 52,700 Miscellaineous metalwork 15,000 Ibso 0,45 6,800 Steel pipe, 30~inch diao, intake tower lump sum 7,900 Butterfly valves. 30-inch diao, intake tower 5 each 4,000„00 20,000 Steel pipe^ 42~inch dia. 182,000 lbs. 0.30 54,600 High pressure slide gate lump sum 15,000 Gate valve., 42-inch diao 1 each 5,000.00 5,000 Needle valve, 36-inch diao 1 each 17,000,00 17,000 Pressure regulators 4 each 2,100.00 8,400 Venturi meter lump sum 4,100 Control house lump sum 5.000 $ 376,800 Reservoir Clearing reservoir lands 1,425 ac. 35.00 49,900 Road relocations (truck trails) lump sum 264,000 Access road lump sum 150,000 Caretaker's house and shop lump sum 20,000 483.900 Subtotal 15,489,700 Administration and engineering, 10j6 549,000 Contingencies, 15^ 823,500 Real estate* 375,000, Subtotal $7,237,200 Interest during construction, k% for one- •half of 2-year construction period 28^,500 TOTAL $7,526,700 K-16 Item ANNUAL COSTS ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 90,000 ACRE-FEET (continued) Quantity Unit price Cost Interest, 3o5/^ Amortization, 40-year sinking fimd at 3.5^ Operation and maintenance TOTAL $ 263, UOO 89,000 11.500 ♦ 363^900 * Detail costs of land, improvements and acquisition are presented in Table K-6. K-17 TABLE K-8 iCSTIMATED COST OF FAMO-MIRkMj.R CuIJDUIT TO ACCOMPANY IffiSElW'JlR OF 90,000 ACRE-FEET CAPACITY (Based on prices prevailing in 195^!) Length of conduit, in miles: 24 Inside dicvneter of pipe, in inches; Design capacity of pipe, in second-feet: 25 Cross-sectional area of pipe, in square feet: 6.28 Average velocity, in feet 34 per second: 3»96 Manning's value of "n": 0.0115 Hydraulic radius, in feet: 0.708 HydrauJ.ic slope, in feet per foot: 0.001525 : : Unit • Item : i-ouantity ; : or ice : C iost CiiPITAL GUSTS Excavation, unclassified 325,900 cu.yd. $ 1,20 $ 391,100 Backfill, compacted 22,900 cu.yd. 3.00 68,700 Backfill, consolidated 129,500 cu.yd. 0.75 97,100 Pipe, steel, mortar-lined. concrete coated, 34-inch I.D. 10-gage 116,800 lin.ft, 15.00 1,752,000 8 -gage 4,700 lin.ft. 15.85 74,500 3/l6-inch 2,000 lin.ft. 17.05 34,100 1/4-inch 3,600 lin.ft. 19.70 70,900 Manhole 7 each 300,00 2,100 Manhole and air valve 43 each 460.00 19,800 Manhole and blowoff 26 each 540.00 14,000 Vent structure 20 each 600.00 12,000 Right of way lump sum 100,000 Subtotal $2,636,300 Administration and engineering, 10^ 263,600 Contingencies, 15^ 395,400 Interest during construction, 4^ for one-half of 1- year construction period 65,900 TOTAL $3,361,200 ANNUAL COSTS Interest, 3^5% e 117,600 Amortization, 40-year sinking fund at 3.5^ 39,800 Operation and maintenance ?,400 TOTAL $ 160,800 TABLE K-9 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 135,000 ACRE-FEET (Based on prices prevailing in 1958) Elevation of crest of dam: 1,086 feet, U.S.G.S. datum Elevation of crest of spillways 1,064 feet Height of dam to spillway crest, above stream beds 214 feet Caf)acity of reservoir to crest of spillway: 135,000 acre- feet Capacity of spillway with 5-foot freeboards 78,500 second-feet c Unit t Item 5 Ciuantity s price i Cost CAPITAL COSTS Dam Exploration lump sum $ 50,000 Diversion of stream and dewatering of founda - tion lump sum 50,000 Stripping topsoil 254,500 cu.yd. $ 0,35 89,100 Excavation for embank- ment Foundation 354,600 cu . yd . 0.70 248,200 Impervious from borrow pits 1,780,700 cu.yd. 0.55 979,400 Random from stream bed and borrow pits 3,100,900 cu.yd. 0,60 1,860,500 Hnbankraent Impervious 1,548,400 cu.yd. 0.15 232,300 Random 2,696,400 cu^yd. 0.12 323,600 Random salvage 723,300 cu.yd. 0.20 144,700 Rock riprap 91,400 cu.yd. 2.80 255,900 Drilling grout holes 17,900 lin.ft. 4.00 71,600 Pressure grouting 12,000 CU.ftc 3.00 36,000 Gravel drains 56,600 cu.yd. 3.00 169.800 $4,511,100 Spillway Excavation, unclassified 606,300 cu.yd. 1.50 909,500 Backfill 1,000 cu.yd. 1.50 1,500 Rock riprap 410 cu.yd. 2.80 1,100 Concrete Weir, cutoff, and flip bucket 2,750 cu.yd. 45.00 123,800 Floor 3,ao cu.yd. 40.00 136,400 Walls 740 cu„yd. 50.00 37,000 Reinforcing steel 552,700 lbs. 0.15 82,900 Drilling grout holes 3,600 lin.ft. 4.00 14,400 Pressure grouting 2,400 cu.ft. 3.00 7.200 1,313.800 K-19 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 135^000 ACRE-FEET (continued) «B-»«— 3-=a« 1 III Ml 11 s Unit s Item i Quantity s price ; ( ]ost CAPITAL COSTS Outlet Works Excavation Inlet and outlet structures 3,100 cuojdo $ 2.00 $ 6,200 Conduit 7^600 cu.ydo 1.50 U,400 Backfill 4^900 cu.yd. 4.50 22,100 Concrete Pipe encasement 2,050 cu„yd. 50.00 102,500 Intake tower 1^260 cu„ydo 60.00 75,600 Reinforcing steel 430,300 lbs. 0.15 64,500 Miscellaneous metalwork 15,000 lbs. 0-.45 6,800 Steel pipe,, 30-inch diaoj intake tower lump sum 8,700 Butterfly valves. 30-inch dia. 5 each 4.000.00 20,000 Steel pipe^, 48-inch dia. 278,900 lbs. 0.30 83,700 High pressure slide gate lump sum 21,000 Gate valve, 48~inch dia. 1 each 6,000.00 6,000 Needle valve, 36-inch dia„ 1 each 17,000.00 17,000 Pressure regulators 4 each 2,100.00 8.400 Venturi meter lump sum 4,100 Control house lump sum 5.000 $ 463,000 Reservoir Clearing reservoir lands 1,862 aco 35.00 65,200 Road relocation (truck trails) Ivmip sum 264,000 Access road J Pamo grade to dam Ivmip sum 150,000 Caretaker" s house and shop lump sum 20.000 499,200 Subtotal #6,787,100 Administration and engineering, 10^ 678,700 Contingencies J 15^ 1,018,100 Real estate* 375,000 Subtotal 18,858,900 Interest during construction j, i^ for one- half of 2 -year construction period 35li.|jOO TOTAL $9,213,300 K=20 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 135^000 ACRE-FEET (continued) ANNUAL COSTS Interest J, 3o5^ Amortization J, 40~year sinking fund at 3° 5^ Operation and maintenance TOTAL $322,500 109,000 ,600 $4ii6,10O * Detail costs of land, improvements^ and acquisition are presented in Table K=6o TABLE K-10 K-21 ESTBIATED COST OF PAMO-MIRAMAR CONDUIT TO ACCOMPANY RESERVOIR OF 135,000 ACRE-FEET CAPACITY (Based on prices prevailing in 195^) Length of conduit , in miless 24 Inside diameter of pipe, in inches; Design capacity of pipe^ in second-feet 5 29 Cross-sectional area of pipe, in square feets 7o07 Average velocity, in feet 36 per second: 4»13 Manning's value of "n": 0.0115 Hydraulic radius, in feet: 0.75 Hydraulic slope, in feet per foot: 0.001525 « Unit i Item % Quantity s price s 1 Cost CAPITAL COSTS Excavation, unclassified 342,400 cu.ydo $ 1.20 $ ao,9oo Backfill, compacted 25,400 cu,yd. 3.00 76,200 Backfill^ consolidated 137,200 cu,yd. 0.75 102,900 Pipe, steel, mortar-lined. concrete coated, 36-inch I,D„ 10- gage 114,300 lin.ft. 16.50 1 ,886,000 8- gage 5,200 lin.ft. 17.00 88,400 3/16-inch 3,300 lin.ft. 18.30 60,400 l/4-inch 4,200 lin.ft. 21.25 89,200 Manhole 7 each 325.00 2,300 Manhole and air valve 43 each 490.00 21,100 Manhole and blowoff 26 each 570.00 14,800 Vent structure 20 each 630,00 12,600 Right of way lump sum _ 100,000 Subtotal $2,864,800 Administration and engineering, 10^ 286,500 Contingencies, 15% 429,700 Interest during construction, 4$ for one-half of 1-year construction period 71.600 TOTAL $3,652,600 ANNUAL COSTS Interest, 3 .5^ $ 127,800 Amortization, 40-year sinking fund at 3-5^ 43,200 Operation and maintenance 3,700 TOTAL $ 174,700 K=22 TABLE K-11 ESTIMATED COST OF PAMO »«B»« DAM AND RESERVOIR WITH STORAGE CAPACITY OF 163,400 ACRE=FEET (Based on prices prevailing in 1958) Elevation of crest cf dams 1,100 feet^ UoSoGoSe datum Elevation of crest of spillways lj,079 feet Height of dam to spillway crest., above stream bed: 229 feet Capacity of reservoir to crest of spillways l63,<,400 acre-feet Capacity of spillway with 5-foot freeboard: 75. o 000 second-feet g § Unit c Item s Qraantity g prig's * Cost CAPITAL COSTS Dam Exploration lump sum $ 50,000 Diversion of stream and dewatering of founda- tion Ivmjp sum 50.000 Stripping topsoil 279,500 cuoydo $ 0,35 97,800 Exijavation for embank „ ment Foundation 445o300 cuoydo 0o70 311,700 Impervious from borrow pits 2; 223 ,200 euoyxio 0„60 1,333,900 Random from stream bed and borrow pits 3,855.100 cuaydo 0.65 2,505,800 Bnbankment Impervious 1,933,200 cuoydo Ool5 290,000 Random 3,292,500 «Uoydo 0ol2 395,100 Random salvage 742 400 cuoydo 0o20 lii8,500 Rook riprap 105,200 cUoydo 2o80 294o600 Drilling grout holes 19,900 lin„fto 4<.00 79,600 Pressure grouting 13,300 CUofto 3o00 39,900 Gravel drains 59,800 cUoydo 3o00 ^^isum #5,776,300 : Spillway 1 Excavation. ' unclassified 544-0 500 -auoydo 1.50 816,800 Backim 1,000 CUoydo lo50 1^500 Ebck riprap 410 CUoydo 2o80 1,100 Concrete Weirj cutoff^ and flip bucket 2,790 ©ii^oydo 45oOO 125.600 Floor 3,000 CUoydo 4O0OO 120,000 Wfllls 700 cuoyde 50.00 35,000 Reinforcing steel 496.700 Ibso 0.15 74,500 Drilling grout holes 3,600 HCofte 4o00 U,400 Pressure grouting 2,400 CUoft, 3oOO _ 7.^.2^ 1,196,100 ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 163,400 ACRE-FEET (continued) K-23 • • s Unit Item 1 Quantity ; price : Cost CAPITAL COSTS Outlet Works Excavation Inlet and outlet structures 2,800 cu.yd. 1 2.00 $ 5,600 Conduit 9,200 cu.ydo 1.50 13,800 Backfill 5,900 cu.yd. 4.50 26,600 Concrete Pipe encasement 2,420 coioyd. 50.00 121,000 Intake tower 1,490 cu„yd. 60.00 89^400 Reinforcing steel 508,300 lbs. 0,15 76,200 Miscellaneous metalwork 15,000 lbs. 0,45 6,800 Steel pipe, 30-inch dia.j, intake tower lump sum 9,500 Butterfly valves. 30~inch diao, intake tower 5 each 4,000,00 20,000 Steel pipe, 54-inch .>.» " .-. dia„ 3lUi,000 lbs. 0.30 103,200 High pressure slide gate lamp sum 27,500 Gate valve J 54-inch dia. 1 each 7,500.00 7,500 Needle valve, 36-inch dia. 1 each 17,000.00 17,000 Pressure regulators 4 each 2,100,00 8,400 Venturi meter lump sum 4,100 Control house lump sum 5,000, $ 5a, 600 Reservoir Clearing reservoir lands 2,100 aCo 35.00 73,500 Road relocation (truck trails) lump sum 264,000 Access road, Pamo grade to dam lump sum 150,000 Caretaker's house and shop lump sum 20„000 507,500 Subtotal I 8,021,500 Administration and engineering, 10^ $ 802,200 Contingencies, 15^ 1,203,200 Real estate* 375,000 Subtotal $10,401,900 Interest during construction, l^% for one- -half of 2. 5 -year construction period 520,100 TOTAL $10,922,000 K=2U ESTIMATED COST OF PAMO "B" DAM AND RESERVOIR WITH STORAGE CAPACITY OF 163^400 ACRE-FEET (continued) s s Unit s Item g Quantity g price s Cost ANNUAL COSTS Interest, J,. 5% % 382,300 Amortization J 40=year sinking fund at 3o5^ 129,200 Operation and maintenance 16,300 TOTAL 527,800 * Detail costs of land, improvements^ and acquisition are presented in Table K-6„ TABLE K-12 K-25 ESTIMATED COST OF PAMO-MIRAMAR CONDUIT TO ACCOMPANY RESERVOIR OF 163,400 ACRE-FEEI CAPACITY (Based on prices prevailing in 1958) Length of conduit;, in niiless 24 Inside diameter of pipe, in inches; Design capacity of pipe, in second-feet s 34 Cross-sectional area of pipe, in square feet: 7«88 Average velocity, in feet 38 per seconds 4.33 Manning's value of "n": 0.0115 Hydraulic radius^ in feet: 0,792 Hydraulic slope , in feet per foot? 0.001525 % Unit Item i Quantity 5 price s Cost CAPITAL COSTS Excavation^, unclassified 353.,800 cu.yd. 1 1.20 $ 424,600 Backfill, compacted 27^900 cu.yd. 3.00 83,700 Backfill, consolidated 142,200 cu.yd. 0.75 106,700 Pipe, steel, mortar=lined. concrete coated, 38-inch loDo 10-gage ni,600 lin.ft. 16.95 1,891,600 8-gage 7,400 lin.ft. 17.85 132,100 3/16-inch 3A00 lin.ft. 19.25 59,700 1/4-inch 4,900 lin.ft. 22o55 110,500 Manhole 7 each 350.00 2,400 Manhole and air valve 43 each 510.00 21,900 Manhole and blowoff 26 each 590.00 15,300 Vent structure 20 each 650.00 13,000 Right of way lump sum 100,000 Subtotal • $2,961,500 Administration and engineering, 10^ 296,200 Contingencies „ 15^ 444,200 Interest during construction, 4^ for one-half of l-yeea » construction period 74.000 TOTAL $3,775,900 ANNUAL COSTS Interest, 3.5^ $ 132,200 Amoirtization, 40-year sinking fund at 3o5% 44,700 Operation and maintenance 3,800, TOTAL $ 180,700 TABLE K=13 ESTIMATED COST OF LAND AND IMPROVEMENTS FOR THREE SIZES OF DAM AND RESERVOIR AT THE SAN PASQUAL SITE ON SAN DIEGUITO RIVER IN SAW DIEGUITO RIVER WATERSHED Gross reservoir storage capacity, in acre-feet 100,000 220^000 33^,000 GENERAL FEATURES Water surface elevation for design flood, in feet, U.S.G.So datum U28 Land necessary for project, in acres Owned by City of San Diego Privately=owned 3,060 1,310 Totals i^,370 Number of privately- owned parcels 50 1^60 3,810 2,090 5,900 70 1+85 3,980 2zl90 6,570 75 CAPITAL COSTS Properxy owned by City of San Diego Land Improvements Privately-owned property Land Improvements Acquisition Subtotals Contingencies, 15?^ PROJECT TOTALS $l,2l<-7,000 ?i,ooo $1,598^000 $1,382,000 3 51 > OOP $1^ 733 > 000 $1,537,000 351 » 000 $1,888,000 587,000 475,000 50,000 1,112,000 $2,710,000 ^7,000 $3,117,000* 921,000 1,285,000 70 > 000 2,276,000 $1+, 009, coo 601,000 $i+, 610,000 l,02i+,000 1,285,000 75,000 2. 38^^.000 $i^, 272,000 6Ui,ooo $1^,913,000 ADDITIONAL COST TO CITY OF SAN DIEGO Pr ivat ely-owned property Contingencies, 15^ TOTALS $1,112,000 167,000 $1,279,000 $2,276,000 31^1,000 $2,617,000 $2,38i^,00C 357,00c $2,74l,00C * Value should be increased by the amount of $ljU33.5000 when San Pasqual ground water basin and San Pasqual surface reservoir are operated conjunctively,, K-27 TABLE K-lU ESTIMATED COSTS OF WELLS, PUMPING PLAMTS, AND CONVEYANCE FACULTIES FOR GROUND WATER DEVELOPMENT WITHIN SAN PASQUAL RESERVOIR AREA Maximum groiind water storage capacity utilized: 37^000 acre-feet Average depth to ground water at maximum basin depletion: 80 feet Item Quantity Unit price Cost CAPITAL COSTS Wells Drill, case, perforate, gravel pack and develop 13 new weDJLs, l6-in. diameter 2,360 lin.ft. $ 33.00 $ 77,900 $ 77,900 Pumps Deep well submersible, furnish and install 30 HP 50 HP 6 each 7 each 5,U00.00 6,100.00 32,hQ0 42,700 75,100 Pipe Steel, concrete coated, mortar lined, fxirnish and install 1 10- inch I.D., 12 gage 12-inch I.D., 12 gage 16-inch I.D., 1I2 gage 18-inch I.D., i2 gage 20- inch I.D., 12 gage 22-inch I.D., 12 gage 30-inch I.D., 10 gage Valves Lfenholes and Vents Earthwork Excavation Backfill, compacted Backfill, consolidated 6,300 lin.ft. 3.20 20,200 7,000 lin.ft. 3.90 27,300 3,300 lin.ft. 6.10 20,100 1,900 lin.ft. 6.80 12,900 2,500 lin.ft. 7.50 18,800 7,100 lin.ft. 8,50 60, 400 12,000 lin.ft. 12.20 lump svun 146,400 28,000 306,100 liomp sum 27,600 55,600 35,300 cu.yds. 0.^5 15,900 J+,100 cu.yds. 3.00 12,300 30,100 cu.yds. 0.75 22,600 50,800 ESTIMATED COSTS OF WELLS, PUMPING PLANTS, AND CONVEYANCE FACILITIES FOR GROUND WATER DEVELOPMENT WITHIN SAN PASQUAL RESERVOIR AREA (continued) Item I Quantity ; Unit ; ; price ; Cost CAPITAL COSTS Power Transmission Lines 5 "3 miles Transformers For 30 HP pumps 6 each For 50 HP pumps 7 each Service Road 2 miles 4, 000 00 l,500oOO 2, 000 00 7,150=00 $21,200 9,000 14,000 14, 300 $ 58,500 Subtotal $624,000 Administration and Engineering, 105^0 62,400 Contingencies, 15^ 93,600 Subtotal $780,000 Interest during construction, 4^ for one-half of 1-year construction period 15,600 TOTAL $795,600 ANNUAL COSTS Interest, 3.% $ 27,800 Amortization, iiO-year sinking fund at 3o5^ 9,400 Operation and maintenance 800 Electric energy for pumping 3,000 TOTAL $ 4l,000| K-29 TABLE K-15 JSTIMATED COST OF SAN PASQUAL DAM AS© RESERVOIR WITH STCRAGE CAPACITY OF 100,000 ACRE-FEET (Based on prices prevBlling in 1958) Elevation of crest of dam: 1+33 feet, U.S.G.So datvun Elevation of crest of spillway; ^+13 feet Height of dam to spillway crest, above stream beds 80 feet Capacity of reservoir to crest of spillway: 100,000 acre-feet Capacity of spillway with 5-foot freeboard: 123,300 second -feet ; Unit : Item Quantity : price : Cost CAPITAL CC6TS Dam Exploration lump sum $ 145,000 Diversion of stream and dewatering of foundation lump sum 100,000 Stripping topsoil Hi, 000 cu.yd. $ 0.35 15l+,n00 Excavation for embankment Foundation 778,000 cu.yd. 0,70 51414,600 Impervious from borrow pits 981,000 cu.yd. 0.35 3l^3,^0 Fmbankment Impervious 853,000 cu.yd. O0I5 128,000 Impervious, salvage ii-00,000 cu.yd. 0.20 80,000 Random, salvage I,2il7,300 cu.yd. 0.20 21+9, 500 Rock riprap 50,600 cu.yd. 2.1K) 121,1+00 Drilling grout holes 17, 280 lin.ft. i+.OO 69,100 Pressure grouting 15,260 cu.ft. 3.00 1+5,800 Gravel drains 118,700 cu.yd. 3.00 356,100 $ 2,237,300 Spillway Excavation, unclassified 1,998,800 cu.yd. 1.00 1,998,800 Backfill 12,250 cu.yd. 1.50 18,1+00 Rock riprap 5,ii70 cu.yd. 2.140 13,100 Concrete Weir and cutoff 2,710 cu.yd. 1^5.00 122,000 Floor 12,900 cu.yd. I4O.OO 516,000 Walls 1,730 cu.yd. 50.00 86, 500 Reinforcing steel l,Ul+5,700 lbs. 0.15 216,900 Drilling grout holes 7,200 lin.ft. i+.OO 28,800 Pressxire grouting U,800 cu.ft. 3.00 li+,1+00 3,0li+,SO0 Outlet Works Excavation Inlet and outlet structures 1,1+UO cu.yd. 2.00 2,900 Conduit 3,614-0 cu.yd. 1.50 5,500 Backfill 2,350 cu.yd. I+.50 10,600 K=-30 ESTIMATED COST OF SAN PASQUAL DAM AND RESERVOIR WITH STORAGE CAPACITY OF 100 .,000 ACRE^FEET (continued) o s Unit a Item ; QTiantity s price s Cost CAPITAL COSTS Outlet Works (continued) Concrete Pipe encasement 960 cuoyd. $50eOO $ U8,ooo Intake tower 630 euoyd,, 60„00 3 7 5,800 Reinforcing steel 207.200 IbSo 0«1$ 31pl00 Miscellaneous metalwork 16 p 500 lbs. 0oU5 T.iiOO Steel pipes 30-inch diaog intake tower lOpUOO IbSo 0.30 3 5, 100 Butterfly valves ^ 30=inch diaoj, intake 3 each ll5200,00 12,600 Steel pipe_o U8=inch diao nioUOO Ibsp Oo30 33s,U00 High pressure slide gate 1 each lump sum 15^,000 Gate valve,, l42=inch dia» 1 each lump sum 6^200 Venturi meter 1 each lump sum li,100 Control house 1 each lump stmi 5 ,,000 $ 222,700 Reservoir Clearing reservoir lands 2p925 aco 35oOO 102sU00 Relocation of utilities lump s-um 2814,000 Road relocation^ lump sum lc,000<,000 Access road lump sum 10 J, 000 Caretaker's house and shop Itimp sum 20,, 000 lsUl6,l;00 Subtotal $ 6,891,300 Administration and engineeringc, 10^ 689,100 Contingencies J, 1$% Ij, 033 5 700 Real estate^ . 3^117,000° Subtotal 111^731,100 Interest during cons true tion^, h% for one-half of 1-year construction period . 2 31 .,600 TOTAL $ll5 96$p700 ANNUAL COSTS Interest g 3o5/2 $ ia.8p800 Amortization^ UO=year sinking fund at 3o5^ l)|lp600 Operation and maintenance _ 12,500 TOTAL $ 572,000*^ Based on estimate contained in State Division of Highways' interdepartmental communication, dated March 7, 1956, presen^ed hereinafter in this appendix,, Detailed costs of land, improvements, and acquisitions are presented in Table K-13o Cost of real estate equals $U,550c,000 when San Pasqual ground water basin and San Pasqual surface reservoir are operated conjunctively » Value should be increased by the araoiint of $67,, 100 when San Pasqual ground water basin and San Pasqual surface reservoir are operated conjunctively. K-31 TABLE K-16 ESTIMATED COST OF SAN PASQUAl-MIRAMAR CONDUIT AND SAN PASQUAL RESERVOIR -LAKE HODGES CANAL TO ACCOMPANY RESERVOIR OF 100,000 ACRE-FEET CAPACITY AND GROUND WATER STORAGE DEPLETION OF 37,000 ACRE-FEET (Based on prices prevailing in 1958) Pipe Line from San Pasqual to Pxaiping Plant Length of conduit, in miles i oTB~ Inside diameter of pipe, in inches: 36 Design capacity of pipe, in second-feet '. 29 • 5 Cross-sectional area of pipe, in square feets 7=07 Average velocity, in feet per second: k„l'J Manning's value of "n": O.OII5 Hydraulic radius, in feet*. O.750 Hydraulic slope, in feet per foots 0.001533 Pipe Line from Pumping Plant to Miramar Length of conduit, in miles: 11.9 Inside diameter of pipe, in inches: 22 Design capacity of pipe, in second-feet: 7.9 Cross-sectional area of pipe, in square feet: 2,6k Average velocity, in feet per second: 2.99 Manning's value of "n": 0.011 5 Hydraulic radius, in feet: 0.4 58 Hydraulic slope, in feet per foot: 0.001 52 5 Canal from San Pasqual Pumping Plant to Lake Hodges Length of canal, in miles: 3«^ Bottom width, in feet: 3»0 Depth- of flow, in feet: I065 Design capacity of canal, in second-feet: 22.0 Cross-sectional area of canal, in square feet: 7.67 Average velocity, in feet per second: 2.9 Manning's value of "n"! 0.015 Hydraulic radius, in feet; Hydraulic slope, in feet per foot: O.OOO83 10 : ; Unit : Item : Quantity : price : Cost CAPITAL COSTS Pipe Line Excavation, unclassified 110, 500 cu.yd. $ 1.20 $ 133,000 Backfill, compacted 7,100 cu.ydo 3.00 21,300 Backfill, consolidated 60,900 cu.yd. 0.75 45,600 Manholes 5 each 200.00 1,000 Manhole and air valve 11 each 300.00 3,300 Manhole and blowoff 15 each iK)0o00 6,000 Vent structure 5 each U5O.OO 2,300 Pipe, steel, mortar-lined concrete-coated From San Pasqual Dam to pumping plant 36-inch I.D. 8 -gage l+,200 ft. 17.00 71,400 f ESTIMATED COST OF SAN PASQUAL-MIRAMAR CONDUIT AND SAN PASQUAL RESERVOIR -JuAKE HODGES CANAL TO ACCCMPANY RESERVOIR OF 100^000 ACRE-FEET CAPACITY AND GROUl'JD WATER STORAGE DEPLETION OF 37.»000 ACRE-FEET (continued) ; : Unit c Item s Quantity ', price : Cost CAPITAL COSTS From pumping plant to Miramar Reservoir 22"inch I.D: 12 -gage 56,U00 ft. $ 9«J+5 $ 553>ooo 10=gage 3,500 ft. 10-60 37,100 8-gs.ge 2,600 fto lie 10 28,900 $ 902,900 San Pasqual Reservoir to Lake Hodges Canal '1 Excavation 51,100 cu.yd. 0.45 23,000 Embankment 10,700 cu.yd. O.i+5 U,800 Trimming 21,000 sq.yd. 0,50 10, 500 Concrete lining 3A30 cu.yd. 28.00 87,600 Siphons and culverts = „ Itrnip sum 11, 500 Fencing, U=strand barbed wire 13.8 miles 2p700.00 37,300 17^^,700 Pumping Plant, 600 H,P, Cost of structure, pxunps, motors, electric equips ment and miscellaneous equipment, furnish and install Right of way Subtotal Administration and engineering, 10^ Contingencies, 15^ Subtotal Interest during construction, kf^ for one-half of 1-year construction period TOTAL lump sum 67,600 67,600 lump sum 55,000 55,000 $1,200,200 120,000 180,000 $1,500,200 -year 30,000 $1,530,200 \ ANNUAL COSTS Interest, 3 "5?^ Amortization, UC=year sinking fund at 3,5^0 Operation and maintenance Electric energy for pumping 53,600 18,100 20, 500 9,Uoo TOTAL $ 101,600 K-33 TABLE K-17 ESTIMATED COST OF SAN PASQUAL DAM Al© RESERVOIR WITH STORAGE CAPACITY OF 220,000 ACRE-FEET (Based on prices prevailing in 1958) Elevation of crest of dam: k6'^ feet, UoSoGoS. datum Elevation of crest of spillway; hk6 feet Height of dam to spillway crest, above stream bed: II3 feet Capacity of reservoir to crest of spillway: 220,000 acre-feet Capacity of spillway with 5 -foot freeboard: 115,600 second -feet * ; Unit Ite« : Quantity ; ; price : Cost CAPITAL COSTS Main Dam Exploration lump svmi $ 60,000 Diversion of stream and dewatering of foundation lump sum 100,000 Stripping topsoil 6i+9,000 cu«.yd. $ 0.35 227,200 Excavation for embankment Foundation 976,000 cu.yd. 0.70 683,200 Impervious from borrow pits 1,6U6,800 cu.yd. O.i+O 658,700 Random from stream bed l,Ul7,iK>0 cu.yd. O.ifO 567,000 Embankment Impervious 1,432,000 cu.ydo 0.15 2li+,800 Impervious, salvage ,21+9,000 cu.yd. 0.20 1+9^800 Random 1,232,500 cu.ydo 0.12 II+7, 900 Random, salvage 1,010,000 cu.yd. 0.20 202,000 Rock riprap 68,000 cu.yd. 2.U0 163,200 Drilling grout holes 18,800 lin.ft, l^,00 75,200 Pressure grouting 12,500 cu.ft. 3.00 37, 500 Gravel drains 178,000 cu.yd. 3.00 531^,000 $3,720,500 Auxiliary Dam. Stripping topsoil and excava- tion for foundation Embankment Impervious , salvage Random, salvage Gravel drain, salvage Rock riprap Drilling grout holes. Pressure grouting Gravel drains 62,000 cu.yd. 0.35 21,700 80,000 cu.yd. 0.20 16,000 81,800 cu.yd. 0.20 16,1+00 8,700 cu.yd. 3.00 26,100 10,200 cu.yd. 2.1*0 2I+, 500 13,800 lin.ft. i+.OO 55,200 9,200 cu.ft. 3.00 27,600 8,700, cu..yd. 3.00 26; 5.00 213,600 K=3li ESTIMATED COST OF SM PASQUAL DAM AHD RESERVOIR WITH STOFA^JE CAPACITY OP 220,000 ACRE-FEET (continued) CAPITAL COSTS Unit price Cost Spillway Excavation, unclassified Backfill Rock riprap Concrete Weir and cutoff Floor Walls Reinforcing steel Drilling grout holes Pressure grouting Outlet Works Excavation Inlet and outlet structures Conduit Backfill Concrete Pipe encasement Intake tower Reinforcing steel Miscellaneous metalwork Steel pipe, 36-iuch dia., intake tower Butterfly valves, 36-inch diao, intake tower Steel pipe, 66-inch dia. High pressure slide gate Gate valve, 66=inch dia. Venturi meter Control house Reservoir Clearing reservoir lands Relocation of utilities Road relocation^ Access road Caretaker's house and shop Subtotal 1*393^)000 cu.yd. $ 1,00 7,,600 cuoydo 1,50 i+,670 cu.yd. 2A0 2,800 Clio yd o k^oOd 23,290 cu.ydo UOoOO 4pi)-10 cu.ydo 50.00 2,536,500 IbSo 0,15 7,200 linofto 4o00 4,800 cucft. 3o00 1,900 cUoydo 6,1+00 cuoyd. 4,100 cu.ydo 1,650 cu«yd» 850 cu.yd. 325,000 lbs. 32,000 lbs, 15>500 lbs. h each 275,700 lbs. 1 each 1 each 1 each 1 each 2=00 1.50 U.50 50.00 60.00 0,15 0.45 0.30 5,600.00 0.30 lump sum lump sum lump S'um lump sum 4,300 ac< 35oOO lump sum lump sum lump sum lump sum $1,393,000 11,400 11,200 126,000 931,600 220,500 380, 500 28,800 14, 400 3,800 9,600 18,500 82,500 51,000 48,800 14, 400 4,700 22,400 82,700 32,000 10,500 5,000 5,000 150, 500 280,000 1,000,000 10,000 20,000 $3,117,400 390,900 1,460,500 $8, 902, 900 ' ESTIMATED COST OF SAN PASQUAL DAM AND RESERVOIR WITH STORAGE CAPACITY OF 220,000 ACRE-FEET (continued) K-35 Item Quantity Unit price Cost CAPITAL COSTS Administration and engineering, 10^ Contingencies, 15^ Real estate^ Subtotal Interest during construction, k*^ for one-half of 2-year construction period TOTAL $ 890,300 1,335,^+00 U, 610,000 $15,738,600 629, 300 $16,368,100 ANNUAL COSTS I Interest, 3,5^ Amortization, iK)-year sinking fund at 3*5?^ Operation and maintenance TOTAL $ 572,900 193,600 19,700 $ 786,200 a. Based on estimate contained t is, .St^t© iDiyiqiQni.ffiX.iHighwayg' inter-departmental conuounication, dated March 7, 1956, presented hereinsifter in this appendix. b. Detail costs of land, improvements, and acquisition are presented in Table K=13, K=36 TABLE K-18 ESTIMATED COST OF SAN PASQUAI -MIRAMAR CONDUIT AND SAN PASQUAL RESERVOIR -LAKE HODGES CANAL TO ACCOMPANY RESERVOIR OF 220,000 ACRE-FEET CAPACITY AND GROUND WATER STORAGE DEPJJETION OF 37,000 ACRE-FEET (Based on prices prevailing in 1958) Pipe Line from San Pasqual to Pumping Plant Length of conduit, in miles* -B"^ Inside diameter of pipe, in inchest kO Design capacity of pipe^ in second -feet : UO Cross -sectional area of pipe, in square feet; 8,73 Average velocity, in feet per second; k.S Manning's value of "n"; 0^0115 Hydraulic radius, in feet; O.832 Hydraulic slope, in feet per foot- 0.001618 Pipe Line from Pumping Plant to Miramar Length of conduit, in miles; 11-9 Inside diameter of pipe, in inches; 30 Design capacity of pipe, in second -feet; I6.I Cross -sectional area of pipej in square feet: h,% Average velocity, in feet per second; 3 '69 Manning's value of "n" ; O.OII5 Hydraulic radius, in feet; O.625 H;i'di-aulic slope, In feet per foot; 0,001525 Canal from San Pasqual Pumping Plant to Lake Hodges Length of canal, in miles rjx Average velocity, in feet Bottom width,, in feet; ; 3.0 per s' scond ; 2-9 Depth of flow, in feet: 1 .65 Manning 's value of " n"; 0,015 Design capacity of canal. in Hydraulic radius, in feet; 1.0 second-feet; 22.0 Hydraulic slope, in feet Cross -.oectional area of a anal , in per foot; 0,00083 square feet; 7^67 or' .t'n ; ; Unit ; Item 1 Quantity ; price ; Cost CAPITAL COSTS Pipe Line Excavation, unclassified 127,900 cu-yd. $ 1.20 $ 153.500 Backfill, compacted 11,200 cu.yd. 3-00 33,600 Backfill; consolidated 61,000 cu.yd. 0.75 U6,ooo Manholes 5 each 250.00 1,300 Manhole and air valve 11 each 350.00 3,^00 Manhole and blowoff 15 each 1+50 00 6,800 Vent structure 5 each 500=00 2,500 Pipe, steel, mortar-lined concrete coated From San Fasqual Dam to pumping plant iiO-inch I-D, 8 "gage l|-,200 ft. 18.80 75,000 ESTIMATED COGT OF SAN PASQUAL-KIR/SMAR CONDUIT Ai'ID BAIT FASQUAL RERI'IWOre-LAKli; IIODC-ES CANAT. TO ACCOMPANY RESERVOIR OF 220,000 ACRE-FEET CAI'ACITY AND GROUND VJATKR STORAGE DEPLETION OF 37^000 ACRE-FEET (continued) K-37 Item Quantity Unit Price Cost CAPI'I'AL COSTS From pumping p].ant to Miramar Reservoir 30-inch I.D. 10 -gage 56, 500 ft. 13-20 .') 7^15,800 8 -gage 2,S00 ft. 13.90 Uo,300 3/16-inch 1,500 ft. lU.c;5 22,U00 l/l+-inch 1,600 ft. 17.60 28,200 ;i;i,i63 300 San Pasqual Reservoir to Lake Hodges Canal Excavation 51,100 cu . yd . 0.i^5 23,000 Embankment 10,700 cu , yd . 0.U5 ii,8oo Trimming 21,000 sq.yd. 0.50 10, 500 Concrete lining 3,130 cu . yd , 28.00 87,600 Siphons and culverts -- lump sum 11,500 Fencing, U-strand barbed vire 13-8 miles 2, 700.00 37,300 17^1 700 uniping Plant, 1,250 H.P. Cost of ^trvi.cture, puriips, motors, electric equip - ri^ent and miscellaneous equipment, furnish and j.nstall lump sum Right of -::ai/ lump siua Subtotal Administration and engineering, 10^' Contingencies, 15*;' Subtotal Interest during construction, h°^ for one-half of 1-year con;;truction period TOTAL 1311,000 13l;,000 55,000 _ 55^000 ijjl, 527,000 152,700 229,000 .';^1,S08,700 38,200 $l,f;ii6,500 AL:I.WJ. COSTS Iirterest, 3-5r Amortization, l^O-year sinking fund at 3 ■ 5^' Operating and maintenance Electric energy for pumping $ 68,100 23,000 23 . 700 2 '7j800 TOTAL lli2,600 K-38 TABLE K-19 ESTBiATED COST OF SAN PASQUAL DAM AND RESERVOIR WITH STORAGE CAPACITY OF 335,000 ACRE-FEET ' (Based on prices prevailing in 1958) ^ i Elevation of crest of dam; ^90 feet. Capacity of reservoir to crest of UoS.G.So datum spillway; 335,000 acre-feet Elevation of crest of spillway; U70 feet Capacity of spillway with 6-foot Height of dam to spillway crest, above freeboards 111,800 second -feet stream bed; I37 feet ; ; Unit ; Item s Quantity ; ^rice % Cost CAPITAL COSTS ^' Main Dam ■.t Exploration lump sum $ 70,000 ; Diversion of stream and ' dewatering of foundation lump sum 100,000 Stripping topsoil 7^1,000 cuoydo $ 0.35 259,^00 Excavation for embankment Foundation l,207,itOO cuoydo 0.70 845,200 Impervious from borrow pits 2,660,000 cuoydo O0I15 1,197,000 Random from stream bed and borrow pits 2,6U2,600 cu.ydo O.U5 1,189,200 Embankment Impervious 2,309,700 cu.yd. O0I5 346, 500 Impervious J salvage 131,000 cu,yi. 0.20 26,200 Random 2,298,000 cu.ydo 0.12 275,800 Random, salvage 6it8,300 cuoydo 0.20 129,700 Rock riprap 93,100 cu.ydo 2.40 223,400 Drilling grout holes 20,500 linoft 4,00 82,000 Pressure grouting 13 > 700 CU.fto 3oOO 41,100 Gravel drains 242,600 cu.ydo 3»00 727,800 $ 5,513,30c Auxiliary Dams Stripping topsoil and excavation for foundation Excavation for embankment Impervious from borrow pits Random from stream bed Embankment Impervious Impervious, salvage Random Rock riprap Drilling grout holes Pressure grouting Gravel drains 219,700 cuoyd. 0,35 76,900 216,900 cu.ydo 0.45 97,600 345,900 cu.yd. 0,45 155,700 364,400 cUoyd, 0.15 54,700 175,800 cu.yd. 0.20 35,200 125,000 cu.ydo 0.12 15,000 31,900 cu.ydo 2o80 89,300 31,400 linoft. 4.00 125,600 21,000 cu.ft. 3o00 63,000 61,500 cu.ydo 3 '00 184, 500 897,500 K-39 ESTIMATED COST OF SM PASQUAL DAM AND RESERVOIR WITH STORAGE CAPACITY OF 33 5,000 ACRE- -i-'lilWi' (continued) • : Unit a Item °. Quantity : price : Cost CAPITAL COSTS . Spillway Excavation, unclassified 657,800 cu.yd. $ 1.50 $ 986,700 . Backfill 16,700 cu.yd. 1.50 25,100 Rock riprap 5,3itO cu.yd. 2.40 12,800 Concrete Weir and cutoff 2,690 cu.yd* U5-00 121,100 Floor 22,0^40 cu.yd. i+0.00 881,600 Walls 5,J+00 cu.yd. 50.00 270,000 Reinforcing steel 2,601,300 lbs. 0.15 390,200 Drilling grout holes 7^200 lin.ft u.oo 28,800 Pressure grouting U,800 cu.ft. 3-00 14,U00 $ 2,730,700 Outlet Works ■ Excavation Inlet and outlet structures 2,200 cu.yd. 2.00 l^,i+00 Conduit 12,100 cu.yd. 1.50 16,200 Backfill 7,600 cu.yd. k.30 3i+,200 Concrete Pipe encasement 3,380 cu.yd. 50.00 169,000 Intake tower 1,050 cu.yd. 60.00 63,000 Reinforcing steel 577,000 lbs. 0.15 86,600 Miscellaneous metalwork 1^5,000 lbs. 0.i^5 20,300 Steel pipe, U2=inch dia.. intake tower 19,500 lbs. 0,30 5,800 Butterfly valves, i*^2=inch dia. 5 each 7,200.00 36,000 Steel pipes, 60-inch dia. (2) 556,700 lbs. 0.30 167,000 High pressure slide gates 2 each lump sum 57,000 Gate valves, 60-inch diai 2 each 9,000.00 18,000 Venturi meter 1 each lump stun 6,000 Control house 1 each lump sum 5,000 690,500 Reservoir Clearing reservoir lands 5,000 ac. 35.00 175,000 Relocation of utilities lump sum 280,000 Road relocation^ lump sum 1,000,000 Access road Ivanp sum 10,000 Caretaker's house and shop liomp sum 20,000 1,1+85,000 Subtotal $11,317,000 ESTIMATED COST OF SAN PASQUAL DAM AND RESEKVOIR WITH STCRAGE CAPACITY OF 33 5 j> 000 ACRE=*FEET (continued) CAPITAL COSTS s i Unit g Item ; Quantity ; price s Cost Administration and engineering, 10^ $ 1,131,700 Contingencies, 13i> l,697,6O0 Real estate^ U, 913,000 Subtotal $19>059,300 Interest during construction, k'^ for ■ one-half of 2o5=year construction period 9^3,000 TOTAL ANNUAL COSTS Interest, 3.5^ Amortization, i+O-year sinking fund at 3° 5^ Operation and maintenance TOTAL $ 963,700 So Bdsed on Estimate contained in State Divisicn Of Highways" inter-departmental coMiminication, dated March 7j 1956, presented hereinafter in this appendix. bo Detail costs of land, improvements j, and acquisition are presented in Table K=13. I K-m TABLE K"^Q ESTIMATED COST OF SAN PASQUAL -MIR AMAH CONDUIT AND SAN PASQUAL RESERVOIR- 1 AKE HODGES CAI\iAL TO ACCOMPANY KESERVOIR OF 33^,000 ACRE-FECT CAPACITY AND GROUND WATER STORAGE DEPLETION OP 37,000 ACRE-FEET (Based on prices prevailing in 195^) Pipe Line from San Pasqual to Pumping Plant Length of conduit, in miles; 6.8 Inside diameter of pipe, in inghes ; hk Design capacity of pipe, in second-feet: 51? Cross -sectional area of pipe, in square feet: 10.6 Average velocity, in feet per second: ^.9 Maiiidng's value of "n": 0,0115 Hydraulic r^idius, in feett O.918 Hydraulic slop^, in f^et per foot: 0.001618 £.^ p e L i ne from Pump in g Pl ant . tO' Miramar Length of conduit, in miles; 11. 9 Inside diameter of pipe, in inches; 36 Design capacity of pipe, in second=feet,; 29»^^ Cross-sectional area of pipe, in square feet; 7.07 Average velocity^ in feet per second: U.16 Manning's value of "n": O.OII5 H^'riraulic radius, in feet: O.75O Hydraulic slope, in feet per foot: 0.001 52 5 Canal from San Pasqual Puinping Plant to Lake H odges Length of canal, in miles: 3IU Average velpcity, in feet Bottom width, in feet: 3.0 Depth of flow, in feet; 1<,65 Design capacity of canal, in second-feet; 22.0 Cross -sectional area of canal, square feet: 7 '67 "n"; in per second: 2.9 Manning's value of Hyaraulic radius, in feet Hydraulic slope, in feet per foot: 0>00083 0»015 loO Item Quantity Urtit Price Cost CAPITAL COSTS Pipe Line Excavation, unclassified Backfill, compacted Backfill, consolidated Manholes Manhole and air valve Manhole and blowoff Vent structure Pipe, steel, mortar-lined, concrete coated From San Pasqual Dam to pumping plant l|l|>inch I.D. 8-gage 11+5,200 cU.yd. $ 1,20 $ 171^,200 11,900 cu.yd 3.00 31^,200 69,000 cu.yd. 0.75 51,700 5 each 325.00 1,600 11 each i+90.00 5,U00 15 each 570.00 8,600 5 each 630.00 3,200 U,200 ft. 20.60 86,500 ESTIMATED COST CF SAN PASQUAL-MIRAJ4AR CONDUIT AliD SAN PAGQU/X. RESERVOIR^ LAKE HODGES CANAL TO ACCCMPAWY RESFRVOIR OF 335>000 ACRE-FEET CAi^AClTY AND GROUND WATER STORAGE DEPLETION OF 37; 000 ACRE-FEET (continued.' ; : Unit : Item : Quantity : Price ; Cost CAPITAL COSTS From pumping plant to Kiramar Reservoir 36- inch LP- IC-gage 54,500 ft. $ 16.50 $ 899,300 8-gage 2,U00 ft. 17.00 ito,8oo 3/l6"inch 2,100 ft. 18.30 38, llOO lA=inch 3,500 ft. 21,25 7U,l+00 ;il,itl8,300 San Pasquai Reservoir to Lake Hodges Canal Excavation 51,100 cu.yd. 0,U5 23,000 Embankment 10,700 cu-.yd. 0.45 U,8oo Trimming 21,000 sq.yd. 0.50 10,500 Concrete lining 3,130 cu.yd. 28.00 87,600 Siphons and culverts — lump sum 11,500 Fencing, U-strand barbed wire 13.8 miles 2,700.00 37,300 174,700 I\imping Plant, 2,000 H.P. Cost of structure, pumps, motors., electric equip- ment and miscellaneous equipment, furnish and install lump sum Right of way lump sum Subtotal Administration and engineering, 10^ Contingencies J 15^ Subtotal '"ntrtPGt during construction, k^o for one-half of 1-year confjti \«ction period TO^'AX 189, 500 189, 500 55,000 55,000 $1,837,500 183,800 275,700 $2,297,000 ^5,900 $2,342,900 ANNUAL CO£-TS Inttirest, 3-5'/'^ Amortization, ^O-year sinking fund at 3<5^ Operating and maintenance Electric energy for pumping 82,000 27,700 26,900 84,400 TJTjiL $ 221,000 TABLE K-21 ESTIMATED COST OF LAND AND IMPROVElvffillTS FOR THREE SIZES OF I)A14 Am RESERVOIR AT THE SUPER HODGES SITE ON SAN DIEGUITO RIVER IN SAN DIEGUITO RIVER WATERSHED K.1+3 Gross reservoir storage capacity^ in acre -feet GENERAL FEATURES Totals Number of privately- owned parcels CAPITAL COSTS Property owned by City of San Diego Land Improvements Privately -owned property Land Improvement s Acquisition 157,300 Water surface elevation for design flood, in feet, U=S«G.S. datura 383 Land necessary for project, in acres Owned by City of San Diego 6,680 Privately -owned 200 6; 157 310,000 363,000 $2,281+, 000 193,000 $2,ii77,ooo U68,000 8i+l,000 137,000 1,^66,000 Subtotals Contingencies, 15^ PROJECT TOTALS $3,9^3,000 391; OOP $i|, 53^,000 412 7,7^0 1,320 9,260 220 J;l9 8,100 1,990 10,090 250 $3,188,000 2^3,000 $3,U31,000 700,000 1,083,000 220,000 2,003,000 $3,^3^,000 813,000 $6,21+9,000 $3, '+75,000 21+3,000 $3,718,000 763,000 1,283,000 230,000 2,296,000 $6,oiii,ooo 902,000 $6,916,000 ADDITIONAL COST TO CITY OF SAIJ DIEGO Pri vat e ly -owne d property Contingencies, 13^ $l,i+66,000 220,000 $2,003,000 300,000 $2,296,000 3l+l+,000 TOTALS $1,686,000 $2,303,000 $2,61+0,000 K-UU TABLE K-22 ESTIMATED COST. OF RELOCATING HIGHWAYS FOR THREE SIZES OF DAM, AND RESEP.VOIR AT THE SUPER HODGES SITE^ 5 Gross reservoir storage capacity^ 8 in acre-feet t 1 57.300 t 310,000 s 36$, 000 Water surface ele- vation for design flood, in feet, UoS,G,S, datum 383 ia2 I4I9 PROJECT COSTS U. S. Highway No« 39$ Roadway and right of way, h lanes $2,7U7,000 $3,6U$,000 $3,886,000 Structures 1,813,000 $[4, $90,000 7,288,000 $10,933,000 T, 288, 000 $ll,17li,00 State Sign Route No> 78 Roadway and right of way, 2 lanes 67,000 i;73,000 8$1,000 Structures — 67,000 $0,000 $23,000 60,000 911, C J Subtotals $ii,6$7,000 $ll,i;$6,000 $12,08$,0CJ Engineering and admin- istration, 1056 146$, 700 1,1U$,600 1,208,$C | T0TAI5 $$,122,700 $12,601,600 $13,293,$^} COSTS TO THE CITY OF SAN DIEGO Uo S, Highway Noc 39$ Roadway and right of wayj 2 lanes $ljOW4,000 $1,38$,000 $1,U77,000 Structures 1,198,000 $2,2U2,000 U, 737,000 $ 6,122,000 U, 737,000 $ 6,2lU,0()l. h State Sign Route No, 78 67,000 $23,000 911,0( ||, Subtotals $2,309,000 $ 6,6l4$,000 $ 7,12$,0(| Engineering and adminis- tration, 10$ 231,000 66$, 000 713, < TOTALS $2,$U0,000 $ 7,310,000 $ 7,838,0| * Based on data presented in inter-departmental communication from Division of Highways dated May 6, 1958, and data presented in Right of Way Contract be- tween California State Division of Highways and the City of San Diego, dated May 27, 19$U, which are included in another portion of this appendix. K-U5 TABLE K-23 ESTIMATED COST OF SUPER HODGES DAM AND RESERVOIR WITH STORAGE CAPACITY OF 157 .,300 ACRE-FEET (Based on prices prevailing in 1958) Elevation of crest of dam; 38i^ feet, U.S.Ct.So datxan Elevation of crest of spillway: 365 feet Height of dam to spillway crest^ above stream bed: I65 feet Capacity of resefvolr to crest of spillway: 157,300 acre-feet Capacity of spillway with 1-foot freeboard: 115,000 second -feet • • : Unit • • Item : Quantity : price .: Cost CAPITAL COSTS Dam (Including spillway) Exploration Itmip sum $ U5,000 Diversion of flow and dewatering of foundation lump sum 25,000 Excavation of foundation 108, 500 cu.yd. $ 3.50 379,800 Concrete Mass 296,900 cu.yd. 18.50 5,492,600 Cooling 296,900 cu.yd. 0.50 li»8,500 Spillway training walls ■ and piers l,ifl0 cu.yd. 50.00 70,500 Bridge and parapet wails 620 cu,. yd . 60.00 37,200 Reinforcing steel 189,000 Ibso 0.15 28,1400 Pressure grouting 8,900 cu.ft. 3.00 26,700 Drilling grout holes and drains 16,200 lin.ft V.OO 64,800 $ 6,318,500 Outlet Works Reinforced concrete 10 cu.yd. 50.00 500 Trash rack steel 6,600 lbs. 0.15 1,000 Steel pipej, 30-inch dia. 24,200 lbs. 0.30 7,300 Gate valves, 30-inch dia. 5 each 3,500.00 17,500 Hi^ pressTore slide gate 3 each 13,500.00 40,500 Needle valve and energy dissipa-tor 1 each 11,000.00 11,000 Miscellaneous metalwork 207,800 lbs. O.U5 93, 500 Reinforcing steel 8,700 lbs. 0.15 1,300 Control houte l\amp svm 5,000 177,600 Reservoir Clearing reservoir lands ^050 ac. 35.00 l4i,8oo Relocation of utilities lump sum 337,500 Access roads lump sum 7,500 486,800 Subtotal $ 6,982,900 K=U6 ESTIMATED COST OF SUPER HODGES DAM AND RESERVOIR WITH STCHAGE CAPACITY OF 157^300 ACRE-FEET (continued) CAPITAL COSTS Administration and engineering, 10^ Contingencies, 15?^ Real estate, land, and improvements®' Relocation of state highway'' Subtotal Interest during construction, k'^ for one -half of 2 -year construction period TOTAL AJINUAL COSTS Interest, 3.5^ Amortization, UO-year sinking fund at 3-5?^ Operation and maintenance TOTAL i $ 698,300 l,0U7,lKX) U, 53U,ooo ^,122,700 $18,385,300 735^^0 $19,120,700 $ 669,200 226,200 15,900 $ 911,300 a. Detail costs of landn improvements, and acquisition are presented in Table K=21. b. Detail costs of state highway relocation are presented in Table K=52» K-h7 TABLE K-2i; ESTIMATED COST OF SUPER HODGES *MIRAMAR CONDUIT TO ACCOMPANY RESERVOIR OF 1^7,300 ACRE-FEET CAPACITY (Based on prices prevailing in 1958) Length of conduit^ in miles: 10«ii Inside diameter of pipe, in inches: 20 Design capacity of pipe, in second-feets 6.3 Cross -sectional area of pipe, in square feett 2<,l8 Average velocity, in feet per second: 2,9 Manning' s value of "n" : 0, Hydraulic radius, in feet: Hydraulic L.lope, in feet per foot: 0,0016 0115 0.U17 * • : Unit : Item : Quantity : Price : Cost CAPITAL COSTS Pipe Line Excavation, unclassified 102,200 cu. yd. 1 1,20 $ 122,600 Backfill, compacted 5,500 cu. yd. 3.00 16,500 Backfill, consolidated l4l,000 cu, yd. 0,75 30,800 Manholes 11 each 2h0.00 2,600 Manhole and air valve 18 each 300.00 5,Uoo Manhole and blowoff 19 each 330.00 6,300 Vent structure 2 each 360,00 700 Pipe, steel, mortar-lined. concrete coated, 20-inch 1,0, 12-gage 53,500 lin,ft. 7.50 Uoi,30o 10-gage 900 lin.ft. 8.35 7,500 8-gage 500 lin,ft. 8.90 U,5oo $ 598,200 Pumping Plants Cost of structure, pumps, motors, electric equip- ment and miscellaneous equipment, furnish and install Plant No, 1 - iiOO H.P, Plant No. 2 - 250 H.P. Right of way Subtotal l\imp sum lump sum lump STjm U0,300 3U.300 50,000 7U,600 50,000 722,800 I K-U6 ESTIMATED COST OF SUPER HODGES -MIRAMAR CONDUIT TO ACCOMPANY RESERVOIR OF l$7j,300 ACRE=.FEET CAPACITY (continued) Item I Quantity t Price t Cost Administration and engineeringj 10^ $ 72,300 Contingencies J, 1S% 108,1;00 Subtotal $ 903,500 Interest during construction, k% for one-half of l=year construction period I8 , 100 TOTAL $ 921,600 ANNUAL COSTS Interests 3o^% $ 32,300 Amortizations, UO-year sinking fund at 3o$% 10,900 Operation and maintenance 15,800 Electric energy for pumping " 8,000 TOTAL $ 67,000 ^pIW^ K-U9 TABLE K-2$ ESTIMATED COST OF SUPER HODGES DAM AND RESERVOIR WITH STORAGE CAPACITY OF 310,000 ACRE-FEET (Based on prices prevailing in 195^) Elevation of crest of dam: iH3 feet, U.SoG.So datum Elevation of crest of spillway: 395 feet Height of dam to spillway crest, above stream bed: 195 feet Capacity of reservoir to crest of spillway: 310,000 acre-feet Capacity of spillway with 1-foot freeboard: 102,000 second-feet Item Quantity Unit price Cost CAPITAL COSTS Dam (including spillway) Exploration lump svim $ 50,000 Diversion of flow and dewatering of foundation lump sum 25,000 Excavation of foundation 126,600 cu.yd. $ 3.50 443,100 Concrete Mass 411,200 cu.yd. 18.50 7,607,200 Cooling 411,200 cu.yd. 0.50 205,600 Spillway training walls and piers 1,330 cu.yd. 50.00 66, 500 Bridge and parapet walls 670 cu.yd. 60.00 40,200 Reinforcing steel 200,400 lbs. 0.15 30,100 Pressure grouting 9,700 cu.ft. 3.00 29,100 Drilling grout holes and drains 17,600 lin.ft 4.00 70,400 $ 8,567,200 Outlet Works Reinforced concrete 10 cu.yd. 50.00 500 Trash rack steel 14,800 lbs. 0.15 2,200 Steel pipe, 42-inch dia. 41,500 lbs. 0.30 12,500 Gate valves, 42-inch dia. 6 each 5,100.00 30,600 High pressiore slide gates 150,000 lbs. 0.50 75,000 Needle valve and energy dissipator 1 each 22,000.00 22,000 , Miscellaneous metalwork 287,800 lbs. 0.45 129, 500 Reinforcing steel 13,350 lbs. 0.15 2,000 Control house lump sum 5,000 279,300 Reservoir 1 Clearing reservoir lands 6,200 ac. 35.00 217,000 Relocation of utilities Ivmp sum 334, 500 Access roads lump sum 1,000 552,500 s Subtotal $ 9,399,000 K-50 ESTIM^.TSD COST OF SUPER HODGES DAM AM) RESERVOIR WITH STORAGE CAPACITY OF 310,000 ACRE-FEET (continued) Unit : Item ; Qua ntity ; price ; Cost CAPITAL COSTS <■> Administration and engineering, 10^ $ 939,900 Contingencies, 1% 1,^09,900 P.eal estE'.te;, land, and improvejnents®- 6,2^9,000 Relocation of state highways 12,601,600 Subtotal $30,599,^+00 Interest during constnaction, ^i-^ for one-half of 3-year construction period 1,836,000 TOTAL $32,^35,1+00 AJMUAL COSTS Interest, 3.5^ $ 1,135,200 Amortization, 40-year sinking fund at 3.5^ 383,700 Operation and maintenance 25,100 TOTAL $ 1, 5l+U,000 a. Detail costs of land, improvements, and acquisition sore presented in Table K-21„ b. Detail costs of state highway relocation are presented in Table K-22o K-51 TABLE K-26 ESTIMATED COST OF SUPER HODGES -MIRAMAR CONDUIT TO ACCOMPANY RESERVOIR OF 310,000 ACRE-FEET CAPACITY (Based on prices prevailing in 1958) Length of conduitj in miles? 10. U Inside diameter of pipe, in inches: Design capacity of pipe, in second-feet s 13 o5 :Cross=sectional area of pipe, in square feet; 3o68 26 Average velocity, in feet per second: 3o66 Manning's value of "n" : 0.0115 Hydraulic radius, in feet: 0,5U2 Hydraulic slope, in feet per foot: O.OOlBU Item Quantity : Unit : Price Cost CAPITAL COSTS iPipe Line Excavation, unclassified 113,1100 cu. yd. $ 1,20 $136,100 Backfill, compacted 8,200 cu. yd. 3,00 2U,600 Backfillj, consolidated U6,300 cu. yd. 0.75 3ii,700 Manholes 11 each 21IO.OO 2,600 Manhole and air valve 18 each 320.00 5,800 Manhole and blowoff 19 each 380.00 7,200 Vent structure 2 each U50.00 900 Pipe, steel, mortar-lined. concrete coated, 26-inch I.D. 10"gage 53,300 lin.ft. 11.35 605,000 8-gage 700 lin.ft. 12.10 8,500 3/l6-=inch 700 lin.ft. 13.10 9,200 t 83U,600 Pumping Plants Cost of structures, ptpips, motors, electric equip- ment and miscellaneous equipment, furnish and install Plant No, 1 » 850 H.P. Plant No, 2 = 6OO H.P. Right of way Subtotal Ixsmp sum Ixmvp sum 78,500 62,000 lliO,500 lump sum 50,000 50,000 $1,025,100 K=52 ESTIMATED COST OF SUPER HODGES -MIRA.MAR CONDUIT TO ACCOMPANY RESERVOIR OF 310 ,000 ACRE=FEET CAPACITY (continued) § t Unit s Itan _______.^ L Quantity g Price g Cost Administration and engineerings lOjS $ 102 j, 500 Contingencies,, l5/K 153^800 Subtotal $1,281,1400 Interest diiring constnictiorio k% for one=half of 1-year construction period 25,600 TOTAL $1,307,000 ANNUAL COSTS Interest „ 3o5^ Amortization^ UO^year sinking fund at 3o5$ Operation and maintenance Electric energy for pumping TOTAL U5,70o 15 J 500 21,300 2-9,100 m,6nn K-53 TABLE K- 27 ESTIMATED COST OF SUPER HODGES DAM AND RESERVOIR WITH STORAGE CAPACITY OF 365,000 ACRE-FEET (Based on prices prevailing in 195^) Elevation of crest of dam: i+20 feet, UcSoG.So dat-um Elevation of crest of spillway; ^403 feet Height of dam to spillway crest, above stream beds 203 feet Capacity of reservoir to crest of spillway: 365^000 acre-feet Capacity of spillway with 1-foot freeboard: 92,800 second-feet : Unit : Item : Quantity : price : Cost CAPITAL COSTS Dam (Including spillway) Exploration lump sum ! ^ 50,000 Diversion of flow and dewatering of foundation lump sum 25,000 Excavation of foundation 133,100 cu.yd. $ 3.50 465, 900 Concrete Mass 460,200 cu.yd. 18.50 8,513,700 Cooling 460,200 cu.yd. 0.50 230,100 Spillway training walls and piers 1,330 cu.yd. 50.00 66,500 Bridge and parapet walls 670 cu.yd. 60.00 40,200 Reinforcing steel 200,400 lbs. 0.15 30,100 Pressure grouting 10,400 cu.ft. 3.00 31,200 Drilling grout holes and drains 18,700 lin.ft 4.00 74,800 $ 9,527,500 Outlet Works Reinforced concrete 10 cu.yd. 50.00 500 Trash rack steel 14,800 lbs. 0.15 2,200 Steel pipe, 48-inch dia. 62,200 lbs. 0.30 18,700 Gate valves, 48-inch dia. 6 each 6,000.00 36,000 - High pressure slide gates 3 each 25,000.00 75,000 Needle valve and energy dissipator 1 each 30,000.00 30,000 Miscellaneous metalwork 322,100 lbs. 0.45 144, 900 Reinforcing steel 13,350 lbs. 0.15 2,000 Control house lump sum 5,000 314,300 Reservoir Clearing reservoir lands 6,950 ac. 35.00 243,300 Relocation of utilities lump sum 337, 500 Relocation of county roads Ixanp sum 79,500 Access roads lump STom 1,^ 662,200 Subtotal $10,504,000 K-5ii ESTIMATED COST OF SUPER HODGES DAM AJND RESERVOIR WITH STORAGE CAPACITY OF 365,000 ACRE-FEET (continued) : : Unit : Item ; Quantity ; price : Cost ^_ CAPITAL COSTS Administration and engineering, 10^ $ 1,050, UOO Contingencies, 15^ 1,575,600 Real estate, land and improve- ments^ 6,916,000 Relocation of state highway 13^293,500 Subtotal $33,339,500 Interest during construction, U^ for one-iialf of 3 -year construction period 2,000,400 TOTAL $35,339,900 AHIUAL COSTS Interest, 3.5^ $ 1,236,900 Amortization, to-year sinking fund at 3 '5^ ^4-18,100 Operation and maintenance 28,U00 TOTAL $ l,683,i400 ao Detail costs of land, improvements, and acquisition sure presented in Table K=21o b. Detail costs of state highway relocation are presented in Table K-22. K-$5 TABLE K-28 ESTIMATED COST OF SUPER HODGES -MIRAMAJl CONDUIT TO ACCOMPANY RESERVOIR OF 365,000 ACRE-FEET CAPACITY (Based on pricee prevailing in 1958) Length of conduit, in miles s lOoU Inside diameter of pipe, in inchest Design capacity of pipe, in second-feet s 18 oO Cross-sectional area of pipe, in square feets Uo3 28 Average velocity, in feet per second: It<,2 Manning's value of "n"r 0,0115 Hydraulic radius, in feet: 0o583 Hydraulic slope, in feet per foots 0,0022 Item Quantity t Unit t Price Cost CAPITAL COSTS Pipe Line Excavation, unclassified Backfill, compacted Backfill, consolidated Manholes Manhole and air valve Manhole and blowoff Vent structure Pipe, steel, mortar-lined, concrete coated, 28-inch loD. 10-gage 8 -gage 3/16-inch l/U-inch P-umping Plants Cost of structures, pumps, motors, electric equip- ment and miscellaneous equipment, furnish and install Plant No. 1 - 950 H,P, Plant No. 2 - 650 H.P, Right of way Subtotal 121,600 cu. ydo $ 1,20 $lh5,900 8,300 cu. yd. 3.00 2U,900 U6,700 cu, yd. 0,75 35,000 11 each 2U0.00 2,600 18 each 3l;0.00 6,100 19 each ii30,00 8,200 2 each U90.00 1,000 53,000 lin.ft. 12.20 6U6,600 1,100 lin.ft. 12.80 iU,ioo UOO lin.ft. 13.90 5,600 500 lin.ft. 16. UO 8,200 lump sura lump sum lump sum $ 898,200 113,000 88,300 201,300 50,000 50,000 $l,lii9,500 K-$6 ESTIMATED COST OF SUPER HODGES-MIRAmR CONDUIT TO ACCOMPANY RESERVOIR OF 365^000 ACRE-=FEET CAPACITY (continued) Item Quantity Unit Price Cost Administration and engineering^, 10^ Contingencies J, l$/6 Subtotal Interest during constructionj, h% for one-half of 1 year construction period TOTAL $ 115,000 172, $00 $1,1437,000 28,700 $1,U65,700 ANNUAL COSTS Interest, 3o5/S Amortization^ l;0=year sinking fund at 3o^% Operation and maintenance Electric energy for pumping $ 51,300 17,300 21,700 37,700 TOTAL $ 128,000 TABLE K-29 K-57 ^ssTimuw 'coar of ra^JVRCEMENT of san vicente reservoir TO K STORAGE CAPACITY OF 113,600 ACRE-FEET* (Based on prices prevailing in 1958) Elevation of crest of dam; 680 feet U.S.G.S. datum Elevation of crest of spillway: 671 feet Increase in depth of water: 21 feet Increase in capacity of reservoir: 23,it00 acre-feet Capacity of spillway with 0.5 foot freeboard: 26,000 second- feet Item Quantity Unit price Cost CAPITAL COSTS Dam (including spillway) Exploration and grouting Existing concrete preparation Excavation ^fa.ss concrete Cooling concrete Miscellaneous meteuLwork Reinforced concrete Reinforcing steel 16,000 sq.yd. 36,000 cu.yd. 167,000 cu.yd. 167,000 cu.yd. 129,000 lbs. U90 cu.yd. 36,000 lbs. lump sum $ 25,000 $ 4.00 6U,000 3.50 126,000 18.50 3,089,500 .50 83,500 : .k3 58,000 50.00 2U,500 .15 5,^0 $ 3,1^75,900 Outlet Works Control house construction Butterfly valve, 36- inch diam. Cone valve, 2U-inch diam. 1 each 1 each lump sum 5,500.00 12,000.00 15,000 5,500 12,000 32,500 Reservoir Clearing 100 ac. 50.00 Subtotal Administration and engineering, 10^ Contingencies, 15^ Subtotal Interest during construction, 4^ for one-half of 1-yesir construction period TOTAL 5,000 $ 3,513,'tOO $ 351,300 527,000 $ 4,391,700 87,800 $ 4,479,500 ANNUAL COSTS Interest, 3-5^ Amortization, 40-ye8Lr sinking fund at 3-59^ Operation and maintenance TOTAL $ 156,800 53,000 4,400 $ 214, 200 Based on data published in Bulletin No. 61 entitled, "Feather River Project, Investigation of Alternative Aqueduct Routes to San Diego County** and adjusted to prices prevailing in 1958. TABLE K-30 ESTIMATED COST OF EKLARGEMENT OF SM VICENTE RESERVOIR TO A STORAGE CAPACITY OF 168,200 ACRE=FEET* (Based on prices prevailing in 1958) Elevation of crest of dam; 12k feet U.S.G.S. dat-om Elevation of crest of spillways Jlk feet Increase in depth of water; 6h feet Increase in capacity of reservoir 78,000 acre- feet Capacity of spillway with I.5 foo< freeboaird: 26,000 second-feet Item CAPITAL COSTS Quantity Unit price Cost Dam (including spillway) Exploration and grouting Existing concrete preparation Excavation Mass concrete Cooling concrete Miscellaneous metalwork Reinforced concrete Reinforcing steal Outlet Works Control house construction Butterfly valve, 36= inch diam. Cone valve, 2U-inch diamo Reserroir Clearing Subtotal lump sum $ 30,000 16,000 sq.yd. $ i+.OO 64,000 66,200 cu.yd. 3-50 231,700 4l7,sOOO cu.yd. 18.50 7,714,500 417^000 cu.yd. .50 208,500 313^000 lbs. = '^5 i4o,900 710 cu.yd. 50.00 35,500 53^000 lbs« .15 8,000 $ 8,433,10( lump sum 20,000 2 each 5, 500.00 11,000 1 each 12, 000.00 12,000 43,000 300 ac. 50.00 15,000 Administration and engineering, 10^ Contingencies, 15^ Subtotal Interest diiriaag constructional 4^ for one^half of 2~year construction period. TOTAL $ 8,491,100 $ 849,100 1,273,700 $10,613,900 424,600 $11,038,500 AMUAL COSTS Interest, 3.5^ Amortization, 40-year sinking fund at 3.5^ Operation and maintenance TOTAL $ 386,300 130,600 11,00 $ 527,900 * Based on data prepared for Bulletin No. 3 entitled, "The California Water Plan", and adjusted to prices prevailing in 1958 < K-59 TABLE K-31 ESTIMATED CAPITAL AMD ANNUAL COSTS OF REQUIRED ENLARGEMENTS OF SAN'.7IGEHTEil£SSER?QIR UNDER POTENTIAL PLANS OF DEVELOPMENT Required increaaa t Estimated :_ ? capital : t costs^ t Lo « Estimated average annual costs in storage capacity, in acre-feet^ Interest, 3.5$ r Amortization, i iiO-year t sinking fund t at 3o5$ Operation : and s maintetiance s Total 52j,iiOO $7p963,200 $278,700 1 9U,200 $ 3A00 $ 376,000 U9,U00 7^602 „800 266^100 89,900 3,000 359,000 1^03600 6,5ii5p700 229AOO 77sU00 2,i;00 308,900 25,600 Ii,7li3s800 166 J, 000 56 J, 100 1,500 223,600 n.iioo 3^,038,000 106,300 35^900 700 lil2,900 Required increase in storage capacity based on coordinatfe operation studies of San Vicente Reservoir with existing and potential developments in the San Dieguito River watershed and with an estimated seasonal import of 75sU50 acre-feeto Based on straight-line relationships between costs of the two specific en- largements detailed in Tables K-^9 and K-30. K-60 COPY State of California Department of Public Works DIVISION OF HIGHWAYS March '], 195^ Please refer to file No. XI-SD-19T-A,B Mr. David Powell Division of Water Resources Spreckels Building San Diego, Calif. Dear Mr. Powell: At your request,, we have studied the effect on State highways of the proposed San Pasqual reservoir as outlined on the maps which you furnished this office. The construction of the San Pasqual reservoir either to elevation kkO or elevation 520 would require the re-location of substantial portions of State Sign Route 78^ our road XI- SD-197=-A,Bo Because of the two arms of the reservoir extend- ing northerly and because of the rugged nature of the country, it would be very difficult to re-locate the highway along the northerly side of the reservoir. It might be possible to re-locate the highway just south of the "dam site" and through Highland Valley easterly to Ramona. This would involve a great length of new highway through very rough country and would entail steep grades. The most practical location appears to utilize the old U. S. 395 southerly from Lake Hodges to the County road through Green Valley and then easterly to a point near Rancho Del Sueno. From this point easterly, an entirely new location for a length of 5.3 miles would be required. It would carry the roaui to a con- nection with State Sign Route 67 at the Mount Woodson turn ap- proximately 6 miles west of Ramona. Estimated cost of this new construction for 5.3 miles and some reconstruction of 2-5 miles from County road through Green Valley is estimated to cost $900,000.00. Please advise if any additional information is required. Yours very truly, J. DEKEMA District Engineer BY /s/ R. A. Hayler Ro A. HAYLER cc:M. Bookman Assistant District Engineer Div. of Water Res., LoA. RAL RAH COPY K-61 February 1^+, 1958 Mr. J. Dekema, District Engineer District XI Division of Highways State Department of Public Works 4075 Taylor Street San Diego 12, California Dear Mr. Dekema: This Department is currently engaged in a two-year water resources investigation in the San Dieguito River watershed in San Diego County, which is being conducted in cooperation with the City of San Diego. Our report of investigation will include recommenda- tions as to locations, sizes, and costs of dams, reservoirs, and conveyance facilities within the watershed, including costs of relocating roads. Construction of dams at the Super Hodges and Ssm Pasqual "A" sites would, during certain periods, result in in^undation of portions of U. S. Highway No. 395 and State Sign Route No. 78- Several sizes of dams are being studied at each of these two sites, and the elevations of the spillway and dam crests are as follows: Elevations, in feet Reservoir site Spillway crest Dajn crest San Pasqual "A" lH3 U33 1^1^5 ^5 k'jo i+90 Super Hodges 365 38J+-388* 395 i^l3-i^l7* 1»03 U20-it2U* * Final choice depends on type of structure (concrete or rockfill) due to difference in residual freeboard allowance. Approximate locations of axises of proposed dams and the contour elevation equal to the dam crest elevation for the highest dam under consideration are shown on the attached U. S. Geological Survey quad. K=62 Mto Jo Dekeraa -2- February Ik, I958 Your letter of March J, 1956, File Noo XI-SD-19T-A,B, trans- mitted to Mro Do 0. Powell of this Department estimates of cost of necessary highway and bridge relocation as a result of construction of a proposed dam at the San Pasqual "A" siteo Mr. G<. T. McCoy's letter dated February 10^, 1953, to the State Engineer, State Division of Water Resources^ File No« 200 o 47 B 8^, furnished the same information for the Super Hodges dam site« In view of changing price levels and the sizes of dams being considered, it is necessary to modify and augment relocation cost information you previously supplied this Department <> It is respectfully requested that the costs of relocating the afore-mentioned highways, based on 195T prices, as a result of construction of each of the dams listed he:~etoforej be estimated and furnished this office. Separate costs for major bridge structures would be highly desirable. Your prompt consideration of this request will be greatly appreciated since our studies and report must be completed by June 3O;, 1958 = MTo Jo Go McGl^axg, Associate Hydraulic Engineer and Resident Engineer for the San Dieguito River Investigation, is in charge of our investigation field offiee located at 2l8 East Grand Avenue, Escondido, (telephone numbers SHerwood 5-5998) » Mr. McGIurg will contact your office in the near fut-ijre to facilitate the preparation and transmittal of the desired cost data. Very truly yours ^ HAR¥EI 0. BAMS Director of Wat-er Resources Max Bookman Max Bookman District Engineer Encs. COPY State of California Sacramento 7 K-63 Mro Harvey 0<. Banks TO ; Director Department of Water Resources IIKPBR-DEPARTMEJJTAL COMMUNICATION DATE; May 6, I958 FILE NO, XI-SD-77, 197-B,A,B FROMs Division of Highways In letter dated February l^^,, 1958, Mr. Max Bookman re- quested information from the Division of Highways regarding updated costs for State highway relocations in the vicinity of Super Hodges and San Pasqual "A" Reservoirs in San Diego County. Estimated costs on the basis of 1957 prices for the State highways affected by these water projects are as follows; SUPER HODGES Roadway & R/W Structures {k lanes ^ spillway elev<, 365) $2,7^7,000 $1,8^3,000 {h lanes, spillway elev. 395) $3,6ii-5,000 $7,288,000 (h lanes, spillway elevo k03) $3,886,000 $7,288,000 Total $ i+, 590,000 $10,933,000 $11,17^,000 The Division of Highways has a project now in the planning stage to convert Route 77 to four lanes at this location, and it is for this reason the above estimates each reflect cost to remove a U-lane facility from reservoir backwater. The above estimates assume that the new one-way bridge at Green Valley Creek will clear high water from spillway crest elevation i+03. If studies subsequently indicate an excess cost to State highway funds for this clearance, a low level structure will be built, in which event each of the above three estimates will have to be in- creased by $625,000 to provide a new bridge for cleeurance of the backwater pool. Super Hodges construction will also affect the State high- way between Escondido and Reunona. Estimated cost of reconstructing this route to clear the three reservoir levels is as follows: K=6li Mto Harvey 0. Baoks May 6, 1958 SUPER HODGES., Conto Route XI-SD-197-A,B Structures (2 lanes s spillway elevo 365) $ 67,000 $ (2 lanes J, spillway elev, 395) $ i^73,000 $ 50,000 (2 lanes, spillway elev. 403) $ 85lpOOO $ 60,000 Total $ 67,000 $ 523,000 $ 911,000 San Pasqaal °°A" Reservoir affec^ts only the State highway between Escondido and Ramonac Estimated cost of relocation, con- templating ra;-;c'nst:ruet-ion geaerally north of the existing State high- way, is as follows s SM PASQUAL "A" Route XI-SD-197-A,B Structures Total (2 lanes, spillway elevo 413) $1,19^,000 $1,117,, 060 $ 77^000 (2 lanes, spillway eleVo ij-li-5) $7,850,000 $7, 564 ,,060 $ 286,000 (2 lanes, spillway elev« 470) $9,638,000 $9,303,000 $ 335,000 All foregoing estimates are reconnaissance in nature and are subject to such r^Hvision foundation tests, classification of materials and instrument surveys would require. Engineering costs are not included in the figures. ORIGINAL SIGNED BY Go T. McCOY G. To McCoy State Highway Engineer . COPY K-65 Mto G. T. McCoy State Highway Engineer Division of Highways Department of Piablic Works 1120 N Street Sacramento^ California June 6, 1958 Xl-SD-77p 197-B, A, B Cost of Relocation of Highways in San Dieguito River Watershed in San Diego County Attention; Mr. Re, ¥» Potter Reference is made to your inter-departmental communication of May G, 1958, transmitting an estimate of cost of relocating State Highway Nos. 395 and 78 in the vicinity of Super Hodges and San Pasqual Reservoir sites on the San Dieguito River in San Diego County, Receipt of this information was acknow- ledged by our inter -departmental communication of May 20, 1958» A review of your estimate of the cost of relocation of State Highway No. 78, which would be required by construction of San Pasqual Dam and Reservoir with water surface elevation of 4l3^ U45, and i^70 feet,, indicates that the new highway route you have selected extends along the north side of San Pasqual Valley and would cost $9, 638;, 000 for the 470-foot reservoir elevation. Yoxir letter dated March 7, I956, signed by Mr. J. Dekema, District Engineer, District Xl^ Division of Highways, San Diego, a copy of which is attached hereto, discussed relocation of State Highway No. 78 along the north side of San Pasqual Valley, and through Hig^hland and Green Valleys. Your letter con- cluded thats "The most practical location appears to utilize the old U. S. 395 southerly from Lake Hodges to the County road through Green Valley and then easterly to a point near Rancho Del Sueno. Prom this point easterly, an entirely new location for a length of 5.3 miles would be required. It would carry the road to a con- nection with State Sign Route 67 at the Moiont Woodson turn approxi- mately 6 miles west of Ramona. Estimated cost of this new con- struction for 5.3 miles and some reconstruction of 2,5 miles from County road throu^ Green Valley is estimated to cost $900,000.00." It Is understood from a telephone conversation -with Mr, R. V. Potter of yoxir Sacramento office tiiat the current cost estimate is based on the costly northerly alignment because the existing route, adopted by the State Highway K-.66 Mr. G. To McCoy -=2- June 6, I958 Commission, is north of San Pasqual ¥alleyo Examination of United States Geological Survey topographic maps at a scale of l;2i<-j,00C) indicates that a route from Escondido to Ramona through Green Valley would exceed the length of ths present route by approximately seven miles, while a route through Highland Valley would exceed the length of the present route by three miles . In view of the differential in cost of over $8,000,000 between your estimates for the northerly and Green Valley routes^ it would appear unreasonable and unrealistic for this agency to assums that the northerly route would ever be constructed o Selection of the surface storage development to be constructed in the San Dieguito River watershed will be based on cost and yield comparisons.. Naturally, an addition of $8^00C5 5 000 to the cost of the San Pasqual project might well exclude it from further consideration = Since our final report of investigation is sehedxiled for completion by June 30, 1958, preparation of a detailed estimate of current cost of relocation through either Green or Highland Valleys is not feasible o However, it would be greatly appreciated if you would provide this Depsi'tment with a communication for our files setting forth your reasons for selecting the northerly route rather than the less costly routes through Green and Hi^land Valleys recommended by your Division previously. HARVEY 0, BANKS Director of Water Resources Max Bookman District Engineer COPY State of California Sacramento 7 K-67 INTER-DEPARTMESTAL COMMUNICATION Mr- Harvey Oo Banks TOs Director Department of Water Resources FRCMt Division of Highways DATE; July 2, 1958 FILE NO. XI-SD-77, 197-B,A,B This refers to comntunication dated June 6, 1958^ signed by Mto Max BooktBan, regarding estimates of cost for relocating legislative Route 197.? between Ramona and Escondido, in event of construction of San Pasqual Dam and Reservoir. Explanation is requested why the Division of Highways reports a relocation of highway route confined to northerly side of San Pasqual Valley, when a communication from the Division of Highways in 1956 men- tioned relocations by way of Highland Valley and Green Valley at less costo The present road between Escondido and Ramona was added to the State Highway system by legislative act. In reporting to your office cost of adjustment needed in State highway to clear reservoir elevation U70 it is necessary that the Division confine its estimate to this official route, notwithstanding the fact that possibilities exist in this area for alteration to the State high- way system in the event of reservoir construction. The information furnished yotir office in 195^ regarding cost of the Green Valley route is significant and it is recognized that it may be in the public interest for the water project sponsors to advocate construction along this route at a savings to the reservoir project. It is our opinion, however, that the relocation of legislative Route 197 along Green Valley would not comply with the present legislative description of this routej therefore, action by the Legislature would be required before such a routing could be adopted o To avoid any misunderstanding in this respect, our reply to your office was confined to a relocation in the vicinity of the existing route that would comply with the present satutory descrip- tion with full knowledge of the greater initial first cost as com- pared to a relocation along Green Valley. /s/ G. T. McCoy Go T. McCoy State Highway Engineer K=68 WATER DEPARTMENT CITY OF SAN DIEGO October 6,, 1958 Main Office Civic Center COPY San Diego Ig California Room 273a Civic Center Mto Max Bookman Dap to of Water Resources Po Oo Box 15718 Los Angeles c, California Subject? San Dieguito Area Study- Dear Mro Bookman? In accordance with your recent request^ we are enclosing the following documents? 1« Historical costs of facilities on the San Dieguito systemo The date of acquisition^ description and original cost is indicatedo Many items in the lower portion of the system are included but are sufficiently detailed so that you may eliminate them as necessaryo 2 o A copy of the right of way contract between the State of California Division of Highways and the City of San Diego for the construction of the two lane bridge on Highway 395 across Lake Hodges and also a letter from the Ass' to City Manager j, Mro Blom^, dated Septo 11 referring to the bridge constructiono 3o A copy of the Wehe report analyzing the cost of water and the rate structure adopted by the City last Springo If further information is desired, please feel free to contact this office o Very truly yours, /s/ Ro Eo Graham Ro Eo Graham Utilities Director REGtbs enco K-69 (EnclosTire to letter from City of San Diego Water Department, dated October 6, 1958) COPY September lip 1953 Mto Eo Eo Wallace^, District Engineer State Division of Highways Po Oo Box 390 San Diego 12 ^ California Subjects Hodges Reservoir Bridge Dear Mr,, Wallace? Reference is made to discussions concerning a high level and temporary low level bridge on U, So Highway 395 across Hodges Reservoir and especially the timing of possible construction of a Super<=Hodges Cam which would iniandate any temporary low level constructiono Some inquiry was made as to the possibility of the City of Ssui Diego reimbursing the State for the City' s share of such high level bridge should it be built nowj on account of a future Super=Hodges Dam,, toqoiry was also made as to whether the City would be willing to grant a permit for the construction of a temporary low level structure across City=owned landSj ^ich structure would consist of approach fills and a bridge of the piling and deck type with openings aggregating about 200 feet in length. The question of timing of Hodges construction completion is shown on our drawing File Noo 3825s, "City of San DiegOj California, Population and Water Requirements'* <, .It is indicated thereon that in the normal course of events the reservoir might be com- pleted sometime between 1962 and 1969 o The construction of this additional development is interdependent with policies of the San Diego County Water Authority who are the agency importing Colorado River water for use by the City of San Diego as well as other agencies. The timing is also affected by the Metropolitan Water District's statement of policy that they will supply the needs of this area. If this policy can be carried out it may be less expensive for the City to secure additional water supplies through the San Diego Co\anty Water Authority than by the develop- ment of Hodges or other local reservoirs « Furthermore;, the First and Second Barrels of the San Diego Aqueduct will bring into this area about I50p000 acre feet of water annually of which the City is entitled to about 75^ o If the Metropolitan Water District is able to supply the needs, as they indicates the City would be entitled out of this amount to K=.70 MTo E, Eo Wallace »2= 9/11/53 about 112 J, 000 acre feet annually which when added to the local development of upwards of UOpOOO acre feet annually will provide for the City about l$Oj,000 acre feet. This„ according to the chart previously referred to, will meet our needs until about 1970, It appears to be reasonably certain that the Super-Hodges develop- ment will not be made within a ten year period » If a high level bridge is built at this time, the City cannot obli= gate itself to reimburse the State for any funds which may have been advanced on the City'' s accounto The City would have no ob- jection to a temporary low level road and bridge to replace the present structure and alignmentj, which has resulted in so many accidents o providing the City' s obligation in connection with a future high level bridge is not affected in any way by the con- struction of this temporary low level realignmento On this basis, the City would be willing to grant an encroachment permit over City^owned land. There is no objection to leaving the existing bridge in place and when a high level bridge is built it would only be necessary to remove a relatively minor portion of the proposed temporary bypass so as to permit access to the upper end of the reservoir by boats « There will also be no objection to the State excavating materials from within the basin at approved location for making the access fillo Very truly yours ^ Eo W, Blom Assistsmt City Manager PB/f cc Director^ Water Depto (Enclosiire to Ifetter from City of San Diego Water Department, ~ "■ '"^ dated October 6^ 1958.) C P I RIGHT OF WAY CONTRACT=.=STATE HIGHWAY Document No* 6013 in the form of an easement for public highway purposes g covering the following described property, hereinafter called "New Property" a a portion of Lake Hodges Reservoir has been executed and delivered to the DIVISION OF HIGHWAYS of the State of California o In consideration of whichj, and the other considerations hereinafter set forth, it is mutually agreed as follows ^ lo The parties have herein set forth the whole of their agreemento The performance of this agreement consti- tutes the entire consideration for said document and shall relieve the State of all further obligation or claims on this accoxintp or on account of the location, grade or construction of the proposed public improvement. 2 » . <, . . . o o L~10 L-2 Summary of Data Used in Reservoir Operation Studies ooc.o<.ooo«<.e.«<...o L-15 If-3 Summary of Various Operations of Hodges Reservoir for the Period 19lU-l$ Through 1S*|?6"57 oo«o.o»o„ooo.o...o L-lo L-ii Summary of Seasonal Storage j Surface Area, and Length of Shore Line of Hodges Reservoir for Various Methods of Operation for the Period 191ii-l5 Through 1956-^7 o » , . « , . » . , L-17 (1-3) L"ii APPENDIX L RESULTS OF RELATED RESERVOIR OPERATION STUDIES Introduction Values of safe yield of existing and potential reservoirs within thiS SaTi Dieguito River watershed were estimated both on the basis of operation of facilities solelj"" within the watershed and with coordinate operation of San Vicente Reservoiro Values of safe yield estimated in this manner are presented in Chapters IV and VI of the text of the report. In addition and pursuant to the agreement authorizing this investigation, values of safe yield of major developments located outside the San Die- guito River watershed affecting the City of San Diego were determined and are presented in this appendix. Values of average storage, surface area, and length of shore line of Lake Hodges under various assumed operating conditions are also set forth in this appendix. Maior Reservoirs Outside the San Dieguito River W atershed That Affect the City of San Diego The major water supply facilities in San Diego County outside the San Dieguito River watershed that affect the City of San Diego are reservoirs comprising the San Diego River system and the Cottonwood Creek- Otay River system. The safe yields of these systems, along with the cri- teria employed in the determination of these yields, are discussed herein. San Diego River System The three major water conservation reservoirs located in the San L-5 Diego River system are the City of San Diego's San Vicente Reservoir on San Vicente Creek and El Capitan Reservoir on the San Diego River and Helix Ir- rigation District's Ctiyamaca Reservoir on Boulder Creek. Locations of these reservoirs are shown on Plate lU of the text. The confluence of San Vicente Creek and the San Diego River is lo- cated below El Capitan and Cuyamaca Reservoirs and the operation of these two reservoirs does not directly affect San Vicente Reservoir, It is possible to transfer water through conduits between El Capitan and San Vicente Reser- voirs, in either direction j depending on water levels in the two reservoirs; however^ representatives of the City of San Diego have stated that it is not their normal policy to transfer water between these reservoirs. Operation of San Vicente Reservoir in conjunction with Sutherland Reservoir located on Santa Ysabel Creek in the San Dieguito River watershed, and yields derived therefrom s are discussed in detail in Chapters IV and VI of the text and, thereforej will not be discussed further. Representatives of the Helix Irrigation District report that the District has a right to a total gross average annual diversion of 10,000 acre-feet from the San Diego River (regardless of source or method) over a ten-year period, with the rate of diversion upstream from El Capitan Reser- voir not to exceed 2 7 second-feeto The District also has a contract with the City of San Diego under the terms of which the District may store water in El Capitan Reservoir, located downstream from Cuyamaca Reservoir, in amounts up to 10,000 acre-feeto The District also reports it has a right to tempo- rarily store Cuyamaca Reservoir water in EL Capitan Reservoir each year, from May 1, to October 31 » The safe yield of EL Capitan Reservoir was estimated, by means of 1^6 a manual reservoir operation study j on the basis of the following assriraptions : lo El Capixan and Cuyamaca Reservoirs would be full on May 1, 19l;U, and the period May 1,, 19hhi through January 31.? 1958 ^ was considered critical with respect to safe yield reservoir operations » 2o Water in storage in Cuyamaca Reservoir would be transferred to El Capitan Reservoir each spring, 3» Reservoir evaporation losses would be apportioned between the City and the District according to the amount of water stored by each party, lio No more than 10,000 acre=feet of Helix Irrigation District water would remain in El Capxtan Reservoir after October 31, During years in which the amount of District water stored in El Capitan Reservoir would exceed 10,000 acre-feet on the basis of a uniform seasonal draft, with- drawals from the reservoir by the District would be increased to the extent necessary to result in a storage of 10^000 acre-feet of District water on October 31 « 5o The monthly draft from El Capitan Reservoir was based on the monthly distribution of seasonal water demand by the City of San Diego, as presented in Table 12 of the text. Estimates of runoff at the reservoirs were based on records fur- nished by the United States Geological Survey, the City of San Diego, and the Helix Irrigation District, Where records were not available, estimates in Bulletin No, U8 entitled "San Diego County Investigation", 1935, were used. Based on the previous assumptions, the safe seasonal yield from El Capitan Reservoir to the City of San Diego was estimated to be 9,800 acre-feet. L-7 Cottonwood Creek-Otay River System FoTir water conservation reservoirs, all owned and operated by the City of San DiegOp comprise the Cottonwood Creek-Otay River system. Loca- tions of Upper and Lower Otay Reservoirs located on the Otay River and Morena and Barrett Reservoirs located on Cottonwood Creek are shown on Plate lit of the texto Although Cottonwood Creek is not a tributary of the Otay River J these foiir reservoirs must be treated as one system in much the same manner as are Sutherland and San Vicente Reservoirs since water is transferred through Dulzura Conduit from the Cottonwood Creek reservoirs to Dulzura Creek, a tributary of Jamul Creeky which is tributary to the Otay River above the Otay Reservoirs o From these reservoirs water enters the distribution system of the City of San Diego » Due to the relatively small size of Upper Otay Reservoir in re- lation to Lower Otay Reservoir and since only the total runoff to both reservoirs is reported in the available United States Geological Survey runoff records s these two reservoirs were assumed for purposes of the yield studies to be a single reservoir <> With this in view, the upper por- tion of the area-capacity curve for Lower Otay Reservoir was modified to include Upper Otay Reservoir j, and it was assumed in estimating evaporation losses that storage in the two reservoirs would be depleted in equal amounts until Upper Otay Reservoir was depleted » The combined safe yield from Barrett and Morena Reservoirs was de- termined, using electronic computing machines, on the following basis; (1) balanced storage; and (2) the system draft was applied on the lower or Bar- rett Reservoir first while maintaining Morena Reservoir full until such time as the dead storage level was reached in Barrett Reservoir^ after which time the combined draft was applied to Morena Reservoiro Dead storage level in 1^8 Barrett Reservoir was maintained by diverting subseq-uent inflow and reducing the draft on Morena Reservoir by this amount. It was necessary to estimate the safe yield from these two reservoirs by both methods since it was not apparent by inspection which type of operation would produce the greatest yield. The second method of operation whereby the combined system draft is first applied on Barrett Reservoir resulted in about loi; per cent more safe yield than the first method using the balanced storage concept, and pro- vided a combined safe yield of 7 -.100 acre-feet per year. The net evaporation loss per acre-foot of storage in Morena Res- ervoir is greater than that ao Barrett Reservoir, but it is believed that any savings in water resulting from reduced evaporation effected by releas- ing stored water from Morena Reservoir, would be more than offset over a long-time mean period by the increased loss of water spilling from Barrett Reservoir while storage space was available in Morena Reservoir. Comparison of the result-s of the Otay and Morena-Barrett Reser- voir operation studies disclosed that storage space was available in Otay Reservoir while water was spilling from Barrett Reservoir, The safe yield from Otay Reservoir was then recomputed assuming utilization of the unused conveyance capacity of the Dulzura Conduit to increase the transfer of water from Barrett Reservoir to Otay Reservoir during times of spill in Barrett Reservoir in a manner similar to that described in Chapter IV and VI of the text for Sutherland and San Vicente Reservoirs, The safe season- al yield of Otay Reservoir when considering the transfer of a portion of the spills from Barrett Reservoir was estimated to be 5j200 acre-feet, or 200 acre-feet more than when spills are not considered. The total combined safe seasonal yield from the Cottonwood Creek-Otay River System is, there- fore, estimated to be 12,300 acre-feet. L-9- The combined monthly draft from Otay, Morena, and Barrett Reser- voirs was based on the monthly distribution of seasonal water demand by the City of San Diego, as presented in Table 12 of the text. Estimates of runoff at the reservoirs was based on records furnished by the United States Geological Survey and the City of San Diego, It was assumed for purposes of the safe yield determinations that the three reservoirs would be full on April l^, 19l;3<. Values of safe yield of major reservoirs located outside the San Dieguito River watershed affecting the City of San Diego and the esti- mate of safe yield of existing surface storage facilities in the watershed are presented in Table L=lo L=10 TABLE L-1 COMBINED SAFE SEASONAL YIELD OF RESERVOIRS AFFECTING THE CITY OF SAN DIEGO Reservoir Safe seasonal yield, in acre-feet Sutherland ) Hodges ) San Vicente* Natural runoff Diverted spills from Sutherland Reservoir El Cap it an Morena ) Barrett ) Upper and Lower Otay Natural runoff Diverted spills from Barrett Reservoir TOTAL 8,200 5,200 900 6,100 9,800 7,100 5,000 200 5,200 36,iiOO ^ Does not include imported water. 1^11 Results of Other Operation s of Hodges Reservoir To aid the City of San Diego in evaluating various operations of Hodges Reservoir, particularly in regard to yields and recreational benefits based on average reservoir storage ^ surface area, and shore line 5 the following reservoir operation studies were conducted for the period 1911i.<='l5 through 1956-57 as a result of a specific request of the City of San Diego s lo Combined safe yield operation of Hodges and Sutherland Reservoirs o 2« Safe yield operation of Hodges Reservoir assuming a secon- dary yield operation of Sutherland Reservoir. 3o Secondaiy yield operation of Hodges Reservoir assuming a secondary yield operation cf Sutherland Reservoiro ka Safe yield operation of Hodges Reservoir assuming that Sutherland Reservoir had not been built. The area=capacity relationships presented in Table 28 of the text and the net seasonal \init evaporation rate set forth in Table 29 of the text were used in all four operation studies. The dead storage capa- city was assumed to be i.^OOO acre=feet for the first three studies and Il^BOG acre-feet for the fourth study in which it was assumed that Suther- land Reservoir had not been constructed. Dead storage capacities were estimated from anticipated rates of sedimentation which were based on historic losses in storage at Hodges Dam. Estimates of the mean seasonal runoff "Between Sutherland Dam and Hodges Dam" are presented in Appendix D and were used in the first three studies of Hodges Reservoir operation. To these values of runoff L-12 entering Hodges Reservoir were added volimes of spill from Sutherland Reservoir to determine total inflow to the reservoir. The City of San Diego operates Sutherland Reservoir on a secondary yield basis as described in Chapter IV of the text« With this method of operation, spill would occur in only two months during the 1915-16 season assuming the reservoir empty at the beginning of the study period, 191ii-l5 through 1956-570 Records of historic runoff to Hodges Reservoir, ad- justed for the effect of Sutherland Reservoir commencing with the 1953-5U season were utilized in the fourth study in which it was as- sumed that Sutherland Reservoir had not been constructed. In the first study j, the combined safe yield operation of Hodges and Sutherland Reservoirs^ it was assumed that the combined safe yield of the two reservoirs would be applied first as a draft on Hodges Reservoir until dead storage level was attained or the demand exceeded the diversion capacity of the conveyance works from Hodges Dam, and second as a draft on Sutherland Reservoir, Diversions from Hodges Reser- voir would take place when necessary to maintain the dead storage level in that reservoir,, With this type operation, the seasonal system draft is the same every year but will not be the same each year for any par- ticular reservoir. The system draft for any particular month is the same every year and is based on the average monthly distribution of sea- sonal urban demand by the City of San Diego as shown in Table 12 of the text. In the second study, the safe yield operation of Hodges Reser- voir, with Sutherland Reservoir operated on a secondary yield basis, the draft is the same every year and is the same for any particular month in L-13 every year based on the afore-mentioned average monthly distribution of seasonauL urban demand by the City of San DiegOo In the third study^ the secondary yield operation of Hodges and Sutherland Reservoirs ,i diversions from Hodges Reservoir are assumed to be effected at a rate equal to the conveyance capacity of the con- duit between Hodges and San Dieguito Reservoirs. It was assumed that water would be diverted between Sutherland and San Vicente Reservoirs at rates commensurate with storage levels in Sutherland Reservoir. The secondary yield of Hodges Reservoir varied from a minimum of zero for six years to a maximum of about 1^,900 acre-feet per year for sixteen years during the study period, 191U-15 through 1956-57. Assumptions used in the fourth study which evaluated the safe yield of Hodges Reservoirs assuming Sutherland Reservoir had not been builtj were the same as those used in the second studyj safe yield operation of Hodges Reservoir with Sutherland Reservoir operated on a secondary yield basis ^ except that the allowance for dead storage was estimated to be iijBOO acre-feet. The estimate was based on the condi- tion that sediment would not be deposited in Sutherland Reservoir and that the runoff entering Hodges Reservoir would be equal to the historic flow adjusted for the actual effect of Sutherland Reservoir since it was first operated in 195Uo Hodges Reservoir was assumed to be full in April, 19U.3, and the study period was taken to be 19U2~U3 through 1956-57. Reservoir storage capacity, dead storage, runoff, and evapora- tion data pertaiining to the nine reservoirs for which operations are described herein appear in Table L-2. Average seasonal inflow, draft. L-lli spill, evaporation, and storage for Hodges Reservoir for the four types of reservoir operations described herein are presented in Table L-3, while a summary of seasonal storage, surface area, and length of shore line for Hodges Reservoir for the first three operation studies is set forth in Table L-U. L-15 § T) ^ h -P -H O O ^ ^ ^ (B QJ Q> asm o c§ ^ CD 0) -p M o O -:!■ CO f^ ON ff. <^ On r-i u\ O O ••^ O r- vO o», •> — • o s cfl C <<-{ ^ 0) O to +5 u 0) TJ XAf- c a. tH t ! Q) |> <« m od rt o T^^ W) Q) iD P, g (13 in Ss 0) •H 3 On On fn Ch g" ■P ^ H rH 0) O C5 Q W ^ t^ K CO Q i .g ^ •S tD ?! O o s W) ^S xl Q) CO c6 m m (6 Xi •H OJ f^ CO ft O -p < 0} n -p S C o 0) •H bjOH -P 1 oJ cf c6 f-i a u m a < 0) > m 0) • • H Q) ce bO fl H cS O H fn ro -H Q) 03 O^ > TO < m • o H 0) a^. 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