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<br />""'ZONA V. CALIFORNIA AND PACIFIC SOUTHWEST WATER PROBLEMS 57
<br />
<br />More than half the population of the state, approximately 10 million
<br />people, however, now live in southern California, almost double the
<br />number living there in 1946, and the Metropolitan Water District ex-
<br />pects 20 million people in the area by 1990.
<br />The State of California has agreed to increase the maximum annual
<br />entitlement of the Metropolitan Water District for water from the
<br />state water facilities from 1.5 million acre-feet per year to 2 million
<br />acre-feet per year. The State Water Project was designed to meet the
<br />needs of southern California through 1990.
<br />It can be seen from Table XV that beginning in 1975 and through
<br />1990 water supply and water demand will be in balance in the Metro-
<br />politan Water District service area and, in fact, increasing ground
<br />water storage is expected beginning in 1975.
<br />Thus, based upon assumed Colorado River supplies to the Metropoli-
<br />tan Water District of 550,000 acre-feet in 1990 (the portion of a 4.4
<br />million acre-foot priority extending to 1990 which the Metropolitan
<br />Water District would receive, the increase in the contract entitlement
<br />for the State Water Project, together with the proposed increased
<br />capacity of the City of Los Angeles Aqueduct, will mect the needs of
<br />coastal southern California throug'h 1990 based on present construction
<br />schedules. The critical periods and the periods of water deficiency, as
<br />
<br />TABLE XV
<br />
<br />ESTIMATED SUPPLIES OF WATER AVAILABLE AND DEMAND IN
<br />MWD COASTAL PLAIN SERVICE AREA
<br />
<br /> 1965 1970 1975 1980 1985 1990
<br />Non-M.W.D. supply
<br />Local firm annual yield1_________________ 1,075 1,068 1,063 1,059 1.057 1,055
<br />Repumped replenishment deliveries2_ __ ___ 229 327 362 395 422 446
<br />Reuse of applied water3__________h_____ 142 159 173 IS9 202 212
<br />Waste water reclamation4__ ______ _hUn 15 30 45 60 75 90
<br />Los Angeles City Aqueduct5_____________ 320 470 470 470 470 470
<br />SubtotaL______n_ _ _ __ __ h __ __ _ __ --- 1,781 2,054 2,113 2,173 2,226 2,273
<br />M.W.D. supply
<br />Colorado River Aqueduct6_______________ 1,180 1,180 1,180 970 760 550
<br />State Water Project7____________________ 0 0 550 1,050 1,550 2,000
<br />Sea water converaion__n______u________ 0 0 100 100 100 100
<br />SubtotaL_____ _ _ _ _ _ _ ___ _ __ _ _ ____ __ _ __ 1,180 1,180 1,830 2,120 2.410 2,650
<br />Total supply___ _ _ __ __ __ _ _ _ ______ _ _ _ __ 2,961 3,234 3,943 4,293 4,636 4,923
<br />Total demand____ ____________________ 3,009 3,468 3,850 4,210 4,564 4,891
<br />Net increase in ground water storage________ -------- -------- 93 83 72 32
<br />Net decreaae in ground water storage_______ 48 234 -------- -------- -------- --------
<br />
<br />(Unit: thousand acre-feet)
<br />
<br />1 Diversions from surface streams or pumping from underground basins to the extent that recharge is accomplished from
<br />natural sources.
<br />2 That portion of the deliveries of imported water for ground water replenishment whieh is subsequently recaptured by
<br />local agencies.
<br />B Water applied for M&I use and agricultural uses which percolates of its own accord to undcrgorund and is subsequently
<br />repumped.
<br />f Water treated and spread for percolation into underground and subsequent repumping.
<br />Ii Includes completion of second barrel of Owens River Aqueduct by 1970.
<br />e A8Suming operation of Central Arizona Project in 1976 and based upon water supply estimates of Colorado River Board.
<br />'Including prepared enlargement of yield of State Water Project to 4,230,000 acre-fe(lt,
<br />
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