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.,.... .,. .l....-.: Metropolitan Water District and other agencies in accordance with "iinute No. 240 of the International Bo~ndary and Water Commission. Of the 274,000 acre-feet of delivery in ell.cess of the Treaty's minimum requirement, about 207,000 acre-feet was covered under provisions of the Commission's Minute No. 242, the 1973 agreement with Mexico, and about 67,000 acre-feel was chargeable to operational control of the river and to U.s. users not taking ordered water. About 97 percent of the excess deliveries chargeable (0 operational control occurred during two maior storms in the lower Color ado area, and consisted primarily of uncontrollable floodwaters. Minute No. 240 is described in the Board's 1972 Annual Report and Minute No. 242 is described in the Board's 1973 Annual Report. The Colorado River Basin Salinity Control Act of 1974 recognizes "replacement of the reject stream from the desalting plant and of any Welhon-Mohawk drainage watN bypas,>ed to the Santa Clara Slough . . . a,> a national obligation. Since passage of the Act, the following amount of water has been discharged from the Well ton. Mohawk Main Outlet Drain Extension below Morelo,> Dam: Penod I?Pledwdthrooi/;' a.....lton.\lo;,d..' \lODE .j (,~al"-ff"(>f) 113.M5 214,719 ~ 5H.7",Q luIlt'15-DK.31,t974 lQ75 Cdlenddr ~{"dr 1976 Calendar H'd' Totallhrough 1976 The Department of the Interior's Final Environmental Statement on the Title I facilities recognizes the,>e b.,.passed quantities as a debit against the water to bE> salvaged b\' lining the Coachella Canal. The Statement indicate,> that credits from the Coachella Canal lining salvage ....ould be u'>t"d to offset past debit<" to credit against brine discharge hom the future desalting plant, and to accumulate credits to offset future brine di<,Charges. Beloul A~'erage Wafer Supplies Available data and forecasts for the 197&-77 water year indicate that the Colorado River Basin will again experience a below average year. At the end of 1976, the Bureau of Reclamation forecast an April through Julv inflov,,' 10 Lake Powell of 5,000,000 acre-fl'€t. or onlv 60 percent of the 1906-1975 average used by the Bureau_ However, with in excess of 47 million acre-feet of active surface storage in the major Colorado River Basin rest>rvoirs, there will be no reduction in deliveries of Colorado River supplies to California. With the northern and central portions of California facing another dry year following the 1976 dry year, the Color ado River supply 10 Southt.'rn California takes on a more important role as a major source of imported water to supplE'ment othl'f California supplies. Future e,Hin ~\'afer Supply A vailnbilitr to C'Ililornia During 1976, the Chief Engineer presented testimony bt>fore the Cooling waler lor ptoposed Sunder-erl Nuclear Power Planl would come Irom Colorado R,yer. agricullural drainage. California Energy Resources Con,>ervation and Developmpnt Commission on the water supply a..pects of the San Diego Gas and Electric Company's proposed Sundesert nuclear power plant near Blythe, California. The 1,900 megawatt plant \\'ilI require about 34,000 acre-fN't of water per year for cooling. Half of that water has been obtained trom The Metropolitan Water District of Southern California, and the other half from Palo Verde Irrigation District (PVIDI. SDG&E purchased irrigated lands within PVID which have permanent Colorado River water rights and will reduce water use on the land to obtain its cooling water. The Chief Engim:.er concluded. after considering projected future water development in the Basin, a probable 10ng-tE'rm average annual undepleted water supply of 14 million acre-feet at lee Ferry, legal constraints on water use, and operation of the Basin'.., re..ervoir ..,ystem in compliance with the Coordinated Operating Criteria, that the Metropolitan Water District and Palo Verde Irrigation Di,>trict will receive sufficient Colorado River water to deliver water at all times to the Sundesert Project in the amounts stated in the respective watE'r supply agreements. '"