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<br /> <br />~ 2',000,000 acre-feet. It, of course, would not all be needed <br />00 <br />~ initially but could be staged. Analysis ahows the following <br />~ <br />staging to be appropriate: year 1990~ 1.0 m.a.f.; 2000, 0.5 m.a,f.; <br /> <br />and 2010, 0.5 m.a.f. <br /> <br />The derivation of 2,000,000 acre-feet "s the required magnitude <br /> <br />of augmentation to assure 1.5 m.a.f. to the Lower Basin is based on <br /> <br />Bureau of Reclamation estimates of future main-stem losses after <br /> <br />realization of salvage potentials along the lower Colorado River. <br /> <br />There is not full agreement among other Colorado River experts as <br /> <br />to the effectiveness of future water salvage measures, and estimates <br /> <br />of the amounts of augmentation water required to assure 7.5 m.a.f. <br /> <br />conswnptive use in the Lower Basin range up to 2.5 m.a.f.While <br /> <br />the Bureau of Reclamation believes that its estimate of 2.0 m,a.f. <br /> <br />is adequate, this report also presents an alternative study based <br /> <br />on the requirement of 2.5 m.a.f. as the necessary amount of augmen- <br /> <br />tation to assure 7.5 m.a.f. of Colorado River water for the Lower <br /> <br />Basin States. Under this alternative the following staging of <br /> <br />desalting plants would be a?propriate: Year 1985, 0.15 m.a.f.; <br /> <br />1990, 0.5 m.a.f.; 1995, 0.75 m.a.f.; 2010, 0.5 m.a.f. <br /> <br />Upper Basin Water, Sup'ply--Based upon. past records of Colorado <br /> <br />River runoff and operation :of the reservoirs of the Colorado River <br /> <br />Storage Project, studies show that with delivery of 75.0 m.a.f. of <br /> <br />water at Lee Ferry every 10 consecutive years, there would remain <br /> <br />but 6,55 m.a.f. for consumptive use annually in the Upper B,asin. <br /> <br />If the Upper Basin were required to contribute in addition one~half <br /> <br />8 <br />