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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Desalting Plant, in some months, Reclamation reduced pumping from river <br />regulation wells in the Yuma area. Using this approach, operation of <br />the Desalting Plant has not been required in order to meet the salinity <br />differential. <br /> <br /> TABLE 1. <br />AVERAGE RIVER FLOWS WITH RETURNS BYPASSED <br /> QUANTITY QUALI~ ~Y <br /> ciooo an "Coom <br />River Flow at Imperial 1,110.0 750 <br />WMIDD Drainage 0.0 0 <br />Yuma Valley Return Fl ows 250.0 1,400 <br />Delivered to Mexico 1,360.0 870 <br />Rejected or Lost Bypass 145.0 nfa <br />Salinity Differential nfa 120 <br /> <br />The United States continues to allow the bypass and loss of the WMIDD <br />irrigation drainage and continues to have use of the estimated <br />132,000 af per year of water per year conserved by lining the <br />Coachella Canal as replacement for the additional water released from <br />storage to meet delivery obligations to Mexico. However, the conserved <br />water has not been sufficient to completely replace the additional <br />releases required. Irrigation drainage has exceeded 132,000 af by <br />5,900, 6,000, and 13,000 af in calendar years 1989, 1990 and 1991, <br />respectively; therefore, a total of about 24,900 af of releases in <br />excess of the 132,000 af have been required. <br /> <br />UNUSED APPORTION"ENT AVAILABLE <br /> <br />At the time of authorization, it was intended that the water savings <br />resulting from the Coache11a Canal lining would be available as a <br />replacement water supply while the Desalting Plant was under <br />construction. Further, the 1974 Act recognized that the conserved water <br />ultimately belonged to water users in California and would only be <br />avai1ab1e"to the United States as long as water demand in the Lower <br />Basin was less than the 7.5 million af apportioned for annual use during <br />normal water supply years. The 1974 Act, therefore, provided that the <br />interim period end when California's requested water supplies are unable <br />to be satisfied because use in the Lower Basin has reached its maximum <br />annual apportionment. <br /> <br />Arizona's and Nevada's unused apportionment of Colorado River water will <br />likely continue to be available to meet California water needs: Because <br />the Central Arizona Project (CAP) water use has been much less than <br />projected, unused Arizona apportionment could continue to be available, <br />at least for the next few years and possibly longer, to meet <br />California's requests for water. <br /> <br />15 <br />