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<br />-.., <br /> <br />,',,', \ <br />0JJ. <br /> <br />, <br /> <br />Acre-feet <br /> <br />Total Upper Basin Depletions <br /> <br />2,446,000 <br />642,000 <br />700,000 <br /> <br />3,788,000 <br /> <br />Inbasin Depletions <br />Transbasin Diversions <br />Reservoir Evaporation <br /> <br />Table 6 shows diversions less measured return flows for the <br />major water users in the Lower Basin during the past five calendar <br />years. As can be seen, Lower Basin use during 1980 was 51,000 acre- <br />feet less tha~ the previous year's use. <br /> <br />Table 7 shows the annual deliveries to Mexico since 1971 and <br />includes data on both total excess deliveries to Mexico and deliveries <br />which are in excess of control schedules. These weekly control schedules <br />of deliveries to Mexico are made up of estimated return flows from the <br />settling basins and river regulation, and additional releases required <br />from upstream storage. The releases from upstream storage are normally <br />held to the minimum necessary for the sum of all deliveries to meet the <br />United States' commitments for water delivery pursuant to the Mexican <br />Water Treaty and the Minutes of the International Boundary and Water <br />Commission. However, again in 1980, large amounts of water in excess <br />of the Treaty requirements were delivered to Mexico as a result of <br />controlled flood releases from the normally dry Gila River into the <br />Colorado River below Imperial Dam (1,843,000 acre-feet), and because <br />of the release of close to 3.5 million acre-feet of extra water from <br />Hoover Dam for anticipatory flood control operations. <br /> <br />-6- <br />