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<br />Lower Basin Requirements <br /> <br />Mexican Treaty Obligations <br /> <br />Annual calendar year schedules of monthly deliver. <br />ies of water in the limitrophe section of the Colo- <br />rado River, allotted in accordance with the Mexi- <br />can Water Treaty signed in 1944. are formulated <br />by the Mexican Section and presented to the United <br />States Section, International Boundary and Water <br />Commission, before the beginning of each caiendar <br />year, <br /> <br />Upon 30 days' advance notice to the United States <br />Section, Mexico has the right to madify, within the <br />total schedule, any monthly quantity prescribed by <br />the schedule by not more than 20 percent of the <br />monthly quantity. In addition to the 1.5 million <br />acre-feet of scheduled Treaty deliveries, approxi. <br />mately 15,000 acre-feet are projected for regula- <br />tory wastes and approximately 206,000 acre-feet <br />of Wellton-Mohawk drainage water will be bypassed <br />around Morelos Dam, Mexico's diversion structure, <br />pursuant to Minute No. 242. <br /> <br />Mead is expected to be about 857,000 acre.feet, <br />and net gain between Glen Canyon Dam and Lake <br />Mead is expected to be about 879,000 acre. feet. <br /> <br />Regulatory Wastes <br /> <br />A regulatory waste of 15,000 acre-feet has been <br />projected as being lost from the Lower Colorado <br />River for water year 1978, as indicated in this <br />section under Mexican Treaty obligations. <br /> <br />The guides set forth in the "Report on Reservoir <br />Regulations for Flood Control Storage at Hoover <br />Dam and Lake Mead" were in effect, but no flood <br />control releases were necessary during water year <br />1977. <br /> <br />On June 1, 1977, the Corps of Engineers and the <br />Bureau of Reclamation entered a field working <br />agreement to permit removal of 11 of the 23 <br />needle valves and paradox gates from the Hoover <br />Dam outlet works, This field working agreement <br />outlines the flood control operations for Hoover <br />Dam and shall remain in effect until revised flood <br />control regulations are published. <br /> <br />Consumptive Uses and Losses-1978 <br /> <br />For water year 1978, a release of 6,862,000 acre- <br />feet from Lake Havasu has been praieeted, includ- <br />ing consumptive use requirements in the United <br />States below Parker Dam, transit losses in the river <br />between Parker Dam and the Mexican Border, and <br />Treaty deliveries ta Mexico, <br /> <br />During water year 1978, the Metropolitan Water <br />District of Southern California is expected to divert <br />1,297,800 acre-feet by pumping from Lake Havasu, <br />including a contract delivery .of 8,800 acre-feet to <br />the city of Tijuana as a part of Mexico's Treaty <br />delivery. <br /> <br />Consumptive uses by small users, river losses or <br />gains, and reservoir losses between Davis Dam and <br />Parker Dam are projected to be 382,000 acre.feet, <br /> <br />There are no major users between Hoover Dam <br />and Davis Dam, During water year 1978, consump. <br />tive uses by small users, river losses or gains, and <br />reservoir losses between Hoover Dam and Davis <br />Dam are projected to be a net gain of 74,000 acre- <br />feet. The net diversions from Lake Mead are pro- <br />jected at 103,000 acre. feet. Evaporation from Lake Boating on Lake Powell. <br /> <br /> <br />31 <br />