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<br />Lower Basin Reservoirs <br />Lake Mead [Colorado RiverJ <br /> <br /> <br />"."<'.." <br />.'~, <br />.~~~,',. <br />",~""":<r"t <br />'<\~:......o..~.""~. <br />Spilling at Hoover Dam. <br /> <br />Watar Vear 1883 <br />At the beginning of water year 1983, Laka <br />Mead, Impounded by Hoover Dam, had a <br />water surface elevation of 1199 feet and an <br />acllve .torage 0122,773,000 acre-feel. During <br />the winter and spring months the water level <br />gradually ro.e to 1212 feet by the end of May <br />1983. During the high Inflow condition. of <br />June and July, Lake Mead reached a high <br />elevation of 1225.8 feet near the end of July, <br />with a peak active .torage of 26,864,000 <br />acre-feet. <br /> <br />During the water year, releases were made to <br />meet downstream water use reqUirements In <br />the United State. and Mexico, flood control <br />requirements, programed level9 of Lakes <br />Mohave and Havasu. and transit losse9 which <br />Include river and reservoir evaporation, uses <br />by phreatophyte., change. In bank .toraga, <br />unmeasured Inflows. and diversions. The <br />total relesss from Lake Mead through Hoover <br />Dam during watsr year 1983 was <br />approximately 14,755,000 acre-feet. Of Ihet <br />amount, approximately 12,653,000 acre-feet <br />passed through the turbInes for power <br />production. At the end of the water year, Lake <br />Mead had a water surface elevation of 1218 <br />leet and an active .torage of 25,658,000 <br />acre-teet which reflectll an Increase In storage <br />luring the weter year 012,885,000 acre-feet. <br />)n September 30,1983, the active .torage of <br />~ake Mead was 841 ,000 acre-feet greater than <br />he active storage In Lake Powell. <br /> <br />18 <br /> <br /> <br />Turbin. runner being lowered'to Hoover Powerplllnt. <br /> <br />Walar Vaar 1984 <br />Under average Inflow condItions during the <br />1984 water year, the Lake Mead water level Is <br />scheduled to be drawn down to elevation 1212 <br />feet atlhe end of February 1984, then be <br />drawn down to a low elevation of 1207 feet at <br />the end 01 June! 984. At that level, the lake <br />will have In active storage about 23.9 million <br />acre-feet. During water year 1984, a total of <br />about 15.8 million acre-feet Is scheduled to be <br />released from Lake Mead, all passing through <br />the powerplant. <br /> <br />Lake Mead Active Storage" <br />Reservoir (Acre.Feet) <br /> <br />Maximum Storage <br />Rated Head <br />Minimum Power <br />Surface Area (Full) <br />Reservoir Length <br />(Full) <br /> <br />Power Plant <br />Number of Units <br />Total Capacity <br /> <br />Chart 6 <br />EI. <br />(Ft.) <br /> <br />27,377,000 1229 <br />13,653,000 1123 <br />10,024,000 1083 <br />162,700 Acres <br /> <br />115 Miles <br /> <br />.does !'\at (nelude 2,378,000 acre-Ieel ot dead <br />IUorage below 895 leet <br /> <br />17 <br />1,344,800 Kilowatts <br />