<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 />
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