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<br />lower Basin Reservoirs
<br />lake Mead (Colorado River)
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<br />Hoover Dam
<br />
<br />Water Year 1980
<br />At the beginning of water year 1980, Lake
<br />Mead, impounded by Hoover Dam, had
<br />a water surface elevation of 1,195 feet
<br />and an active storage of 22,242,000 acre-
<br />feet. During the water year. releases were
<br />made to meet downstream water use
<br />requirements in the United States and
<br />Mexico, programmed levels of Lakes
<br />Mohave and Havasu. and transit losses
<br />which include river and reservoir evapo-
<br />ration, uses by phreatophytes, changes
<br />in bank storage, unmeasured inflows, and
<br />diversions. (As mentioned earlier in this
<br />report, a.dditional anticipatory releases
<br />totaling 3,059,000 acre-feet were made
<br />from Hoover Dam and downstream reser-
<br />voirs during water year 1980 in order to
<br />decrease the magnitude of flood control
<br />releases during 1981 and 1982), The lolal
<br />release trom Lake Mead through Hoover
<br />Dam during water year 1980 was' an esti-
<br />mated 9,958,000 acre-feel, At Ihe end of
<br />the water year, Lake Mead had a water
<br />surface elevation of 1,205 feet and an
<br />acti\le storage 01 23,S37,\)OO acre-teet,
<br />which reflect an increase in storage
<br />during the water year of 1,395,000
<br />acre-feet.
<br />
<br />On September 30, 1980, the active stor-
<br />age of Lake Mead was 553,000 acre-feet
<br />more than the active storage of Lake
<br />Powell,
<br />
<br />18
<br />
<br />
<br />Lake Mead Recrea.tion
<br />
<br />Waler Year 1981
<br />During the 1981 water year, the Lake
<br />Mead water level is scheduled to rise to
<br />elevation 1,207 feet at the end of Febru-
<br />ary 1981, then be drawn down to a low
<br />elevation of 1,197 teet at the end of June
<br />1981, At that level the lake will have an
<br />average active storage of about 22.4
<br />million acre-feet. During water year 1981
<br />a total of 10 million acre-feet is scheduled
<br />to be released from Lake Mead. This
<br />release will exceed downstream require-
<br />ments while at the same time meet com-
<br />pact requirements and existing operating
<br />criteria. A!Lreleases are scheduled to
<br />pass through the turbInes for electric
<br />power production.
<br />
<br />With an upper quartile inflow to the sys-
<br />tem's reservoirs, it is anticipated that
<br />instantaneous peak discharges from
<br />Hoover, Davis, and Parker Dams would
<br />not be greater than normal year peaks;
<br />however, sustained discharges may pose
<br />minor problems in the United States por-
<br />tion of the Lower Basin and more signifi-
<br />cant problems within the Republic of
<br />Mexico.
<br />
<br />Lake Mead Active Storage'
<br />Reservoir (Acre-Feet)
<br />
<br />Ma~imU1l\ Slorage
<br />Rated Head
<br />Minimum Power
<br />Surface Area (Full)
<br />Reservoir Length
<br />(Full)
<br />Power Plant
<br />
<br />Number of Units
<br />Tolal Capacily
<br />
<br />Chari 6
<br />
<br />EL
<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 />17
<br />1,344,800 Kilowatts
<br />
<br />'does not include 2,378,OOOacre.leel 01 dea.d
<br />,lorage below ~5 leel
<br />
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