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<br />
<br />Lower Basin Reservoirs
<br />
<br />Hoover Dam
<br />lake Mead
<br />I
<br />
<br />
<br />STATISTICS
<br />ACTIVE STORAGE.
<br />(ACRE. FEET) ELEVATION {FEET)
<br />27,377,000 1229
<br />lJ.6S3,OOO 1123
<br />10,024,000 1083
<br />152,70Q ACRES
<br />115MIlES
<br />
<br />RESERVOIR
<br />MAXIMUM STORAGE
<br />RATED HEAD
<br />MINIMUM POWER POOL
<br />SU~FA.CE ARE.A I,FULLI
<br />RESERVOIR LENGTH (FULLl
<br />POWER PLANT
<br />NUMBER OF UNITS
<br />TOTAL CAPACITY OF UNITS
<br />
<br />17
<br />1,344,800 KILOWATT5
<br />
<br />'dQe5 nor include 2,378,000 acre.reer af deiJd Horilge be/o,"" ~/evirlon 895 feet
<br />
<br />OUTFLOW
<br />
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<br />020
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<br />
<br />Lal:e Mead at the beginning of water year
<br />1974 had a water surface level of 1,180 feet and
<br />an active storage of 20.176,000 acre-feet. During
<br />the water year, releases were made to meet
<br />downstream water use requirements in the
<br />United States and Mexico, programed levels of
<br />Lakes Mohave and Havasu, and transillosses which
<br />include river and reservoir evaporation, useS by
<br />phreatophytes, changes in bank storage,
<br />unmeasured inflows, and diversions. The total
<br />release from Lake Mead through Hoover Dam was
<br />8,846,500 acre-feet. At the end of the water year,
<br />Lake Mead had a water surface elevation of 1,174
<br />feet and an active storage of 19,358,000 acre-feet,
<br />which retlect a decrease in storage during the water
<br />year of 818,000 acre-feet. On September 30,
<br />1974, the active storage of Lake Mead wa~
<br />1,348,000 acre-feet greater than the active storage
<br />in Lake Powell.
<br />Lake Mead is the only reservoir on the
<br />Colorado River in which a specified space is
<br />exclusively allocated for mainstream flood control.
<br />Flood control regulations have been published.
<br />These regulations take into account effective space
<br />in CRSP reservoirs as well as in Lake Mead.
<br />Space in Lake Mead and CRSP reservoirs
<br />during water year 1974 was such that no unusual
<br />Hoover releases were required to operate pursuant
<br />to provisions of the flood control regulations.
<br />(Chart 7)
<br />
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<br />MOST ADVERSE
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<br /> Waler Y~ar 1914 I Wat~f Year \975 ~ I
<br /> 14
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