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<br />Lake Havasu (Colorado River)
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<br />Parker Oam
<br />
<br />Waler Year 1980
<br />Al the beginning of water year 1960, the
<br />water level of Lake Havasu, impounded
<br />by Parker Dam, was at elevation 447 feet
<br />with an active storage of about 565,000
<br />acre-feS't. The reservoir was drawn down
<br />to approximately elevation 443 feet with
<br />an active storage of about 498,000 acre~
<br />feet in February, to provide flood control
<br />space for runoff from the drainage area
<br />between Davis and Parker Dams. The
<br />water level was then raised to approxi-
<br />mately elevation 446 feet by mid-May,
<br />From mid~May through July, the reservoir
<br />water level was maintained between 449
<br />and 447, with an active storage of about
<br />566,000 acre-teet at the end at JUiy, 'By
<br />the end at the water year Lake Havasu
<br />was drawn down to about 447 feet with
<br />an active storage of 554,000 acre-feet.
<br />
<br />During the water year, approximately
<br />9,413,000 acre-feet were released at
<br />Parker Dam, all of which passed through
<br />the turbines for power production. That
<br />amount included the additional releases
<br />from Lake Mead during the year and the
<br />flood control releases from Alamo Dam
<br />on the Bill Williams River.
<br />
<br />Space in the lop 10 feet oCLake Havasu
<br />(about 180,000 acre-feet) is reserved by
<br />the United States for control of floods
<br />and other uses, including river regulation.
<br />Normally, only about lhe top 4 feet, or
<br />77,000 acre-feet of space, have been
<br />
<br />used for this purpose since Alamo Reser-
<br />voir on the Bill Williams River has been
<br />in operation.
<br />
<br />Waler Year 1981
<br />Lake Havasu is scheduled at the highest
<br />levels consistent with the requirements
<br />for maintaining flood contm\ s?ace. "file
<br />yearly low elevation of approximately 446
<br />feet is scheduled for the Oclober through
<br />March high flood hazard period. However,
<br />a repeat Of hydrologic conditions similar
<br />to those that occurred in water year 1980
<br />could require a lower elevation to provide
<br />for river regulations and flood control
<br />space for runoff from the drainage area
<br />between Parker and Davis Dams. The
<br />yearly high of 450 feet is scheduled for
<br />the low flood hazard monlh of June,
<br />During water year 1981, a total of 9 million
<br />acre-feet is scheduled to be released
<br />from Lake Havasu to meet all downstream
<br />requirements, including the additional
<br />releases. All releases are scheduled for
<br />electric 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 />..
<br />
<br />
<br />,
<br />Core sample trom Spillway 3, Parker Dam
<br />
<br />Lake Ha.asu Active Storage'
<br />
<br />Reservoir (Acre.Feel)
<br />
<br />Maximum Storage 619,400
<br />Rated Head 619,400
<br />Minimum Power 439,400
<br />Surface Area (Full) 20,400 Acres
<br />Reservoir Length
<br />(Full)
<br />Power Plant
<br />
<br />Number of Units
<br />Total Capacity
<br />
<br />Chart 8
<br />EI.(Ft.)
<br />
<br />450,0
<br />450,0
<br />440,0
<br />
<br />35 Miles
<br />
<br />4
<br />120,000 Ki lowaus
<br />
<br />'doos IlOt lnclude 2a,6QO acre.leel 01 dead 9Ior.a{;le
<br />below 400.0 loet
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