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<br />
<br />Well preparatlan pnar ta pumpaul test.
<br />
<br />Upper Balin USM and Losle.
<br />During 1984
<br />
<br />The three largest sources of consumptive
<br />use in the Upper Colorado River Basin are
<br />agricultural use within the basin, transbasin
<br />diversions to adjacent drainages, and
<br />evaporation losses from the major
<br />reservoirs of the Colorado River System.
<br />During water year 1984, the estimcned use
<br />for municipal and industrial supply and for
<br />agriculture in the Upper Basin was
<br />2,SOO,ooc:l acre-feet. Estimated evaporation
<br />losses were 752,000 acre-feet from
<br />main stem reservoirs. About 584,000 acre-
<br />feet ,was diverted, for_use _in_ adjacent
<br />drainages. Total estimated consumptive
<br />use, therefore, amounted to 3,836,00Cl acre-
<br />feet. Storage in the Upper Basin mainstem
<br />reservoirs decreased by approximately
<br />392,000 acre-feet during water yeor 1984:
<br />
<br />Lower Balin U... and Loue.
<br />
<br />During water year 1984, an estimated
<br />5,063.000 acre-feet of water were released
<br />from lake Havasu to meet the
<br />requirements for water deliveries at
<br />Imperial Dam, as we!1 as those of the
<br />Colorado River Indian Reservation near
<br />Porker, Arizona, the Polo Verde Irrigation
<br />District near Blythe, California, other
<br />miscellaneous users along the rivero, and
<br />transit losses between Parker Dam and
<br />Imperial Dam.
<br />
<br />
<br />Agricultural water use in the Phoenil( area.
<br />
<br />The major water diversion above Porker
<br />Dam was by The Metropolitan Water
<br />District of Southern California (MWD).
<br />MWD pumped approximately 1,196,000
<br />acre.feet from lake Havasu during water
<br />year 1984. None of this water was used
<br />for delivery to the City of Tijuana. although
<br />the contract for temporary emergency
<br />delivery of a portion of Mexico's treaty
<br />entitlement is still in existence. During
<br />water year 1984, releases of approximately
<br />6,349,00Cl acre-feet were made from lake
<br />Mohave to provide for releases at Porker
<br />Dam; to supply diversion requirements of
<br />MWD, miscellaneous contractors, and other
<br />users; .to_offset_evaporation_and _other.
<br />transit losses between Davis and Parker
<br />Dams; and to maintain the scheduled levels
<br />of lake Havasu.
<br />
<br />During water year 1984, releases of
<br />approximately 6,149,000 acre-feet were
<br />made from lake Mead at Hoover Dam to
<br />regu late the levels of lake Mohove and to
<br />provide for the small users from that
<br />reservoir, and to provide for releases at
<br />Davis Dam. In addition, 149.000 acre.feet
<br />were diverted from lake Mead for use by
<br />the lake Mead National Recreation Area,
<br />Boulder City, Basic Management, Inc., and
<br />contractors of the Division of .Colorado River
<br />Resources, in Nevada. During water year
<br />1984, the total releases and diversions from
<br />lake Mead were an estimated 22,359,000
<br />acre-feet.
<br />
<br />For water year 1985, 0 total release of 13.3
<br />million acre-feet from lake Havasu has
<br />been projected, including consumptive use
<br />requirements in the United States be/ow
<br />Parker Dam, transit losses in the river
<br />between Parker Dam and the Mexican
<br />Border, flood control requirements, and
<br />treaty deliveries to Mexico. Of the total
<br />projected, 11.5 million acre-feet would pass
<br />through the Parker Powerplant and
<br />approximately 1.B million acre-feet would
<br />have to bypass the powerplant.
<br />
<br />During water year 1985, MWD is expected
<br />to divert 1,258,000 acre-feet by pumping
<br />from lake Havasu. . Consumptive uses by
<br />small users, river losses or gains, and
<br />reservoir losses between Davis Dam and
<br />Porker Dam are proi~cted to be a net loss
<br />of J 60,000 acre.feet.
<br />
<br />There are no major users between Hoover
<br />Dam and Davis Dam. During water year
<br />1985 the net diversions from lake Mead
<br />are projected at 141,000 acre.feet.
<br />Evaporation from lake Mead is projected to
<br />be about 1,022,000 acre.feet and net gain
<br />between Glen Canyon Dam and lake Mead
<br />is expected to be about 902,()(X) acre-feet.
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