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<br />
<br />Upper Basin Uses and Losses
<br />The three largest categories of consump-
<br />tive use in the Upper Colorado River
<br />Basin are agricultural uses within the
<br />. basin, transbasin diversions to adjacent
<br />drainages, and evaporation losses from
<br />the major reservoirs of the Colorado River
<br />System. During water year 1985, the
<br />estimated use for municipai and industrial
<br />suppiy and for agriculture in the Upper
<br />Basin was 1 ,900,000 acre-feet. Estimated
<br />evaporation losses were 740,000 acre-
<br />feet from mainstem reservoirs. About
<br />663,000 acre.feet was diverted for use in
<br />adjacent drainages. Total estimated
<br />consumptive use amounted to 3,300,000
<br />acre.feet. Storage in the Upper Basin
<br />mainSlem reservoirs decreased by
<br />approximately 2,200,000 acre-feet during
<br />water year 1985.
<br />
<br />Lower Basin Uses and Losses
<br />During water year 1985, an estimated 4.6
<br />maf of water were released from Lake
<br />Havasu to meet the requirements for
<br />water deliveries at Imperial Dam, as well
<br />as those of the Colorado River Indian
<br />Reservation near Parker, Arizona, the
<br />Palo Verde Irrigation District near Blythe,
<br />California, other miscellaneous users
<br />along the river, and transit. losses
<br />between Parker Dam and Imperial Dam.
<br />
<br />The major water diversion above Parker
<br />Dam was by MWD. MWD pumped
<br />approximately 1,260,000 acre.feet from
<br />LaKe Havasu during water year 1985.
<br />
<br />Releases of approximately 5.6 maf were
<br />made from LaKe Mohave during waler
<br />year 1985, to provide for releases at
<br />Parker Dam; to supply diversion require-
<br />ments of MWD, miscellaneous contrac.
<br />tors, and other users; to offset evaporation
<br />and other transit losses between Davis
<br />and Parker Dams; and 10 maintain the
<br />scheduied levels of Lake Havasu.
<br />
<br />During water year 1985, releases of
<br />approximately 5.6 maf were made from
<br />Lake Mead at Hoover Dam to regulate
<br />the ievels of Lake Mohave and to provide
<br />for the small users from that reservoir,
<br />and to provide for releases at Davis Dam.
<br />In addition, 162,000 acre-feet were
<br />diverted from Lake Mead for use by the
<br />LaKe Mead National Recreation Area,
<br />Boulder City; Basic Management, Inc.;
<br />and contractors of the Colorado River
<br />Commission of Nevada. Total releases
<br />and diversions from Lake Mead during
<br />water year 1985 were an estimated
<br />18,798,000 acre-feet.
<br />
<br />For water year 1986, a total release 01
<br />10.9 maf from Lake Havasu has been
<br />projected, including consumptive use
<br />
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<br />Lelluce Under Irrigation
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<br />requirements in the United States below
<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. All of the
<br />amount projected woutd pass through the
<br />Parker Powerplant.
<br />
<br />During water year 1986, MWD is
<br />expected 10 divert 1,250,000 acre-feet by
<br />pumping from Lake Havasu. Consumptive
<br />uses by small users, river losses or gains,
<br />and reservoir tosses between Davis Dam
<br />and Parker Dam are projected to be a
<br />net loss of 139,000 acre.feet.
<br />
<br />There are no major users between
<br />Hoover Dam and Davis Dam. During
<br />water year 1986 the net diversions from
<br />Lake Mead are projected at 141,000
<br />acre.feet. Evaporation from Lake Mead is
<br />projected to be about 965,000 acre.feet
<br />and net gain between Glen Canyon Dam
<br />and Lake Mead is expected to be about
<br />884,000 acre-feet.
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