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<br />
<br />Jpper B..ln U... .nd Lo.... Durln1l1983
<br />rhe threB largest sources of consumptive use
<br />n the Upper Colorado BasIn are agricultural
<br />188 within the draInage basin, diversion to
<br />IdJacent draInage systems, and evaporation
<br />ossas. During water year 1983, the estimated
<br />IBe for agricultural and municipal and
<br />ndustrlal supply In the Upper Basin was
<br />',469,000 acre-feet. EstImated evaporation
<br />Jsses were 751,000 acre-feet from malnstem
<br />eservolrs. Approximately 527,000 acre-feet
<br />'ere diverted for use In adjacent drainage
<br />.aslns. Thus, total estimated consumptive
<br />se amounted to 3,747,000 acre-feet. Storage
<br />"' the Upper Basin malnstem reservoirs
<br />'creased by approximately 1.6 million
<br />ere-feet during water year 1983.
<br />
<br />ower Buln U... and lo....
<br />luring water year 1983, an estimated
<br />,739,000 acre--feet of water were released
<br />.om Lake Havaau to meet the requirements
<br />If water deliverIes at Imperial Dam, as well
<br />'those at the Colorado River Indian
<br />eservatlon near Parker, Arizona. the Palo
<br />ardelrrlgatlon District near Blythe,
<br />allfornia, other miscellaneous users along
<br />18 river, and transit losses between Parker
<br />am and Imperial Dam.
<br />
<br />The ma~oT w8\er d\vers'on above Parker Dam
<br />was by The Metropolitan Water District of
<br />Southern California (District). The District
<br />pumped approximately 738,000 acre-feet from
<br />Lake Havasu during water year 1983. None at
<br />this water was utilized for delivery to the city
<br />at TIJuana, although the contract tor
<br />temporary emergency delivery of a portion of
<br />Mexico', treaty entitlement Is Millin
<br />existence. During water year ~9B3, releases
<br />of approximately 5.e million acre-feet were
<br />made from Lake Mohave to provide for
<br />releases at Parker Dam; to supply diversion
<br />requirements of the District, miscellaneous
<br />contractors, and other users; to offset
<br />evaporation and other transit losses between
<br />Davis and Parker Dams; and to maintain the
<br />scheduled levels of Lake Havaau.
<br />
<br />During water year 1983, releases of
<br />approximately 5.6 million acr&-feet were made
<br />from Lake Mead at Hoover Dam to regulate
<br />the levels of Lake MOhav& and to provide for
<br />the small users and the losses trom that
<br />reservoir. In addition, 138,000 acre--teet were
<br />diverted tram Lake Mead for use by the Lake
<br />Mead National Recreation Area, Boulder City,
<br />Basic Management, Inc., and contractors of
<br />the Division of Colorado River Resources, In
<br />Nevada. During water year 1983, the total
<br />releases and diversions from Lake Mead were
<br />an estimated 14,880,000 acre~feet.
<br />
<br />
<br />For water year 1984, a total release of 14.9
<br />million acre--feet from Lake Havasu has been
<br />projected, Including consumptive use
<br />requirements In the United States below
<br />Parker Dam, transit losses In the river
<br />between Parker Dam and the Mexican Border,
<br />flood control requirements, and treaty
<br />deliveries 10 Mexico. 01 the total projected,
<br />12.3 million acre-teet would pass through the
<br />Parker Powerplant and approximately 2.6
<br />million acre--feet would have to bypass the
<br />powerplant.
<br />
<br />During water year 1984, the District Is
<br />expacted to divert 1,014,000 acre-feel by
<br />pumping from Lake Havasu. Consumptive
<br />uses by small users, river losses or gains, and
<br />reservoir losses between Davis Dam and
<br />Parker Dam are projected to be a net lass of
<br />118,000 acre-feet.
<br />
<br />There are no major users between Hoover
<br />Dam and Davis Dam. During water year 1984
<br />the net diversions from Lake Mead are
<br />projected at 149,000 acre-teet. Evaporation
<br />from Lake mead Is projected to be about
<br />984,000 acre-feet and net gain between Glen
<br />Canyon Dam and Lake Mead Is expected to be
<br />ebout 1,024,000 acre-teet.
<br />
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