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<br />Beneficial Consumptive Uses
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<br />Checking irrigation water
<br />
<br />Upper Basin Uses and losses
<br />The three largest 'Sources o~ consumptive
<br />use in the Upper Colorado Basin are
<br />agricultural use within the drainage basin,
<br />diversion to adjacent drainage systems,
<br />and evaporation losses. During water
<br />year 1980, the estimated use for agricul-
<br />ture and municipal and industrial supply
<br />in the Upper Basin was 2,299,000 acre-
<br />feet. Estimated evaporation losses were
<br />700,000 acre-feet from mainstem reser-
<br />"airs plus 160,000 aCTe-1ee' horn other
<br />reservoirs and stockponds. Approximately
<br />640,000 acre-feet were diverted for use
<br />in adjacent drainage basins. Thus, total
<br />estimated consumptive use amou nted to
<br />3,790;000 acre-Ieet. '
<br />
<br />\bout 2.4 million acre-feet of water were
<br />Idded to storage In Upper Basin main-
<br />tern reservoirs during 1980. This water
<br />lilI be released to the Lower Bas.ln in
<br />Jture years as required by the Colorado
<br />ti"er Project Ad and the laws, compacts,
<br />nd treaties upon which the operating
<br />riteria were promulgated pursuant to
<br />eC, 602(a) of the Act.
<br />
<br />Lower Basin Uses and Losses
<br />During water year 19BO, an estimated
<br />9,413,000 acre-feet of water were released
<br />from lake Havasu to meet the req uire.
<br />ments for water deliveries at Imperial
<br />Dam, as well as those of the Colorado
<br />River Indian Reservation near Parker,
<br />Ariz., the Palo Verde Irrigation District
<br />near Blythe, Calif., other miscellaneous
<br />users ()/ong the river, the anticipatory re-
<br />leases and transit losses between Parker
<br />Dam and Imperial Dam.
<br />
<br />The major water diversion above Parker
<br />Dam was by The Metropolitan Water Dis-
<br />trict (MWD) Of Southern California, MWD
<br />pumped 818,000 acre-feet from lake
<br />Havasu during water year 1980, which
<br />included 3,500 acre-feet for delivery to
<br />the City of Tijuana pursuant to a contract
<br />for temporary emergency delivery of a
<br />portion of Mexico's Treaty entitlement.
<br />
<br />
<br />Citrus Grove
<br />
<br />During water year 1980, releases of
<br />approximately 10,246,000 acre-feet were
<br />made from Lake Mohave to provide for
<br />releases at Parker Dam; to supply diver-
<br />sion requirements of the MWD, miscella-
<br />neous contractors, and other users; to
<br />offset evaporation and other transit losses
<br />between Davis and Parker Dams; and to
<br />maintain the scheduled levels of Lake
<br />Havasu.
<br />
<br />During water year 1980, releases of ap.
<br />proximately 9,958,000 acre-feet were
<br />made from Lake Mead at Hoover Dam to
<br />regulale Ihe levels of Lake Mohave and
<br />to provide for the small uses and the
<br />losses from this reservoir. In addition,
<br />123,000 acre-feet were diverted from La\t.~
<br />Mead for use by Lake Mead National
<br />Recreation area, Boulder City, Basic
<br />Management. Inc., and contractors of the
<br />Division of Colorado River Resources.
<br />State of Nevada. During water year 1980
<br />the total releases and diversions from
<br />La.e Mead were an estimated 10,081,000
<br />acre-feet. This amount included the antiCI-
<br />patory releases discussed elsewhere in
<br />this r~port
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