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<br />Lower Basin Uses and Losses
<br />
<br />During water year 1977, releases of 6,714,000
<br />acre.feet of water from Lake Havasu were made to
<br />meet the requirements for water deliveries at 1m.
<br />perial Dam, as well as those of the Colorado River
<br />Indian Reservation near Parker, Ariz" the Palo
<br />Verde Irrigation District near Blythe, Calif., other
<br />miscellaneous users along the river, and transit
<br />losses between Parker Dam and Imperial Dam, De.
<br />liveries to Mexico consisted of river water delivered
<br />to Imperial Dam and waste and drainage return
<br />flows irom water users below Imperial Dam. Bene.
<br />iicial use of the small amount of regulatory stor.
<br />age space in Imperial, Laguna, and Senator Wash
<br />Reservoirs resulted in limiting the regulatory waste
<br />to 68,501 acre.feet.
<br />
<br />The major water diversion above Parker Dam was
<br />by Metropolitan Water District (MWD) of southern
<br />California, MWD pumped 1,085,000 acre-feet irom
<br />Lake Havasu during water year 1977, which in.
<br />eluded 9,655 acre-feet for delivery to the city of
<br />Tijuana, pursuant to a contract for temporary emer.
<br />gency delivery of a portion of Mexico's treaty en.
<br />titlement. The higher diversions by MWD were ne-
<br />
<br />cessitated by the severe drought in California, Dur.
<br />ing water year 1977, releases of 8,042,000 acre-
<br />feet were made from Lake Mohave to provide for
<br />releases at Parker Dam; to supply diversion require.
<br />ments of the MWD, miscellaneous contractors, and
<br />other users; to offset evaporation and other tran-
<br />sit losses between Davis and Parker Dams; and to
<br />maintain the scheduled levels of Lake Havasu,
<br />
<br />During water year 1977, releases of 7,562,000
<br />acre-feet were made from Lake Mead at Hoover
<br />Dam to regulate the levels of Lake Mohave and
<br />to provide for the small uses and the losses from
<br />this reservoir, In addition, 89,760 acre-feet were
<br />diverted from Lake Mead for use by Lake Mead Na-
<br />tional Recreation Area, Boulder City, Basic Man-
<br />agement, Inc., and contractors of the Division of
<br />Colorado River Resources, State of Nevada, Dur-
<br />ing water year 1977, the total releases and diver-
<br />sions from Lake Mead were 7,651,800 acre-feet.
<br />
<br />Lower Basin consumptive uses and losses for the
<br />5.year period ending in 1975, as published in the
<br />"Colorado River System Consumptive Uses and
<br />Losses Report" were as follows:
<br />
<br />Year Mainstream I Tr'ibutaries' Lower Basin Water passing
<br /> total to Mexico
<br /> (1,000 acre. feet)
<br />1971.. . 7,795 3,759 11,554 1,561
<br />1972. ......... 7,959 4,096 12,055 1,600
<br />1973. .......... 7,766 4,267 12,033 1,594
<br />1974. . ........ 8,315 4,470 12,785 1,721
<br />1975. .......... 7,693 4,482 12,175 1,656
<br />
<br />I Includes reservoir and channel losses.
<br />~ Includes uses supplied from ground water overdraft.
<br />
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