|
<br />Beneficial Consumptive Uses
<br />
<br />,,;:-,,'
<br />
<br />
<br />.....;:,.":Zf,.,....,... ~.-. '.-~'
<br />, .
<br />
<br />-',
<br />
<br />...~~
<br />
<br />:-::.'>^-~.
<br />
<br />.~
<br />
<br />
<br />Center pivot sprinkler irrigation system.
<br />
<br />Upper Basin Uses and losses
<br />The three largest sources of consumptive use
<br />in the Upper Colorado Basin are agricultural
<br />use within the drainage basin, diversion to
<br />adjacent drainage systems, and evaporation
<br />losses, During water year 1981, the estimated
<br />use lor agricultural and municipal and
<br />industrial supply in the Upper Basin was
<br />2.441.000 acre-feet. Estimated evaporation
<br />losses were 686,000 acre-feet from mainstem
<br />reservoirs, Approximately 713,000 acre-teet
<br />were diverted for use in adjacent drainage
<br />basins. Thus, total estimated consumptive use
<br />amounted to 3,840,000 acre-teet. Storage in
<br />the Upper Basin mainslem reservoirs
<br />decreased by approXImately 3.2 million acre-
<br />feet during water year 1981,
<br />
<br />lower Basin Uses and lossas
<br />During water year 1981, an estimated
<br />8.653.000 acre-feet of water were released
<br />from Lake Havasu to meet the requirements
<br />for water deliveries at Imperial Dam, as well
<br />as those of the Colorado River Indian
<br />Reservation near Parker, Ariz., the Palo Verde
<br />Irrigation District near Blythe, Calif., olher
<br />miscellaneous users along the river; and the
<br />anticipatory releases and transit losses
<br />between Parker Dam and Imperial Dam,
<br />
<br />The major water diversion above ParKer Dam
<br />was by The Metropolitan Water District
<br />(MWD) of Southern California, The MWD
<br />pumped approximately 883,000 acre-feet
<br />from Lake Havasu dUring water year 1981, In
<br />contrast with previous years, none of this
<br />
<br />24
<br />
<br />waler was utilized for delivery to the City of
<br />Tijuana, pursuant to a contract for temporary
<br />emergency delivery of a portion of Mexico's
<br />treaty entitlement. During water year' 981,
<br />releases of approximately 10.174.000 acre-
<br />feet were made from Lake Mahava to provide
<br />for releases at Parker Dam: to supply
<br />diversion requirements of The MWD,
<br />miscellaneous contractors, and other users;
<br />to offset evaporation and other transillosses
<br />bemeen Davis and Parker Dams: and to
<br />maintain the scheduled levels of Lake Havasu.
<br />
<br />During water year 1981, releases of
<br />approximately 9,825,000 acre-teet were made
<br />from Lake Mead at Hoover Dam to regulate
<br />the levels of Lake Mahave and to provide for
<br />the small users and the losses from this
<br />reservoir. In addition, 139,000 acre-feet were
<br />diverted from Lake Mead tor use by 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' 981. the total
<br />releases and diversions from Lake Mead were
<br />an estimated 9.964,000 acre-feet. This
<br />amount included the anticipatory releases
<br />discussed elsewhere in this report.
<br />
<br />For water year 1982, a release of 6,6 million
<br />acre.feet from Lake Havasu has been
<br />projected, including consumptive use
<br />
<br />"
<br />
<br />
<br />requIrements in the United States below
<br />Parker Dam, transit losses in the river
<br />bemeen Parker Dam and the Mexican
<br />Border, and treaty deliveries to Mexico.
<br />
<br />During water year 1982. The MWD is
<br />expected to divert 1 ,000.000 acre-teet by
<br />pumping from Lake Havasu. Consumplrve
<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 loss Of
<br />162,000 acre-feet.
<br />
<br />There are no major users between Hoover
<br />Dam and Davis Dam, During water year 1982.
<br />consumptive uses by small users. river losses
<br />or gains, and reservoir losses between
<br />Hoover Dam and Davis Dam are projected to
<br />be a nef gain of 177,000 acre-feet. The net
<br />diversions from Lake Mead are projected at
<br />112,000 acre-feet. Evaporation from Lake
<br />Mead is expected to be about 929,000 acre-
<br />teet and net gain bemeen Glen Canyon Dam
<br />and Lake Mead is expected to be about
<br />884.000 acre-feet.
<br />
|