WSP04195

• File Number: 8282.600.10
• Description: Colorado River Operating Annual Reports
• Basin: Colorado Mainstem
• Date: 1/1/1973
• Author: USDOI/BOR
• Title: Operation of the Colorado River Basin 1973 Projected Operations 1974
• Water Supply Pro - Doc Type: Publication

lower Basin Requirements

MEXICAN TREATY OBLIGATIONS

Annual calendar year schedules of monthly
deliveries of water in the limitrophe section
of \he Colorado River, allotted in accordance
with the Mexican Water Treaty of 1945, are
formulated by the Mexican Section and pre-
sented to the International Boundary and
Water Commission before the beginning of
each calendar year. Mexico has the right,
upon 30 days' notice in advance to the
United States Section, to modify, within the
total schedule, any monthly quantity prescribed
by the schedule by not more than 20 percent of
the monthly quantity. In addition to the 1.5
million acre-foot minimum Treaty requirement,
approximately 118,000 acre-feet are projected
for delivery pursuant to Minute No. 242 and
approximately 5,000 acre-feet are projected in
regulatory waste. The total delivery to Mexico
for water year 1973 is estimated to be 1,623,000
acre-feet.
CONSUMPTIVE USE AND LOSS REQUIRE-
MENTS

A release of 6,867,000 acre-feet from lake
Havasu has been projected for water year 1974
including 5,244,000 acre-feet to meet cOn-
sumptive use requirements in the United States
below Parker Dam, transit losses in the river
between Parker Dam and the Mexican Border,

Imperial Dam and desilting works, Arizona-California
and a 1,623,000 acre-foot delivery to Mexico.
The Metropolitan Water District af South-
ern California is expected to divert
1,212,000 acre-feet by pumping from lake
Havasu. Consumptive uses by small users,
river losses or gai ns, and reservoir losses be-
tween Davis Dam and Parker Dam are projected
to be 302,000 acre-feet for water year 1974.
There are na major userS between Hoover
Dam and Davis Dam. Consumptive uses by
small users, rive, losses 0' gains, and reser-
voir losses between Hoover Dam and Davis
Dam are projected to be a net loss of
136,000 acre-feet for water year \974.
The net diversians from lake Mead are
projected at 80,000 acre-feet for water year
1974. Evaporation from Lake Mead is expect-
ed to be about 854,000 acre-feet, and tribu-
tary inflow between Glen Canyon Dam and
Lake Mead is expected to be abaut 880,000
acre-feet.
REGULATORY WASTES
A regulatory waste of 5,000 acre-feet
has been projected as being lost from the
Lower Colorado River for water year 1974
as indicated in the sectian under Mexican
Treaty obligatians.
The guides set forth in the Report on
Reservoir Regulations for Flood Control
Storage at Hoover Dam and lake Mead are
in effect, but no flood control releases are
anticipated for water year 1974.

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