WSP01659

• File Number: 8282.600.10
• Description: Colorado River Operating Annual Reports
• Basin: Colorado Mainstem
• Date: 1/1/1974
• Author: USDOI/BOR
• Title: Operation of the Colorado River Basin 1974 Projected Operations 1975
• Water Supply Pro - Doc Type: Publication

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Lower Basin Requirements

MEXICAN TREATY OBLIGATIONS

Annual calendar year schedules of
monthly deliveries of water in the Iimitrophe
section of the Colorado River, allotted in
accordance with the Mexican Water Treaty
signed in ] 944, are formulated by the Mexican
Section and presented to the International
Boundary and Wate( 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 210,000
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 1975
is ~stimaie-d to-ileul,715,OOO acre-feet..' -

CONSUMPTIVE USE AND LOSS REQUIRE-
MENTS

A release of 7,037,000 acre-feet from
Lake Havasu has been projected for water year
1975 induding 5,413,000 acre-feet to meet
consumptive use requirements in the
United States below Parker Dam, transit losses
in the river between Parker Dam and the

Imperial Dam and desilting works. Arizona-California

Mexican Border, and a 1,715,000 acre-foot
delivery to Mexico.
The Metropolitan Water District of
Southern California is expected to divert
879,000 acre-feet by pumping from Lake
Havasu. Consumptive uses by small users, river
losses. or gains, and reservoir losses between
Davis Dam and Parker Dam are projected to
be 269,000 acre-feet for water year 1975.
There are no major users between Hoover
Dam and Davis Dam. Consumptive uses by
small users, river losses or gains, and reservoir
losses between Hoover Dam and Davis Dam are
projected to be a net loss of 145,000 acre-feet
for water year 1975.
The net diversions from Lake Mead are
projected at 96,000 acre-feet for wa ler year
1975. Evaporation from Lake Mead is expected
to be about 833,000 acre-feet, and tributary
inflow between Glen Canyon Dam and Lake
Mead is expected to be about 320,000
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 1975 as
indicated in the section under Mexican Treaty
obliga tions.
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 1975.

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