WSP04752

• File Number: 8281.960
• Description: Colorado River Studies and Investigations -- Lower Colorado Comprehensive Framework Study
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/1971
• Title: Lower Colorado Region Comprehensive Framework Study -- Main Report
• Water Supply Pro - Doc Type: Report/Study

Table A-l (Continued)
SUIIIIllIU'y' of Water Requirements s.nd Supply
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......, Total Annua.l Demand
.- 1965 19l:l0 2000 2020
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Color~do River A vailable for Use
1n Lower Colorado Region 2.63 2.25 1.33 0.90
Nation..l Obligation to
Mexican Water Treaty !y 1.80 J/ 1.80 ~
Local Water Supply 3.12 3.12 3.12 3.12
Total S;upply Available for Use
in Lowe~ Colorado Region Y 5.75 5.37 6.25 5.82
Lower C9lorado Region Depletion ~ ~ 7.26
Requirements 8.52
Regional Water Deficiency 11 0.08 1.51 1.01 2.70
llegional AUBlllentation 21 0.03 0.57 2.53
Remaining Det'iciency Y 0.08 1.48 0.44 0.17

11

ExCludes mainstream Colorado River reservoir evaporation accounted
for in the determination of availability of Colorado River water.

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y
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Excluding ground-water overdraft.

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Lack of facilities prevented utilization of the Region' s full share
of Colorado River water resulting in a ground-water overdraft of about
2.5 million acre-feet. In the future to limit the water supply defi-
ciency to that tabulated would require: distribution of the available
suppty to areas of shortage, total utilization of the resource
including recycling,and_that no allowance be made for transporting
salts from the Region.

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!y

Consists of 1.5 million acre-feet per aMlJ1I1 for delivery to Mexico
plus an estimated 0.3 million acre-feet associated losses. In
. accordance with Public Law 90-537, Section 202, "The Congress declares
that the satisfaction of the requirements of the Mexican Water Treaty
from the Colorado River constitutes a national Obligation Which shall
be the first obligation of any water augmentation project planned
pursuant to Section 201 of this Act and authorized by Congress."

2/ As. recommended in the Lower Colorado Region framework program.

Y To be supplied by ground-water overdraft.
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