WSP07757

• File Number: 8220.100.40
• Description: CRSP
• Basin: Colorado Mainstem
• Date: 1/16/1958
• Author: USDOI
• Title: First Annual Report on the Statuts of the Colorado River Storage Project
• Water Supply Pro - Doc Type: Annual Report

REPOWl' ON ~LOItA.DQ J;t1VER S'l10RA.GE. PROJ]J{)T 9

The item of "unacbounted-for water" consists of the average
amount necessary to bb placed algebraically in the hydrologIC equa-
tionin order to balance }hat equationUrider the conditions encountered
during the operating !y:ears 1951-56. It. includes reservoir losses,
channel losses, impouI1dment and recovery of bank storage, inflow
from tributary streamsl unmeasured diversions, unmeasured returns,
and errors in stream-1!low measurements. The amount is 508,000
acre-feet, which is the tverage of the annual amounts shown in table
IV. , .
It is estimated that by the year 1970 demands will be made upon
Lake Mead to meet downstream uses in the United States and Mexico
to the extent of about 6,900,000 acre-feet; the derivation of this esti-
mate is shown on tablelV. By use of this figure, it is not ij1tended to
imply that this figure tepresents the legal bounds of permissible use'"
under the law of the river. .
TABLE V

{In thousands 01 acre-feet]
Arizona uses: .
, Colorado River Indian. Reservation, 100,000 acres at 4: acre-feet per
acre_____________~------------------------------------_____ 400
Yuma Valley, 48,000 ftcres at.4 acre-feet per acre~_________________ 192
Unit B, 3,300 acres attlO acre-feet per 801'6_______________________ 33

Gila project____ - -- -- i- __ _ _ _ _ _ __ _ _ _ ____ __ _ __ __ _ _ __ _ ___. -___ --- - 600
Subtotal, Al'izona__L________________________________________ 1,225
California uses. _ ________J_______________________________________.-- 5,362
~evadauses____________~-------------------------------__________ 46
i
SubtotaL___ _ _ __ _ _j_ __ _ _ __ __ _ __ __ __ _ _ _ _ _ __ __ __ _ __ __ __ __ __ __ _ 6, 633
Unaocounted for water, Ho;over Dam to boundary_____________________ 508
Water at the Mexican bou1?dary____________________________________~ 1,762
, -
Total____________i____________________"____________________ 8,903

OPERATI?N OF LAKE MEAD FOR POWER

Firm power from th'j Boulder Canyon project is defined under the
Hoover Dam power con.tracts as 4,330 million kilowatt-hours annually
'with a diminution of 8.116 million kilowatt-hours annually after operat-
ing year ending M,,:y 3~, 1938. In years ,?f high runoff, when excess
flow would be aVailable and the reservoir nearly full, such excess
flow may be used for th~ generation of secondary energy. During the
immediate past few yeltrs, due to severe drought and low reservoir
content, some shortage$ have occurred in the firm-energy generation,
It is estim. atedthat by jl.priI1., 1958, the active cont. ep.t of Lake Mead
will be ahout 20 millioq .acre-feet. .
Table VI summarizes; the operations of Lake Mead and Glen Canyon
Reservoirs, under the *emises adopted for these studies, during the
years 1958-70, inclusiv~.

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