WSP11484

• File Number: 8281.400
• Description: Colorado River Studies and Investigations -- Colorado River Depletion Projections
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 2/13/1963
• Title: Estimates of Average Annual Depletions in the Upper Colorado River Basin and Related Data -- 1910 - 2000
• Water Supply Pro - Doc Type: Report/Study

,',l

Source of Infonnation and Supplementary notes
for
Attachment A
. (Unless indicated otherwise, all citations are to
U.S. Bureau of Reclamation neports)

fJ'
~
Q Item No.

1 Thru 3. Hearings on HR 2206, B7th Cong., p. 83.

4 Thru 7. Financial and 1conomic Analysis, Colorado River Storage
Project and Participating Projects (Dec.195B) CFtSP Analysis
3nd $enate Hearings for Public \forks appropriations, 1963
Assumed herein that full depletion on the relatively smell projects
would take place upon completion of construction or in the same
year after the irrigation plant is scheduled to be in service.
On the larger projects (item 12 & 21), it is assumed that deple-
tionsl.'ill start when part of the irrigation plant is in service
I.dth a straij!,ht increase to full depletion by the year that
irrigators are scheduled to start making maximum payments.

B 2nd 9. Based on completion dates given in the .:.,encte Hearings on
Public Yorks hppropriations, 1963; and upon averace annual losses
Kiven in the CRSP Analysis, p.13 as follows; Navajo losses of
39,000 fl.F./Yr. starting in 1963, Flaming Gorge losses of 62,000
A.F./Yr. starting in 1964 and Curecanti losses of 14,000 A.F./Yr.
starting 1967.

10 thru 12. (See note for item 4 thru 7)

13.

Reservoir evaporation losses at minimum power operating level vmuld
be about 300,000 A.~'./Yr. (based on an assumed evaporation rate of
5.0 re/yr).
Evaporation losses at norm81 operating level would be 576,000 A.Fj
Yr. (See GhSP Analysis, p. 12)'
Depletion schedule herein is based on the following assumptions:
a. Glen Canyon reservoir filling would begin in
the spring of 1963.
b. Reservoir would be at minimum power operating level
of 6.5 M.A.F. by end of 1964.
c. Reservoir ,iOuld fin to normal operatin[: level by 19$2.
d. A straight line increase in evaporation losses between
1964-82.

14.

Hearings on h.H. 2206, 87th Cong.,p.B3 (Blue "iver bettlement)
i'Bsumea straiFht line depIction increase between 1963-2000.

Hearings on H.R. 2352, h.J(. 2494 and S.72, B6th Cong., p.7S.
Assumed strairht line depletion increase bet~een 1963-69.

16. HearinGs on H. 11. 2352, B6th Conr;., p. 78. Assumed herein on
basis of construction schedule that depletions would begin in
1966 and increase on a straight line basis to full depletion
in 1970.

15.

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