WSP11333

• File Number: 8273.100
• Description: Colorado River Basin Salinity Control - Federal Agency Reports - BOR
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/1/1975
• Title: Application of Stochastic Hydrology to Simulate Streamflow and Salinity in the Colorado River
• Water Supply Pro - Doc Type: Report/Study

N
t-
oo

. 222 2
Here var~ances for the periods k and N are Syk' Sxk' Syn' and Sxn'

and rk i$ the correlation coefficient. As an example of this adjust-
ment, th~ standard deviation for January of the Colorado River near
Cameo for 1942-1956 (S k) was 200. Records for Cisco produced a
long term standard devlation of 613 (S n) and a 1942-1956 value of
337 (Sxk)' Correlation analysis for tEe 1942-1956 period indicated
the correlation coefficient was 0.95. The estimated long period
standard deviation was calculated as

..,;..

1/2
S = [2002 - 0,95 200 (3372-6132) ] = 434
yn 337

This adjQstment was performed when applicable to estimate the long
term monthly variance at several stations in the basin. The detailed
calculations are not reproduced in this report.

In addition to the procedure above, it was occasionally necessary to
further revise estimates of monthly standard deviations. This occurred
when there was a large discrepancy between the synthetic values and
those de4med reasonable for the common period. This effect may be attrib-
uted to there1ationship not being linear as had been assumed.

The ComPrehensive Framework Studies estimate of depletions and
availabl~ flows above the Lee Ferry Compact Point was adjusted for
evaporat~on losses at Fontenelle and Navajo Reservoirs and the
estimate4 average 23,000 acre-foot Paria River .flow. The obtained
adjusted ~a1ues for use in the model were as follows:

Area

1965 1 eve1
depletions

1914-1965 average
available flow

I
\

Green River subregion
Upper ~in Stem subregion
San J~n subregion
Upper ~oIorado Region
(a t Lees Ferry)

12,086,000

978,000 AF
1,397,000
387,000

4,482,000 AF
5,409,000
2,196,000

2,763,000

For the stochastic data base it was assumed that all the changes in
depletions to the 1965 level occurred above the key gaging stations:
Green River at Green River, Utah; Colorado River near Cisco, Utah;
and San J~an River at Bluff, Utah. With this assumption, the
followingiaverages were obtained:

21