WSPC02026

• File Number: 8200.700
• Description: Colorado River Basin General Publications - Augmentation-Weather Modification
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/2/1983
• Title: Preliminary Evaluation of the Ongoing Salinity Control and Related Programs in the Colorado River Basin
• Water Supply Pro - Doc Type: Report/Study

000009

Item

Upper bas i n
scenario
(change from base)
(l,OOO's acre-feet)

Lower bas i n
scenari 0
(change from base)
(l,OOO's acre-feet)

Upper basin shortages
Upper basin depletions
Glen Canyon releases
Upper basin storage
Lower bas in stor age
Total evaporation
CAP del ivery
MWD del ivery
Mexican delivery

Salinity at Imperial mg/L

-22
88
1,200
43
25
138
491
186
427

-110 r.lg/ L

-22
88
1,295
3
26
112
614
146
415

-114 mg/L

Under the Upper Basin scenario, 1,104,000 acre-feet are distributed as
additional annual flows to MWD (Metropolitan Water District), California,
CAP (Central Arizona Project), and to the Republic of Mexico, while under the
Lower Basin scenario 1,175,000 acre-feet of additional water is available
for these three entities, out of a total of 1,430,000 acre-feet of enhanced
flow. Only 8 to 11 percent of the enhanced flow 90es to increased Upper
Basin use or storage.

The accompanying salt pickup associ ated with the enhanced water supply amounted
to 212,000 tons per year or, about a 4 percent increase in salt load, with a
10 percent increase in water. It, therefore, appears that as a salinity
control alternative, the basin-wide operational program could produce approxi-
mately a net 90 to 100 mg/L reduction at Imperial Dam by 1995, if CREST
be9ins in 1986 and the operational program begins in 1991.

The study predicts what the impact of an additional 1.43 million acre-feet
would be with the present concept of basin development. Predictions using
other aU9mentation potentials would result in proportionately different
salinity reductions.

The important assumptions for this study include:

1. The CREST demonstration program could produce 340,000 acre-feet per
year, on the average.

2. The basin-wide operational program could produce 1,430,000 acre-feet
per year, on the average.

3. The cloud seeding program produces water with an average concentration
of 100 m9/L. Thus, the demonstration phase would produce 48,000 tons of
salt annually, and the operational prcgram would produce 212,000 tons
annua 11 y.

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