WSP09828

• File Number: 8276.852
• Description: Moapa Valley Subevaluation Unit - Colorado River Salinity Control Project
• State: NV
• Basin: Colorado Mainstem
• Date: 6/1/1980
• Title: USDA Salinity Control and Environmental Assessment
• Water Supply Pro - Doc Type: EIS

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1 Erosion control improvements are estimated to have a total installation
2 cost of $161,200 or an annual cost of $14,000. Operation and maintenance cost
3 is estimated to be $3,000 ahnually.
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Installation for Alternative 2 including $464,100 for technical assistance
totals $7,873,500 or $683,300 annual cost. Total program cost with operation,
maintenance and replacement, and fo110wup technical assistance added in is
$792,500 annually.

Downstream and onfarm annual benefits increase during installation and total
$1,428,000 following installation. Downstream annual benefits are $876,000 based
on a reduction of 2.0 milligrams per liter in sait concentration in the Colorado
River at Imperial Dam near Yuma, Arizona. Water used for 'irrigation would be
reduced 5,000 acre-feet. An estimated 86 percent of this water would be applied
to other uses and has a value of $198,000 for other uses based on the value of
water used for agriculture in the valley. Annual onfarm benefits accruing from
implementing Alternative 2 are $354,000. This includes annual labor savings of
$72,000. Total program benefits are $2,106,000 annually ($1,428,000 for a 25 year
period and $678,000 during the installation period). The ratio of benefits to
costs is 2.7 to 1.0.

Implementation of Alternative 2 could require a 75 percent or greater federal
cost-share assistance to assure farmer participation. Land users would furnish

the remaining 25 percent or less, plus annual operation, maintenance, and replace-
ment costs. See Table 1. High local indebtedness may require substantial cost-

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