WSP09883

• File Number: 8273.100
• Description: Colorado River Basin Salinity Control - Federal Agency Reports - BOR
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 9/1/1973
• Title: Colorado River International Salinity Control Project - Special Report - Executive Summary
• Water Supply Pro - Doc Type: Report/Study

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The Wellton-Mohawk Irrigation and Drainage District is affected by
those proposals involving improved irrigation and project water use
efficiencies, and reduction of total irrigable acreage. The implementa-
tion of these proposals will re~uire amendments to existing contractual
arrangements between the United States and the District.

Proposals associated with the lining of a 49-mile reach of the
Coachella Canal and its operation and maintenance will re~uire (1) the
negotiation of a repayment contract by the United States with the
Coachella Valley County Water District for costs associated with the
canal lining and (2) the modification of existing contracts between the
United States and the Coachella Valley County Water District and the
Dnperial Irrigation District.

It is anticipated that contract modifications will transfer
operation and maintenance responsibility for the 49-mile reach of
Coachella Canal from the Imperial Irrigation District to the Coachella
Valley County Water District.

VIII. CONSTRUCTION SCHEDULE

A control schedule has been prepared to cover the major components
of this Project, and is attached as part of this Executive Summary. The
components and their proposed construction schedules are as follows:

Item

Start

Completion

Main Outlet Drain Extension Siphon
Coachella Canal Lining
Bypass Drain, U.S. Portion
Bypass Drain, Mexico Portion
Desalting Plant

June 1974
May 1975
June 1975
June 1975
September 1975

July 1975
April 1977
June 1916
December 1976
December 1978

IX. COST SUMMARY

Because the purpose of this Project is to fulfill obligations
contained in the international agreement between the United states and
Mexico, the costs are presented as nonreilllbursable Il8.tional obligations.

Economic, social, and political considerations center on enhancing
interll8.tional comity with the United Mexican States. Since it is
impracticable to assess the full beneficial impact of improved ~uality
of water, and since the social and political considerations are outside
the realm of normal economic efficiency analysis, no attempt is made
to ~uantify benefits in monetary terms.

The total installation or construction cost of the Desalting
Complex is estimated at $98,050,000. The installation cost of
desalting plant facilities within the plant boundary is $62,080,000.
This includes:

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