WSP08031

• File Number: 8278.100
• Description: Title 1 - Yuma Desalter
• Basin: Colorado Mainstem
• Date: 4/1/1977
• Author: USDOI/BOR
• Title: Colorado River Basin Salinity Control Project - Title I Division - Desalting Complex Unit, Arizona - Status Report
• Water Supply Pro - Doc Type: Publication

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S fAT 1ST I C A L SUM MAR Y

Colorado River Basin Salinity Control Project
Title I Division, Desalting Complex Unit, Arizona

LOCATION:

The project area is located in valleys adjacent to the
Gila and Colorado Rivers in southwestern Yuma County,
Arizona, and northwestern Sonora, Mexico.

AUTHORIZATION:

The project was authorized for construction by Act of
June 24, 1974, (88 Stat. 266), Public Law 93-320, Title I -
Pr09rams Downstream from Imperi a 1 Dam (spec ifi ca lly
Section 101).

EXISTING DEVELQ~MENT:

.

The project will reduce the quantity of irrigation drainage
pumped from the shallow aquifer beneath fields of the
Wellton-Mohawk Division of the Gila Project, and improve
its quality so that it can be utilized as part of the
deliveries to Mexico in accordance with the Treaty of
February 3, 1944 (Treaty Series 994). Pumped drainage from
the 65,ODO developed acres is currently transported to the
Colorado River channel on the downstream side of Mexico's
Morelos Dam via the continuous Well ton-Mohawk Main
Conveyance Channel (WMMCC) and Main OUtlet Drain Extension
(MODE), without credit toward Treaty deliveries, in order
to comply with obligations of the Aqreement "lith ~1exico of
August 30, 1973 (Minute No. 242 of the International
Bouldary and Water Commission). The primary objective of
the Minute is to limit the average annual salinity of the
approximately 1,360,000 acre-feet of water delivered to
Mexico upstream of Morelos Dam to no more than 115 parts
per million (p/m) + 30 plm over the annual average salinity
of Colorado River waters which arrive at Imperial Darn; these
waters presently average 823 p/m.

PLAN:

In executing the plan to reduce the quantity and improve
the quality of Well ton-Mohawk Division drainage so that
the majority of it can be credited toward Treaty deliv-
eries, seven measures will be implemented:

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1.

Construction of the 108.5 million gallons per day
(Mgal/d) equivalent product capacity membrane Yuma
Desalting Plant to treat drainage water from the
Division;

a