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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4. The plant will be located west of Yuma, Arizona.

5. The plant will have a 90 percent plant factor.

6. The product water recovery of the desalting plant will be
70 percent.

7. The bypass drain will have a capacity of 353 cfs.

If any of the assumptions change, the design of the plant and the
cost will change in order to maintain the average annual salinity
differential of 115 ppm ~ 30 ppm TDS.

The desalting plant will occupy a 44-acre site about 4 miles west
of Yuma, Arizona, and 2 miles upstream from Morelos Dam. While having
a maximum capacity of 100 million gallons a day, it will operate at a
90 percent plant factor, producing 90 million gallons of treated water
daily. The remaining 10 mgd capacity will permit maintenance without
interruption of normal production.

The plant will be designed to accept Wellton-Mohawk drainage flows,
conveyed to the plant site in the existing Main Outlet Drain Extension.
Product water containing total dissolved solids of about 240 ppm will
be returned by pipeline to the Colorado River above Marelos Dam via the
Main Outlet Drain Elctension No.2. The product water will be blended
vith the remaining untreated Wellton-Mohawk drainage in M.O.D.E. No.2
to produce water with the same salinity as that arriving at Imperial Dam.
A fiow chart for the desalting plant is shown on Plate 2.

The reject stream from the desalting plant will be returned to the
Main Outlet Drain Elctension. To prevent this reject stream from entering
the Colorado River and degrading ground water in the United States and
Mexico, the present bypass drain which terminates below Moreloa Dam will
be extended to Santa Clara Slough upstream from the Gulf of California.
This bypass drain extension will be approximately 53 miles in length,
of which 17 miles will be in United States territory and 36 miles in
Mexican territory. Funds will be transferred to the United Mexican
States for construction, operation and maintenance of that portion of
the drain in Mexico. The bypass drain extension will be designed and
constructed to the same capacity of the existing Main Outlet Drain
Extension so that all of the Wellton-Mohawk drainage can be discharged
to Santa Clara Slough during periods of emergency. The full capacity also
vill be needed before the desalting plant goes into operation. About 330
acres of right-of-way vill be required for construction of the bypass
drain in the United States. In Mexico, the right-of-way will consist of
about 550 acres of privately-held land and 200 acres of Government-
owned land.

The Main Outlet Drain Extension section of the Wellton-Mohawk
drainage conveyance facilities contains a 2,600-foot metal flume located

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