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<br />2. The United States agreed to extend the concrete-lined
<br />Wellton-!,~oha'....k bypass drain from its present terminus
<br />at Morelos Dam to the Arizona-Sonora international
<br />boundary. In addition, it was agreed that Mexico,
<br />at the expense of the United states, would construct,
<br />operate, and maintain an extension of the concrete-
<br />lined bypass drain from the Arizona-So~ora international
<br />boundary to the Santa Clara Slough in Mexico, north of
<br />the Gulf of California.
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<br />3. Pending the conclusion of a comprehensive agreement on
<br />ground water in the border areas, each country agreed
<br />to limit pumping of ground waters in its territory
<br />within 5 miles of the Arizona-Sonora boundary near
<br />San Luis to 160,000 acre-feet annually.
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<br />To enable the United States to com;pJ,y with its obligations under
<br />Minute 242, Congress enacted and the President signed Public Law 93-320, the
<br />Colorado River Basin Salinity Control Act. The Act also provides for measures
<br />to control the salinity of the Colorado River upstream from Imperial Dam~
<br />Our discussion today will be confined to Title I of the Act which deals with
<br />programs downstream from Imperial Dam specifically designed to enable the
<br />United States to compJ,y with the obligations of Minute 242.
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<br />Title I authorizes the Secretary of the Interior to (1) construct,
<br />operate, and maintain a desalting complex to reduce the salinity of drain water,
<br />from the Wellton-Mohawk division of the Gila Project, Arizona; (2) construct
<br />a new concrete-lined canal or line 49 miles of the presentJ,y unlined Coachella
<br />Canal; and (3) construct, operate, and maintain, comfistentwith Minute 242,
<br />well fields capable of furniShing 160,000 acre-feet of water per year for use
<br />in the United States and for delivery to Mexico in satisfaction of the 1944
<br />Mexican Water Treaty.
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<br />There are. two ways in which the United states can maintain the l15-ppm
<br />differential between Imperial Dam and Morelos Dam specified by Minute 242:
<br />bypass around Morelos Dam all of the waters from the Wellton-Mohawk drain
<br />or treat the Wellton-Mohawk drain waters being delivered to the Colorado River'
<br />so that they have the same salinity as the waters of the Colorado River at
<br />Imperial Dam. The latter course is the one provided for by P.L. 93-320,
<br />the Colorado River Basin Salinity Control Act. It takes time, however, to
<br />design, construct, and begin to operate the facilities necessary to treat
<br />the Wellton-Mohawk drain waters. Until such time as the facilities are
<br />operating, the United States is obliged to bypass around Morelos Dam,
<br />without charge to Mexico, all of the Wellton-Mohawk drain waters. Bypass
<br />of these waters began on June 25, 1974.
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