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<br />- ---~-_. -~- - <br /> <br />OG22~6 <br /> <br />Salinity oj the Lower Colorado River/39 <br /> <br />The agreement in Minute No. 242 provided that: <br />. By July 1, 1974. subJeet to congressional authoriza- <br />tion of the necessary works. the salinity of Mexieo's <br />guaranteed allotment of Colorado River water deliv- <br />ered at Morelos Dam (Mexico's prinCipal point of di- <br />version) must not exceed the salinity of the Colorado <br />River at Imperial Dam plus a ditTerentlal of 115 ppm (:t <br />30 ppm U.S. count). calculated on an annual average <br />basis. The differential reflects the increased salinity <br />due to irrigation drainage waters other than those <br />from the Wellton-Mohawk District which return to <br />the Colorado River between Imperial Dam and More- <br />los Dam. <br />. The life of Minute No. 241 was terminated and. until <br />Congress authorizes the necessary works. "the United <br />States shall discharge to the Colorado River down- <br />stream from Morelos Dam volumes of drainage waters <br />from the Wellton-Mohawk District at the annual rate <br />of 118,000 acre-feet. . . and substitute therefor an <br />equal volume of other waters to be discharged to the <br />Colorado River above Morelos Dam: and, pursuant to <br />[Mexico'S requestl, the United States shall discharge to <br />the River downstream from Morelos Dam [the <br />. remaining volume of the Wellton-Mohawk District <br />drainage waters], with the understanding that this <br />remaining volume will not be replaced by substitution <br />waters." This interim operation was essentially the <br />same as provided by Minute No. 241. <br />. The United States would build an extension to the <br />lined bypass drain to carry Wellton-Mohawk drainage <br />in the United States from More10s Dam to the Ari- <br />zona-Sonora boundary and pay for an extension to be <br />built from the Arizona-Sonora boundary through <br />Mexico to the Santa Clara slough on the Gulf of Mex- <br />ico. <br />. Each country agreed to limit groundwater pumping <br />within five miles on each side of the ArIzona-Sonora <br />boundary to 160.000 acre-feet annually. This limited <br />Mexico's pumping and enabled the United States to <br />offset Mexican pumping. <br />. 'With the objective of avoiding future problems. the <br />United States and Mexico shall consult with eaeh <br />other prior to undertaking artY-new development of ei- <br />ther the surface or the groundwater resources . . . in Its <br />own territory in the.~Rorder area that might adversely <br />affect the other courtqy." <br />,"'~ <br /> <br />" <br />" <br />-'.~ <br />