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<br />" <br /> <br />4 <br /> <br />o <br />::) <br />~ The Treaty which became effective on November 8, 1945 after <br />--J <br />00 ratification by the two Governments, does noc specifically refer <br />r.o <br />to water quality. However, State Department representatives and <br /> <br />their consultants testifying before the United States Senate in <br /> <br />support of the Treaty stated that water quality was extensively <br />discussed, and that Mexico fully understood that the Treaty <br />required them to take return flows. The specific provisions that <br />were included in the Treaty to insure that Mexico must accept <br />return flow and drainage water are in Articles 10 and 11. Article <br />10 states that Mexico's allotment includes water from "any and <br />all sources," and Article 11 states that "waters shall be made up <br />of the waters of the said river whatever their origin." <br /> <br />Well ton-Mohawk Drainage Problem <br /> <br />Between 1945 and 1961, there were no particular problems with <br /> <br /> <br />respect to quality, as the salinity of the water delivered to Mexico <br /> <br /> <br />at the northerly international boundary was generally within 100 <br /> <br /> <br />parts per million of the water at Imperial Dam, the last diversion <br /> <br /> <br />point for users in the United States. However, in 1961, the Wellton- <br /> <br />Mohawk Project in Arizona commenced operation of its drainage system <br />and discharged its drainage water into the Colorado. Initially, the <br />drainage water included a substantial proportion of highly saline <br />groundwater that had been concentrated through reuse during the <br />previous half-century. This groundwater averaged around 6,000 parts <br />per million. There was a sharp increase in the salinity of the <br />water delivered to Mexico which resulted in strenuous objections <br />being raised by Mexico. <br /> <br />i <br />