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1 2,0 BACKGROUND <br />The United States - Mexico Treaty of 1944 allocates to the Republic of Mexico a guaranteed <br />annual quantity of 1,500,000 acre feet (1,850 x 106 M3) "of the waters of the Colorado River." <br />The allocation of the State of Nevada under the Colorado River Compact of 1922 is 300,000 ac- <br />ft (370 x 106 M3) per year. <br />The issue of water quality was not addressed directly in the Treaty of 1944; but became a <br />practical issue in 1961 when the salinity of the Colorado River water delivered to Mexico <br />became so salty that significant crop losses were beginning to occur in the Mexicali Valley <br />farming area. In November 1961, Mexico formally protested that the quality of the water <br />delivered at the International Boundary was unacceptable. As a result of Mexico's protest, a <br />series of interim measures were taken by the United States North of the International <br />Boundary to control the salinity of the water delivered to Mexico. <br />Finally, in order to impose a permanent solution, in August, 1973, recommendations by the <br />special representatives of the two governments were approved by their respective presidents, <br />ratified by the two governments, and incorporated into Minute No. 242 of the International <br />Boundary and Water Commission. <br />Minute No. 242, in effect to date. provides that "the Treaty water annually delivered to Mexico <br />upstream of Morelos Dam have an annual average salinity of no more than 115 ± 30 ppm over <br />ithe annual average salinity of Colorado River water arriving at Imperial Dam." <br />r <br />E <br />9 2 Carollo Black & Veatch <br />