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'l.'here is no water quality requireMent in the l1exican 1'1ater . 'l'reaty. However, in 1961 the Government of Hexico protested that the water being delivered to Hexico under the 1944 Water Treaty was -.:! so saline as to be unacceptable under that treaty and contaminated contrary to international law. The cause of the sudden increase in salinity was the initiation of a well drainage system to the Wellton-Hohawk Irrigation and Drainage District of Arizona. ~~ile the United States did not admit to a violation of the Treaty or international law, it sought at once to reduce the salinity of the water used by Mexico, and urged that the two governments seek a practical (as distinguished from juridical) solution that would Imeet the needs of I In 1965, the r both countries. International Boundary and Water Commission, with ~ ;the assistance of intensive studies made by both Governments, suc- I ceed~d in concluding an agreement designed to provide a possible means of a practical solution. Since the agreement, Minute No. 218, was limited to five years and both Governments reserved their /\/'~ C' '. legal rights, its concept ~i~h~alleviation of the immediate diffi- culty in which the two countries found themselves, and experj~en- tation over the term of the agreement with measures that migh1!. eventually remove the problem altogether. Under the 1965 agreement the United States constructed an --, extension of the Wellton-Hohawk drainage channel to "permit discharge" of Hellton-Hohawk drainage either above or belm1 Hexico' s di,version The w., -I, ~ point, as }lexico might request. Th~~ ~~G di~~~arged below would be wasted to the Gulf of California. Hith the extension channel in , operation, the United States was to pump selectively the Hellton- Nohawk drainage wells, the salinity of which ,varies widely, in 10 " . . . . . . ':0. _ _, -"'''...... ~