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. . e..,) 00 ..... 00 . . . I. . . . . REFERENCES 1 For example, Problems of the Imperial Valley and Vicinity (the Fall-Davis Report), 1922; the Boulder Canyon Project Act, 1930; and the Colo.rado River (the Krug Report), 1946. 2 Some of the problems were (are): the clogging up of canals and irrigation works; reduced storage capacity of dams and reservoirs; reduced crop yields; and the costs of silt removal projects. 3Such is the view expressed in Hundley's Dividing the Waters: A Century of Controversy Between the United States and Mexico. 4rn an address to the California Water Resources Association in 1972, Myron Holburt sums up these understandings as follows: The Treaty which became effective on November 8, 1945, after ratification by the two Governments, does not specifically refer to water quality. However, State Department representatives and their consultants testifying before the United States Senate in support of the Treaty stated that water quality was extensively discussed, and that Mexico fully understood that provisions that were included in the Treaty to insure that Mexico must accept return flow and drainage water are in Articles 10 and 11. Art ide 10 states that Mexico's allotment includes water from "any and all sources, " and Article 11 states that "waters shall be made up of the waters of the said river whatever their origin. " 5Minute 241, which superseded Minute 218, had been concluded in July, 1972, and provided a temporary solution to the Mexican pro- blem. Under this Minute, the United States agreed to divert 118,000 acre feet of Welton-Mohawk irrigation return flows to the Colorado River below Morelos Dam, and to replace these diverted waters with an equal quantity of other higher quality waters to fulfill the Treaty obligation to deliver l.5 maf/yr. 27 ::t, -.