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. . N c..u CJ) U1 tolerance to salty waters. Rather than employ a cropping pattern which utilizes salt tolerant crops, they insist on raising the crops, which in their opinion, will provide the highest market value. Actually, were they to recognize the cropping pattern which must be followed by United states irrigators, they would find, as we have found, that crops with higher salt tolerance would produce more abundant yields and more cash return than the crops which they are attempting to grow now. l' Mexicans do a considerable amount of irrigation by means of pumping. The quality of water which they receive from their pumps was reported by Mr. West to have a total dissolved solids in the range of 1700 to l800 parts per million. Residents in the lower Colorado River valley in the vicinity of Yuma, state that this is an extremely conservative estimate and that the results of some of the tests Which they have observed indicate that this dissolved solid contents will run more nearly in the range of 2400 to 2500 parts per million. In accepting either estimate we find that Mexi- cans, by their own choice, are irrigating crops with pumped water of a quality much poorer than that which they demand from the colorado River. Such inconsistencies surely cannot be tolerated by the United States. It has been suspected for some time that the pUmp- ing accomplished by the Mexicans is simply a means of depleting the Colorado River flows in a manner such that a part of the Colo- rado River water available to Mexico is not measured and therefore not governed by Treaty. The water which they pump is, in general, from an unconfined aquifer which must be recharged by Colorado River waters. There is no question in the mind of anyone locally familiar with this problem but what the Mexican demands for releases of water in excess of the Treaty amounts will continue and that the amounts in excess of Treaty requirements will grow. Item #3 of this Bulletin is a report from a Mexican engi- neer, Adolpho Orive Alba, Executive Chairman of the National Irri- gation commission of Mexico, which was made before the Senate of the Republic of Mexico at their hearings on the Treaty. This was introduced into the Congressional Record as Senate Document 98, 79th Congres$, 1st Session, and is taken from "Translation of an Article from the El Universal, Mexico City, Newspaper, AUgust 1, 1945". It is significant to note here that the Mexican irri.gators have historically depended on works constructed by United States capital for their irrigation. The Alamo Canal, built by United States citizens in the Imperial valley, for irrigation of the Im- perial valley in the United States, originally passed through Mexico enroute to the Imperial Valley. The price for the right-of-way Information Bulletin #18 -8- January 12, 1962 ; ,:. ,> , -1~ ::., r>