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-7- delivered to Mexico at Morelos Dam, creating the salinity problem. In the Lower Colorado River region, water with 6,000 p.p.m. of dissolved solids is completely useless for all important crops of the region. For example, the irrigation of cotton or wheat would be impossible with water of that degree of salinity, for in each irrigation, even using a large amount of excess water required to leach the soil by infiltration, a continual increase of salts would accumulate in the soil and subsoil which would completely nullify the productivity thereof. For that reason the Wellton-Mohawk District expels such water outside that Valley. Furthermore, there is being carried out, in this manner, substitution in the underground aquifers of Wellton-Mohawk for the highly saline water contained therein extracted by the wells, by infiltration of usable irrigation waters from the Colorado River, coming from Imperial Dam, within a period of approximately 25 years, according to estimates of the U. S. B. R. b) Mixing of waters proposed by U. S. B. R. To use for irrigation the mixture proposed by the U. S. B. R. contaminated with Wellton-Mohawk wastes or others of similar nature which would result from Phase 3 of its program, would involve Mexicali's using a much greater additional quantity of water for leaching than the quantity of waste waters themselves and, accordingly, the proposed solution of the problem would be worse if such waste waters were included in Mexico's allocation than if said allocation were reduced by a similar quantity. Considering the quantity of waste waters from Wellton-Mohawk, which at present comprise only about 15% of the totalEpson Perfection 4870 Photo, 400 dpi, 24 bit, 11,647,488 byte