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C) r::> J.- ~ -.l co -8- later than July 1, 1974, subject to the authorizat..Lon by the CongresS of funds for the necessary works, the approximately 1,360,000 acre-feet of Colorado River waters delivered to Mexico above its Morelos Diversion Dam "xmld have an annual average salinity of no more than 115:1:. 30 parts per million (ppm) over the annual average salinity of Colorado River waters arriving at Imperial Dam, i.e., thOSe delivered to the lowermost major downstream users in the United States. ThiB means that while Mexico will accept delivery of waters somewhat more saline than those used in the United States, the United States must as a minimum remove from those waters the adverse effect of the highly saline drain waterS pumped and discharged to the river by the Wellton-l1ohawk Irrigation and Drainage District of Arizona. It is proposed to attain this average annual differential by a combination of improvements to reduce drain flows from the Well ton-Mohawk Project and by construction of a desalting plant. When completed, the desalting plant would treat a major portion of the Wellton-Mohawk drain water, so that, in combination with the untreated Well ton-Mohawk drain water, it may be delivered to Mexico "ithin the agreed differential. During an interim period, while desalting facilities are being constructed, the United states will bypass all the Wellton-Mohawk drain water without charge to Mexico against its guaranteed treaty allotment, and will substitute higher quality water that "ill be delivered to Mexico in p.lace of it. This better water will .at first be borrowed from storage reservoirs and, later, be made up in large .. . 10.,'"