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<br />37 <br /> <br />not be supplied by nature. A basic decision must be made as to the risk to take; <br /> <br />figures 5 and 6 will aid in making this decision. When the amount of annual supp~ <br /> <br />is decided upon, various combinations of acres, acre-feet per acre per year, and <br /> <br />priorities may be studied. The most promising solutions should be ana~zed on a <br /> <br />monthl;y" basis, to get a more accurate picture than is given by annual data. <br /> <br />Ana~ses in great detail probab~ are not justified, as any estimate of the <br /> <br />future water supply based on past records and studies is subject to considerable <br /> <br />error. Developments in both the U. S. and Mexico have so changed the stream-flow <br /> <br />pattern that a definite and reliable estimate is not possible. There is one <br /> <br />certainty, and that is: the historical stream-flow record does not give a true <br /> <br />picture of today's water supp~, and the "good" record (that since 1954) embraces <br /> <br />a major drought that makes it poor for a basis of estimating the future. <br /> <br />Even though hydrologic data are poor, what is available must be used. This <br /> <br />paper attempts to put the records in a form to be helpful. <br /> <br />-, ", r, r.. ~. <br />V~,~...LV <br />