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<br />'. <br /> <br />" <br />" <br /> <br />. <br /> <br />. <br /> <br />001138 <br /> <br />-6- <br /> <br />4. nexioan Treatv Commitment <br />A treaty with the United l1exioan States guarantees that the United <br />States will deliver'l,500,000 ~ore-feet annually to that oountry. In time <br />of extraordinary drought this amount, under the terms of the treaty, may <br />be reduoed in ~he same degree that oonsumptive uses are ~eduoed in the <br />United States. The treaty was ratified by the United States Senat~ on <br />April 18, 1945. <br />At hearings before the Senate Committee on Foreign Relatiqns, several <br />engineering experts testified that the return flow at the International <br />Boundary ~uld amount to 900,000 aore-feet or more. One, an anti-treaty <br />witness, set the figure at 150,000 to 250,000 acre-feet. In the House of <br />Representative hearings on the Central Arizona Project, H.R. 934 and <br />H.R. 935, witnesses for Arizona set the amount of return flow at 900,000 <br />acre-feet and the burden on the river, the amount of new water to be <br />furnished to satisfy the Treaty demand, as 600,000 acre-feet. Colorado, <br />as has been noted, is allotted, under the Upper Colorado River Compact, <br />51.75 percent of the (7,500,000 - 50,000') acre-feet allotted to the <br />Upper Basin at Lee Ferry. Assuming a l.iability in a proportionate amount, <br />Colorado's share of the 600,000 acre-feet to be furnished would be l56,00~ <br />The figure given on p. 7 as Colorado's share of the l:exican Treaty <br />Supply is obtained by assuming that it will be necessary for the Upper <br />and Lower Basins to furnish 750,000 acre-feet of water in addition to a <br />return flow of 750,000 acre~feet. Half of the 750,000 acre-feet must be <br />furnished by the Upper Basin and Colorado's share would be 51.75 percent <br />of 375,000 or 194,000 acre-feet. <br />