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<br />. <br /> <br />. <br /> <br />. <br /> <br />.~. - <br /> <br />00lS71 <br /> <br />WATER SUPPLY <br /> <br />It was necessary in the appraisal of the water supply for the <br /> <br />San Juan Basin to assume project features as designed by the Bureau <br /> <br />of Reclamation. Required by-passes as assumed by the Bureau and <br /> <br />agreed to by Colorado and New Mexico had to be used and the sizes <br /> <br />of the diversion canals and collection conduits recommended in the <br /> <br />Supplemental Report of May, 1957 were also employed. <br /> <br />The average annual divertible flow available in the May, 1957 <br /> <br />report of the Bureau of Reclamation was 105,300 acre-feet based on <br /> <br />the period 1927 throu<]h 1955. The average annual supply available <br /> <br />for diversion from this study was 103,116 acre-feet based on the <br /> <br />period 1942 through 1957. There was a very close agreement between <br /> <br />the two studies in the total water supply for the same years. The <br /> <br />main differences were in the amounts of water spilled and the resultin<] <br /> <br />water available for diversion. The period selected for this analysis'" <br /> <br />was more critica.l than that chosen by the Bureau, but in coincident <br /> <br />years the amount spilled in their study was much larger, Spills in <br /> <br />this operation were determined by an examination of the. daily flows. <br /> <br />Spills were considered to be water at the diversion site in excess of <br /> <br />the diversion canal capacity plus the req1.1ired by-pass flows for down- <br /> <br />stream requirements. There were spills in 1952 and 1957 at the Navajo <br /> <br />River diversion dam site, but it would not be economical to change the <br /> <br />.. - 12 - <br /> <br /><< ~""'" <br />