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<br />, .. <br /> <br />002010 <br /> <br />However, without regulation serious shortages could result <br />in late season diversion requirements. The 1955 report on the Navajo <br />Project contains estimates of return flows from the proposed new uses <br />which indicate that the returns would occur in sufficient amounts and <br />at times which would permit supplying the ideal diversion schedules <br />of the four ditches. <br />The location, quantity and monthly distribution of these <br />possible return flows are presently indeterminate to some degree in all, <br /> <br />, ~ <br /> <br />cases. Data relative to those return flows which may result from diver.. ' <br /> <br /> <br />sions to the proposed Navajo Indian Project are the most highly con- <br /> <br /> <br />jectural. <br /> <br />A study was made by the committee based on estimates of <br />amounts and monthly distribution of return flows contained in the let- <br />ters of the New Mexico State Engineer and the Navajo Project report. <br />The study disclosed that, even if these return flow estimates are <br />reasonably accurate for uses other than the Navajo Project, material <br />shortages would result if the expected return flows from that proj- <br />ect fail to materialize. These shortages in the ideal monthly diver- <br />sion requirements of the four ditches would occur in all except a few <br />years of the study period having exceptionally high late season run- <br />off. They would average about 11 percent and could be as much as 20 <br />to 30 percent in the drier years of the period. <br />It is recognized that some return flow water will be avail- <br />able at the headgates of the four ditches on the San Juan below the <br />mouth of the Animas. The committee feels, however, that some by-pass <br />of water at the Navajo Dam will be required for these prior rights. <br /> <br />-19- <br /> <br />':..i <br />