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<br />4"J.';-' ~< r~ 7 '1 <br />u ~~; () ,J "'_ <br /> <br />. <br /> <br />. <br /> <br />all the irrigated area is below 7000 feet in elevation. The annual diversion <br /> <br /> <br />required to meet the full consumptive use requirement is approximately 950 <br /> <br /> <br />acre-feet, based on a crop consumptive use requirement of Z.Z acre-feet per <br /> <br /> <br />acre and a maximum irrigation efficiency of 50 percent. The Water Commissioner <br /> <br />for Water Districts 29 and 77 has indicated that there is a good itTigation water <br /> <br /> <br />supply along the main stem of the San Juan River. The average river depletion <br /> <br /> <br />for this segment of the San Juan River is about 480 acre-feet per year. Because <br /> <br /> <br />most of the irrigated land within the basin is located adjacent to the San Juan <br /> <br /> <br />River or its tributaries, it was estimated that monthly irrigation depletions <br /> <br /> <br />are approximately equal to the monthly potential consumptive use of irrigation <br /> <br />water. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Total stream depletions in the San 'Juan River basin downstream from <br /> <br /> <br />the Confluence with the Navajo River and upstream from Navajo Reservoir <br /> <br /> <br />have averaged about 500 acre-feet per year. A monthly summary of the esti- <br /> <br /> <br />mated river depletion is presented in Appendix E. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />-25- <br /> <br />. <br /> <br />,~ d <br />