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<br />q ',i ''1 Q I)' U <br />l, ~.:I tv '-'.:... ..) <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />per year since they were constructed in about 1958. <br /> <br />During the study period, transbasin diversion from Wolf Creek to the <br /> <br /> <br />Rio Grande basin through Treasure Fass Ditch have averaged 234 acre-feet <br /> <br /> <br />per year. Transbasin diversions from Fourmile Creek to the Fiedra River basin <br /> <br /> <br />through the Dutton Ditch have averaged about 750 acre-feet per year. Transbasin <br /> <br /> <br />diversions from the Rio Blanco to the Rio Grande basin through the Blanco <br /> <br /> <br />diversion of the San Juan-Chama Project have averaged 42,300 acre-feet per <br /> <br /> <br />year from the beginning of project operations in 1911 through 1980. The average <br /> <br /> <br />diversion over the 1951 through 1980 study period was 14,100 acre-feet per <br /> <br /> <br />year. <br /> <br />Total stream depletions in the San Juan River basin upstream from the <br /> <br /> <br />confluence with the Navajo River have averaged about 31,200 acre-feet per <br /> <br /> <br />year during the 30 year study period. A monthly summary of the estimated <br /> <br /> <br />stream depletion, including irrigation depletion, reservoir evaporation, and <br /> <br /> <br />transbasin diversions, is presented in Appendix E. <br /> <br />Depletions Study for the Navajo River <br /> <br /> <br />The inigated land in the Navajo River basin totals about 3,830 acres, <br /> <br />of which 390 acres are on the Navajo River or its tributaries within New Mexico. <br /> <br /> <br />The predominant crops are meadow grass with some irrigated pasture. Approxi- <br /> <br /> <br />mately 1,260 inigated acres are below 7000 feet in elevation, and the remainder <br /> <br /> <br />(2,570 acres) are above 7000 feet in elevation. The annual diversion required <br /> <br /> <br />to meet the full consumptive use requirement would be approximately 5,600 <br /> <br /> <br />acre-feet for inigated areas below the 7000 foot elevation and approximately <br /> <br /> <br />8,800 acre-feet above the 7000 foot elevation, based on a 50 percent inigation <br /> <br /> <br />efficiency. Total annual diversions required to meet the full crop consumptive <br /> <br /> <br />use requirement are 14,400 acre-feet. <br /> <br />The Water Commissioner for Water Districts 29 and 77 has indicated <br /> <br /> <br />that generally there is a good supply of water, especially along the larger river <br /> <br /> <br />segments and at higher elevations. Occasionally, some late season shortages <br /> <br />-23- <br /> <br />,L~ <br />