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<br />., . <br /> <br />. <br /> <br />. <br /> <br />DISCUSSION ON THE DETERMINATION THAT 500,000 ACRE-FEET <br />OF NAVAJO RESERVOIR STORAGE COULD BE MADE A V AILABLE <br />FOR THE ENDANGERED FISH WITHOUT INTERFERING WITH <br />NEW MEXICO'S COLORADO RIVER CONSUMPTIVE ENTITLEMENT <br /> <br />As a major part of a reasonable and prudent alternative suggested by the Southwestern <br />Water Conservation District and other sponsors of the ALP project, it was suggested <br />that 500,000 acre-feet (at) of Navajo reservoir storage (and its associated yield) be <br />provided for use in a recovery program for the endangered fish. The 500,000 af value <br />was derived by hydrologists working for the District as the amount of water in Navajo <br />not needed to serve future consumptive demands entitled to New Mexico water users <br />under the Rio Grande Compact. To obtain this number, a hydrologic model of major <br />water supplies and demands in the San Juan River Basin was prepared as described <br />below. <br /> <br />San Juan River Basin Water Supply/Water Demand Model <br /> <br />The model developed was based on U.S, Bureau of Reclamation modeling used for their <br />hydrologic assessment and for the U.S. Fish and Wildlife Service biological opinion. <br />The model includes a set of estimated un-depleted monthly flows for the San Juan <br />River system for 1929 through September,1974 and a set of depletions to superimpose <br />on those flows. The model allows the user to impose both estimated current depletions <br />and future depletions for New Mexico water users. The following current and future <br />demands are imposed in the modeling on the approximately 2,000,000 af of average <br />annual flow contained in the model. <br /> <br />Current Average Annual Modeled Demands in New Mexico <br /> Acre-feet <br /> Diversion Return Flow T>pl'*lm <br />San Juan Chama 104,000 104,000 <br />Navajo Reservoir Evaporation 28,000 <br />Navajo Indian Irrigation Proj ect 169,000 35,000 134,000 <br />Citizens Ditch 32,500 17 , 500 15,000 <br />Hammond Canal 23,000 13,000 10,000 <br />Industrial Depletion 3,000 3,000 <br />Fruitland Diversion 19,900 12,900 7,000 <br />San Juan Power Plant 16,000 16,000 <br />Jewitt Valley Canal 6,300 4,300 2,000 <br />M&I Depletion 5,000 5,000 <br />Utah International 55,000 55,000 <br />Hogback Canal 70,500 39,800 30,700 <br />Totals 504,200 122,500 409,700 <br /> <br />C\:> Leonard Rice Consulling Waler Engineers, Inc, <br />