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0741 SUMMARY <br />The Colorado Department of Natural Resources, Division of Wildlife, <br />has acquired 11.24 percent of the shares in Catlin Canal in order to <br />maintain a permanent pool of about 10,000 acre -feet (1.2x10 m of water <br />in John Martin Reservoir. The U.S. Geological Survey was asked to evaluate <br />the effects of this plan on the hydrologic system in the Arkansas River <br />valley. A model developed for testing management alternatives was used <br />to evaluate this change in water use plan. <br />The 25 -year period from 1949 through 1973 was simulated. In <br />simulating the change in water use, the following assumptions were made: <br />1. Only the consumptive use (77 percent) of the Division's water <br />would be transferred to the reservoir. The recharge (23 percent) would <br />be returned to the river. <br />• ! 2. The Division would be charged a river loss of 0.07 percent per <br />mile (total loss 2.5 percent) for transporting the water down the river <br />to the reservoir. <br />3. Evaporation from the reservoir would be proportioned between the <br />permanent pool and the nonpermanent pool on the basis of their respective <br />volumes. <br />4. Irrigators under the Catlin Canal would not be allowed to pump <br />water to make up for the 11.24 percent of the shares that were sold to the <br />Division of Wildlife. <br />5. The Division of Wildlife did not claim any of the imported water <br />that belonged to the Catlin Canal. <br />6. The pool size was limited to 15,000 acre -feet (1.9x10 m provided <br />. that the flood- control pool was not invaded by more than 10,000 acre -feet <br />(1.2x10 m <br />23 <br />