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072 <br />� .0 <br />INTRODUCTION <br />The Colorado Department of Natural Resources, Division of Wildlife, <br />acquired 11.24 percent of the shares in the Catlin Canal Company in 1972. <br />This company operates a canal to divert water for irrigation from the <br />Arkansas River below Pueblo, Colo. In 1974, the Division of Wildlife <br />petitioned the District Court to change the water rights in order to use <br />the water available to these shares to maintain a permanent pool of about <br />10;000 acre -feet (1.2x10 m in John Martin Reservoir for recreation <br />purposes. <br />The U.S. Geological Survey was asked by the Division of Wildlife, <br />through the Colorado Water Conservation Board, to evaluate the hydrologic <br />effects of the proposed change in water use on the lower Arkansas River <br />valley in Colorado. The Geological Survey had already developed a model <br />of the system for testing management alternatives (Taylor and Luckey, <br />1974). This model, which accounts for all of the major components of the <br />hydrologic system using a digital computer, was used to evaluated the <br />proposed change in use of water. <br />G� <br />