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�. o7z2 <br />HYDROLOGIC EFFECTS OF REDUCING IRRIGATION TO MAINTAIN <br />A PERMANENT POOL IN JOHN MARTIN RESERVOIR, <br />ARKANSAS RIVER VALLEY, COLORADO <br />By Richard R. Luckey <br />ABSTRACT <br />The U.S. Geological Survey has evaluated a plan by the Colorado <br />Division of Wildlife to maintain a permanent pool of 10,000 acre -feet <br />7 <br />(1.2x10 cubic meters) in John Martin Reservoir on the Arkansas River. <br />This pool would be maintained through the use of water assigned to shares <br />in the Catlin Canal Company that the Division has acquired. This plan <br />was evaluated using a lumped parameter model developed to test <br />management alternatives in a stream - aquifer system. A 25 -year period <br />from 1949 through 1973 was simulated. Based on this simulation, it is <br />concluded that (1) the Division of Wildlife has sufficient shares in <br />the Catlin Canal Company to maintain a permanent pool of the proposed <br />size, (2) surface -water diversions by most other canals in the basin <br />would increase slightly under the proposed plan, (3) the flow at the <br />Colorado - Kansas State line would increase slightly under the proposed <br />plan, and (4) the ground -water system would not be significantly <br />affected by the proposed plan. <br />4 <br />