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i <br />0740 <br />t <br />Under the change in water use plan, evaporation from the total pool <br />in John Martin Reservoir during the last year of simulation is 7,600 <br />acre -feet (9.4x10 m This evaporation is proportional between the <br />.■WWWMi <br />permanent pool and nonpermanent pool on the basis of their respective <br />volumes, with the permanent pool being assigned 4,300 acre -feet (5.3x10 <br />m of evaporation and the nonpermanent pool being assigned less than <br />3,300 acre -feet (4.1x10 m Had the permanent pool not existed, the <br />evaporation from the nonpermanent pool would have been about 3,650 acre - <br />feet (4.5x10 m This represents a net reduction of evaporation charge <br />to the nonpermanent pool of 350 acre -feet (4.3x10 m This reduction <br />is divided between Colorado and Kansas according to the compact. <br />Evaporation is negligible during the winter and only the permanent pool <br />exists during the summer of most years, but during the spring and fall <br />when both the permanent and nonpermanent pools occupy the reservoir, the <br />nonpermanent pool is generally charged for less evaporation than it would <br />have been had the permanent pool not existed. This method of proportioning <br />evaporation from the reservoir generally gives several hundred acre -feet <br />per year extra water to other users in the basin at the expense of the <br />permanent pool. <br />22 <br />