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<br />o <br />a <br />(...) <br /><:;:> <br />..... <br />N <br /> <br />2 <br /> <br />The purpose of this study was to formulate an <br /> <br />operational plan for the irrigation features of John <br /> <br />Martin Reservoir that minimizes the water shortages of <br /> <br />the ditches in Colorado water District 67 and optimizes <br /> <br />its operation. This requires that the amounts of water <br /> <br />released just satisfy the requirements. including the <br /> <br />required deliveries to Kansas irrigators. with no <br /> <br />surplus. An equation is presented for use in the <br /> <br />operational plan that computes headgate diversion <br /> <br />requirements from mean air temperature and precipita- <br /> <br />tion data, and the equation allows the determination <br /> <br />of the release rates for irrigation purposes that are <br /> <br />required to satisfy the diversion requirements. The <br /> <br />adoption of this plan will reduce the crop damage that <br /> <br />results from water shortages and electrical power costs <br /> <br />that result from the use of irrigation wells to provide <br /> <br />supplemental water. <br /> <br />The determination of maximum release rates using <br /> <br />an equation that is based on air temperature and pre- <br /> <br />cipitation data is possibly too complex for practical <br /> <br />application so an alternative plan is presented that <br /> <br />is based on a maximum release rate for each month <br />