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<br />I <br /> <br />I <br /> <br />I <br />I <br />I <br /> <br />The calculations in which minimum required diversions are determined take into <br />account the number of acres of land which are irrigated, the distribution of the <br />irrigated land among various crops, effective rainfall which partially meets crop <br />water requirements, conveyance losses in the canals and ditches of the irrigation <br />system, and on-farm efficiency of use of water, <br /> <br />I <br /> <br />The minimum required diversions can be compared to total diversions to determine <br />a full water requirement: for any given month and area, the larger of the two (the <br />actual diversions or the calculated minimum diversion requirement) is considered <br />to be the full water requirement (demand for water), The results of this analysis <br />demonstrate that, in the past, irrigators have been diverting as much water as <br />possible when available because shortages would frequently occur in the late <br />irrigation season. For this reason, they had a tendency to over divert in the spring, <br />With the proposed project, however, water will be delivered throughout the <br />irrigation season and it is reasonable to assume that irrigators will divert amounts <br />closer to their needs. For this reason, the calculated minimum diversion <br />requirements were used for analyses and in operation studies in this report, <br /> <br />I <br />I <br /> <br />I <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br /> <br />The demand for water in the Tongue Creek basin was determined by calculating the <br />"Minimum Diversion Requirement", The minimum diversion requirement (DR) from <br />a stream is the amount of water required to meet the crop irrigation requirement <br />and to account for the on-farm and system efficiencies, The crop irrigation <br />requirement (CIR) takes into account the number of acres of land which are <br />irrigated, the distribution of irrigated land among various crops, the consumptive <br />use of each crop and effective precipitation which partially meets the crop <br />consumptive use. <br /> <br />I <br /> <br />The minimum diversion requirement in acre-feet was calculated for each month <br />within the growing season, from April to October, using the following relationship: <br /> <br />I <br />I <br />I <br />II <br /> <br />DRi = <br /> <br />(C1Ri ) <br />Ef. Es <br /> <br />* <br /> <br />AREA <br />12 <br /> <br />III-13 <br />