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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />In1 <br /> <br />Chapter 3 <br /> <br />WATER <br /> <br />WATER REQUIREMENTS <br /> <br />Project improvements are needed to improve water delivery efficiency <br />and to provide the maximum water supply obtainable to existing served <br />lands. Project water requirements were determined as the sum of farm <br />delivery requirements and canal losses. The company does not supply <br />water for municipal and industrial use, <br /> <br />NET IRRIGATION REQUIREMENT <br /> <br />The water requirements of the service area are based on analysis of <br />land classifications, crop projections, and water duty reflecting cur- <br />rent irrigation practices, <br /> <br />Monthly net irrigation requirements were developed from consumptive <br />use less precipitation for the project area and are tabulated in Table <br />7, Consumptive use was estimated using the Blaney-Criddle Method, <br />The resulting net seasonal irrigation requirement for the major crops <br />are: Maize/Mila 1.30 feet. and Alfalfa 2.17 feet. All other crops, <br />ie, corn, winter wheat, spring barley. etc., are assumed to have the <br />same irrigation requirement as maize/milo, <br /> <br />LATERAL DELIVERY REQUIREMENT - AVERAGE PRECIPITATION <br /> <br />The lateral delivery requirements with average precipitation were cal- <br />culated using an estimate irrigation efficiency of 65%. The resulting <br />average lateral delivery requirements for milo and alfalfa are thus <br />2.00 and 3,33 feet, respectively, as shown on Table 7. Because the ir- <br />rigation of the minor crops are not significantly different from milo, <br />the weighted average irrigation requirements are based on milo and al- <br />falfa, Thus for 43 percent alfalfa and 57 milo with 65 percent farm <br />efficiency. the average weighted lateral delivery requirement is 2.57 <br />feet per growing season. The estimated irrigation efficiency of 65% <br />is expected to be unchanged by the project. <br /> <br />The weighted unit farm delivery requirement applied to the 35,000 ir- <br />rigable acres would require a total farm delivery of 89.950 feet. Since <br />the average year water supply is only 61,700 acre-feet. in the average <br />year only 24.000 acres can receive a full water supply. The water is <br />made available to all 35.000 acres, The individual farmers determine <br />the number of acres on which they will apply the water. <br /> <br />WATER LOSSES <br /> <br />Existing water losses within the Amity System are primarily canal losses <br />and ~eaking through existing gates. Combined existing seasonal losses <br /> <br />3-1 <br />