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Subpart B - Consumptive Use Requirements <br />V <br />C0683.12(e) <br />(c) Table C0683.52 lists the common irrigated crops in each <br />of the seven climatic zones, and gives the recommended design <br />peak consumptive use rates in inches per day for various net <br />depths of application. <br />(d) The irrigation frequency during peak period use may be <br />calculated by the formula:l/ <br />Irrigation Frequency in Days = Net Irrigation Application <br />Peak Period Daily Use- Rate <br />Example: <br />Grop: Corn (4 foot root depth) in climatic zone 2 <br />Soils: Billings clay loam 1-4% slope. <br />Available water: 50 percent of 7.92" = 3.96" or 4". <br />Net irrigation application: 4". <br />Daily peak period use with 4.0" net application is 0.25 inches <br />(Table C0683.52) <br />Irrigation frequency: 4.0 = 16 days <br />0.25 <br />(e) Once the frequency of irrigation is determined, it is <br />possible to design for ditch or pipeline capacities using the <br />same information. <br />Example: <br />Crop: Corn - 120 acres <br />Irrigation efficiency: 60 percent <br />Gross application: 4" net application @ 60 percent <br />efficiency: 4.0 = 6.7" gross application <br />0.6 <br />120 acres x 6.7" = 800 acre-inches every 16 days <br />800/16 = 50 acre-inches per day <br />50/24 = 2.08 acre-inches per hour <br />1/ For the irrigation frequency for periods other than the peak <br />use period, determine the average daily use rate from Table <br />C0683.51 and substitute this value for the peak period daily use <br />rate in the formula. <br />(C0210-V1-COIG, December 1988) <br />C0683-7