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<br />MAY 1982 <br /> <br />(2) Veep percolation - The irrigation water which moves through and <br />below the root zone and is not available for plant growth. <br /> <br />(3) Runoff - The irrigation water leaving the field as surface flow and <br />discharging into drainage channels. Some runoff seeps from <br />tailwater pickup ditches or may be intercepted and reused. <br /> <br />(4) Crop Use (seasonal net application) - The water consumptively used <br />by the 'crop (evapotranspiration). It is the water supplied by <br />irrigation, exclusive of precipitation, that is stored in the root <br />zone for use by the plants and must be replenished periodically to <br />sustain plant growth. <br /> <br />(5) 'Onfarm Irrigation Efficiency (efficiency of irrigation) - Efficiency <br />is the crop use, less effective precipitation divided by farm <br />delivery multiplied by 100. <br /> <br />Table IV-2, results of the Water Hudget Analysis, compares the present <br /> <br />conditions with results expected from each of six alternative plans for <br /> <br />onfarm improvement. <br /> <br />Analysis reveals that present irrigation practice effectively provides <br /> <br />only 87 percent of crop consumptive use requirements. The estimated crop <br /> <br />consumptive use requirement for the 29,100 acres is 54,000 acre-feet per <br /> <br />year. Meeting crop consumptive requirement is an objective of the six <br /> <br />alternative plans; increasing the efficiency of irrigation while reducing <br /> <br />deep percolation to the maximum extent possible is another objective. <br /> <br />Reducing runoff by installing sprinkler irrigation systems or by adjusting <br /> <br />the flow rate, the time of set and the frequency of irrigation in surface <br /> <br />irrigation systems are key factors in increasing irrigation efficiency. <br /> <br />." <br />Ii (j \ S 1';- <br /> <br />IV-7 <br />