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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 /> TABLE 5-9: PUMPING HOURS REQUIRED TO MEET PEAK MONTHLY <br /> AND SEASONAL CROP IRRIGATION REQUIREMENTS <br /> FOR SORGHUM FOR 122 ACRE PIVOT <br /> WELL HOURS TO MEET PEAK HOURS REQUIRED TO MEET <br /> CAPACITY, MONTHLY DEMAND (77.6 SEASONAL WATER REQUIREMENT <br /> GPM ACRE-FEET) FOR SORGHUM1 (202ACRE-FEET) FOR SORGHUM2 <br /> 500 843 (July only has 744 hours) 2200 <br /> 550 766 (July only has 744 hours) 2000 <br /> 600 702 1833 <br /> 650 648 1692 <br /> 700 602 1571 <br /> 750 562 1467 <br /> 800 527 1375 <br /> 850 496 1294 <br /> 900 468 1222 <br />Footnotes <br />1. The peak monthly demand for sorghum as determined by using the Blaney-Criddle <br /> method was determined to be 6.49 inches for July, see Table 5-2. The volume of <br /> water required to meet that demand is estimated to be 7.63 inches during the month of <br /> July, assuming an irrigation efficiency of 85 percent (6.49 inches/0.85). This is <br /> equivalent to 77.6 acre-feet for a 122-acre center pivot (7.63 inches x 122 acres/12 <br /> incheslft.). <br />2. The number of hours required to operate an irrigation well to satisfy the seasonal <br /> water requirement for sorghum is determined by dividing the total volume, 1.66 acre- <br /> feet per acre (1.41 acre-feet per acre, presented in Table 5-2 divided by an irrigation <br /> efficiency of 85 percent). Based upon this seasonal requirement, a 122-acre pivot will <br /> require 202 acre-feet per season (1.66 ac. ft.lacre x 122 acres). <br /> <br />V-13 <br />