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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 5-7: PUMPING HOURS REQUIRED TO MEET PEAK MONTHLY <br /> AND SEASONAL CROP IRRIGATION REQUIREMENTS <br /> FOR CORN FOR 122 ACRE PIVOT <br /> WELL HOURS TO MEET PEAK HOURS REQUIRED TO MEET <br />CAPACITY, GPM MONTHL Y DEMAND (76.8 SEASONAL WATER REQUIREMENT <br />ACRE-FEET) FOR CORN' (239 ACRE-FEET) FOR CORN2 <br /> 500 834 (July only has 744 hours) 2607 <br /> 550 758 (July only has 744 hours) 2370 <br /> 600 695 2172 <br /> 650 642 2005 <br /> 700 596 1862 <br /> 750 556 1738 <br /> 800 521 1629 <br /> 850 491 1533 <br /> 900 463 1448 <br />Footnotes <br />1. The peak monthly demand for corn as determined by using the Blaney.criddle method <br /> was determined to be 6.42 inches for July, see Table 5-2. The volume of water requirEd <br /> to meet that demand is estimated to be 7.55 inches during the month of July, assuming <br /> an irrigation efficiency of 85 percent (6.42 inches/0.85). This is equivalent to 76.8 acre- <br /> feet for a 122-acre center pivot (7.55 inches x 122 acres/12 inches/ft.). <br />2. The number of hours required to operate an irrigation well to satisfy the seasonal water <br /> requirement for corn is determined by dividing the total volume, 1.96 acre-feet per acre <br /> (1.67 acre-feet per acre, presented in Table 5-2 divided by an irrigation efficiency of 85 <br /> percent). Based upon this seasonal requirement, a 122-acre pivot will require 239 acre- <br /> feet per season (1.96 ac. ft.lacre x 122 acres). <br /> <br />V-11 <br />