Laserfiche WebLink
<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 /> <br />TABLE 5-5: PUMPING HOURS REQUIRED TO MEET PEAK MONTHLY <br />AND SEASONAL CROP IRRIGATION REQUIREMENTS <br />FOR CORN FOR 122 ACRE PIVOT <br /> <br />WELL HOURS TO MEET PEAK HOURS REQUIRED TO MEET <br />CAPACITY, MONTHL Y DEMAND FOR SEASONAL WATER REQUIREMENT <br />GPM CORN' FOR CORN2 <br />500 834 (July only has 744 hours) 2607 <br />550 758 (July only has 7-44 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 /> <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 1. The volume of water required to <br />meet that demand is estimated to be 7.55 inches during the month of July, assuming an <br />irrigation efficiency of 85 percent (6.42 inches/0.85). This is equivalent to 76.8 acre-feet <br />for a 122 acre center pivot (7.55 inches x 122 acres/12 inches/ft.). <br /> <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 1 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-9 <br />