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<br />1049 <br /> <br /> Yie ld Percent <br />less than 800 gpm 99 <br />less than 500 gpm 92 <br />less than 400 gpm 74 <br />less than 300 gpm 56 <br />less than 200 gpm 22 <br />less than 100 gpm 5 <br /> <br />The volume of ground water withdrawn from individually-owned wells <br />during the two irrigation seasons was estimated using an equation provided by <br />the U.S.G.S. District Office. It is: <br /> <br />v = KWH x Q <br />RPS x KH x 19550 <br /> <br />where <br /> <br />v = <br />KWH = <br />Q = <br />RPS = <br /> <br />volume pumped in ac-ft <br />kilowatt hours used <br />yield of well in gpm <br />revolutions per second of the watt-hour <br />meter rotor <br />constant of the watt-hour meter. <br /> <br />KH,- <br /> <br />Watt-hour meters were read before and after the irrigation season except when <br />circumstances such as meter breakdown made readings valueless. In such cases <br />the volume pumped was estimated from average yield-volume pumped relationships. <br /> <br />The total ground water withdrawn during the 1968, 1969 and 1970 ir- <br />rigation seasons was 6180, 4120 and 3770 ac-ft, respectively. <br /> <br />- 9 - <br />