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<br />';;-:~".'.., <br />.-."-~,-.: <br />. .~..~ <br /> <br />C',) <br />'-:-J <br />c.~ <br />C.~l <br />~ <br />W <br /> <br />13 <br /> <br />by increasing the length of time that the reservoir <br /> <br />contained storage. The monthly diversions at the Fort <br /> <br />Lyon headgate for the Great Plains system during Novem- <br /> <br />ber through March of compact years 1949-71 are shown in <br /> <br />table 14 and were obtained from the annual reports of <br /> <br />the Fort Lyon Canal Company. During the period they <br /> <br />average 15,000 acre-feet, but they range from none <br /> <br />during three years to 98,000 acre-feet in 1958. <br /> <br />Headgate diversion requirements are the diversions <br /> <br />at the ditch headgate that are required to supply the <br /> <br />crops with sufficient irrigation water for optimum <br /> <br />growth. They are determined, first, by estimating the <br /> <br />amount of plant evapotranspiration or consumptive use <br /> <br />associated with optimum growth. When that part of the <br /> <br />rainfall that is effectively used for evapotranspira- <br /> <br />tion is deducted, the result is the crop irrigation <br /> <br />requirements. Transportation and farm losses, which <br /> <br />include evaporation, seepage, and leaching requirements, <br /> <br />are added to form the headgate diversion requirements. <br /> <br />The amounts of monthly plant evapotranspiration <br /> <br />that were required for optimum growth of crops under <br /> <br />each of the nine ditches in Water District 67 <br />