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<br />POTENTIAL CROP CONSUMPTIVE USE <br /> <br />The total potential consumptive use under the Keesee Ditch was based on the <br /> <br />assumption that there were 1,400 acres irrigated. This figure of 1,400 acres <br /> <br /> <br />was used because that is the decreed figure, even though it is recognized that <br /> <br />approximately 2,000 acres have been irrigated for many years. All of the land <br /> <br /> <br />under the Keesee Ditch is owned by one individual, who reported that the crop <br /> <br /> <br />mix under,the ditch has been 70% alfalfa, 10% corn, 10% wheat, and 10% milo. <br /> <br />In order to determine the consumptive use under the ditch, the modified <br /> <br /> <br />Blaney-Criddle method was used to calculate the potential consumptive use by <br /> <br /> <br />each of the crops 1 isted above for the period 1970-1979. The modified Blaney- <br /> <br /> <br />Criddle methoq is the standard method for making such calculations in this area. <br /> <br /> <br />Appendix I is 'a copy of the computer printout sheets for these calculations. <br /> <br />CONCLUSIONS <br /> <br />In order ,to determine the appropriate method for calculating the historic <br /> <br /> <br />consumptive use under the Keesee Ditch, a comparison was made between the poten- <br /> <br /> <br />tial consumptive use of the irrigated crops and the irrigation del ivery or <br /> <br /> <br />amount of water available for those crops to use. This comparison was made for <br /> <br />the period 1970-1979. Table I I is a tabulation of the potential consumptive <br /> <br /> <br />use values and the irrigation del ivery values for each month during those years. <br /> <br />As can be seen from the total values for each year on Table I I. the amount <br /> <br /> <br />of water available to the crops ("delivery") is generally somewhat different <br /> <br /> <br />than the full needs or potential consumptive use of the crops. Since the crops <br /> <br /> <br />cannot use more water than is available or more than the potential consumptive <br /> <br /> <br />use. the actual consumptive use in each year is equal to the lesser of the two <br /> <br /> <br />total values for that year. The average actual consumptive use for the period <br /> <br /> <br />1970-1979 is 2.910 acre-feet (Table I I). Applying the ratio between this number <br /> <br /> <br />and the average diversions by the Keesee Ditch in the period 1970-1979 <br /> <br /> <br />(4.992 acre-feet) to the average diversions by the ditch in the period 1950-1980 <br /> <br /> <br />(4,454 acre-feet) the average actual consumptive use for the period 1950-1980 is <br /> <br /> <br />calculated to 'be 2.596 acre-feet. <br /> <br />- 3 - <br />