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<br />14 <br /> <br />~ <br />'~ <br />~ during the study period, compact years 1949-71, were <br /> <br />, ' <br /> <br />~ estimated using a method reported by Jensen, RObb, and <br />ol:>o <br /> <br />Franzoy.5 The method has been used successfully for <br /> <br />irrigation scheduling in several areas in the western <br /> <br />united States. Using the method, potential evapotrans- <br /> <br />piration is computed from solar radiation or percent <br /> <br />possible sunshine and mean air temperature. Plant <br /> <br />evapotranspiration during the desired period of time is <br /> <br />determined by multiplying the potential evapotranspira- <br /> <br />tion by the average crop coefficient. consequently, <br /> <br />the determination of consumptive use involves a series <br /> <br />of computations for each crop in the study area. <br /> <br />Table 1 shows information concerning the ditches <br /> <br />in Water District 67. The crops, acreages, and some <br /> <br />estimates of canal efficiencies were obtained by the <br /> <br />water commissioner for Water District 67 from ditch <br /> <br />company officials. Values of other losses were assumed <br /> <br />and compared with USBR (U. S. Bureau of Reclamation) <br /> <br />estimates of losses in other ditch systems upstream <br /> <br />from John Martin to check for reasonableness. The <br /> <br />amounts of the decreed water rights were obtained frOm <br /> <br />records at the Colorado Division of Water Resources. <br /> <br />./ <br />