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<br />~.J <br /> <br />precipitation was determined using the USBR method3 and deducted <br /> <br />.. <br />-~-- - -fromtne-plant evapOtran-spiration to form the monthly crop irri:- <br />~ <br />gation requirement. The total monthly consumptive use or crop <br /> <br />irrigation requirement was determined by adding the individual <br /> <br />irrigation requirements. Finally canal, lateral, and farm losses <br /> <br />were calculated using the USBR estimates4 of 20 percent, 10 percent, <br /> <br />and 25 percent, respectively, and added to the total monthly crop <br /> <br />irrigation requirement to form the monthly headgate diversion <br /> <br />requirement. All climatological data were published records from <br /> <br />the Rocky Ford weather station except percent possible sunshine <br /> <br />c <br /> <br />data, which were from the Pueblo weather station. <br /> <br />Monthly headgate diversion requirements during the irri- <br /> <br />gation seasons of 1949-72 are shown on table 3. Diversion require- <br /> <br />ments have averaged 67,000 acre-feet or 3.59 acre-feet per acre, <br /> <br />and they have ranged from a low of 49,500 acre-feet or 2.65 acre- <br /> <br />feet per acre to a high of 80,700 acre-feet or 4.33 acre-feet per <br /> <br />acre. Cumulative frequency analyses were performed on actual <br /> <br />irrigation season diversions under the two Catlin direct flow <br /> <br />decrees and the diversion requirements during compact years 1949-72. <br /> <br />The results, which are illustrated on figure 1, indicate that diver- <br /> <br />sions equaled or exceeded the requirements during only about 44 <br /> <br />percent of the years. If shortages were avoided during the remain- <br /> <br />ing 56 percent of the years, water must have been obtained from <br /> <br />-other-sources=probablyfi:bliCfese-rvoii-s-t:ora-ge-, -from wells;-nor -lr-om-- <br /> <br />4 <br />