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<br />16 <br /> <br />,', <br />:~.{~' <br /> <br />o <br />'"=' <br />W <br />c...:} <br />tV <br />m <br /> <br />were obtained from the ARS. <br /> <br />Table 3 shows the <br /> <br />equations that were used and the assumptions that were <br /> <br />required to make the computations. The assumptions <br /> <br />were checked with the water commissioner to be sure <br /> <br />that they are reasonable. <br /> <br />Monthly headgate diversion requirements were then <br /> <br />determined by deducting the effective precipitation <br /> <br />from optimum evapotranspiration requirements to obtain <br /> <br />the irrigation requirements and dividing the irrigation <br /> <br />requirements by the canal, lateral, and farm effi- <br /> <br />ciencies. Effective precipitation was determined from <br /> <br />the average of monthly precipitations, which were mea- <br /> <br />sured at John Martin Dam, Lamar, and Holly and obtained <br /> <br />from USWB records, using the method recommended by the <br /> <br />USBR. 7 <br /> <br />Table 15 shows the 'combined monthly headgate <br /> <br />diversions of the nine ditches in COlorado during the <br /> <br />study periOd. The source of the data was the annual <br /> <br />reports of the Arkansas River Compact Administration <br /> <br />except that the source of the data for 1949 was the <br /> <br />reports of the Arkansas Valley Ditch Association. <br /> <br />Diversions during the study periOd have been variable <br />