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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br /> <br />indicated from the diagram, was about llO,OOO acre-feet per year. <br />John Martin Reservoir began storing In 1943 and the use of correlations <br />prior to this time would not be realistic, unless corrected for <br />potential storage, because of the benefits derived from storage in <br />thIs reservoir. <br /> <br />A second study of mass diagrams on an annual basis, using <br />Irrigation season diversions and winter diversions also revealed a <br />reduction in the combined surface diversions of about 110,000 acre- <br />feet per year. <br /> <br />When the water pumped from wells was included In the mass <br />diagrams, as a third study, the inflow at Pueblo and the total water <br />used for Irrigation by the three methods were in agreement. Thus, <br />this analysis indicates that the withdrawals by wells of about l20,000 <br />acre-feet per year reduced the surface diversions by 110,000 acre-feet. <br /> <br />It was suggested that the above analysis might be Inconclusive <br />because tributary inflow between Pueblo and La Junta had been ignored. <br />A number of studies were then made which incorporated tributary Inflow, <br />and the results were so erratic that no meaningful conclusions could <br />be drawn therefrom. Tributary inflow is influenced to a large degree <br />by canals discharging unused water into several tributaries, and it is <br />recommended that automatic recorders be installed at the terminus of <br />all canals following this practice. <br /> <br />The timely distribution of the water supply upon crops and <br />crop yields is of extreme importance. For this reason, investigations <br />were made on a monthly basis of diversions by the Fort Lyon and Catlin <br />Canals. These studies indicated the same reduction in diversions in <br />the early 1950ls and thereafter, especially during the latter part of <br />the growing season. Thus, it is concluded that the use of wells has <br />materially reduced the water supply to these canals. During the months <br />of August and September, the Fort Lyon Canal diversions were reduced by <br />about 30 percent during recent years, and for the same months the Catlin <br /> <br />-4- <br /> <br />