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<br />OC1977 <br /> <br />Computer studies were also made of the inflow at the Canon City gage and <br /> <br /> <br />the outflow at the state line to determine trends for the three periods <br /> <br /> <br />mentioned above. Additional studies were made by use of mass diagrams, of <br /> <br /> <br />the diversions of selected ditches and canals to determine whether there <br /> <br /> <br />were any significant changes on the monthly basis. The average annual <br /> <br /> <br />inflow at the Canon City gage, corrected for diversions around the gage <br /> <br />and other influences,for the 1924-1966 period revealed an inflow at that <br /> <br /> <br />point averaging 518,000 acre feet per year. For the pre-John Martin conditions <br /> <br /> <br />(1924-1941) and for the remainder of the study period (1943-1966), excluding <br /> <br /> <br />the exceedingly high runoff years of 1942 and 1965, the inflow at Canon City <br /> <br /> <br />averaged at 478,000 and 524,000 acre feet, respectively; and the outflow <br /> <br /> <br />at the state line,194,000 and 175,000 acre feet, respectively. <br /> <br /> <br />The maSS diagram analysis of the state line flow versus the Canon <br /> <br /> <br />City flow shows an apparent loss during the 1951-1966 period of approximately <br /> <br />105,000 acre feet per year at the state line. The studies of the canal <br /> <br /> <br />diversions reveal a decrease of approximately 113,000 acre feet per year <br /> <br /> <br />during these recent years. At 60 per cent efficiency, the decrease. in con- <br /> <br />sumptive use is 68,000 acre feet per year. Thus, the total apparent decrease <br /> <br />is 173,000 acre feet per year when the depletions and reduced flow at the <br /> <br /> <br />state line are added. Ouring recent years the average annual amount of <br /> <br /> <br />water pumped from wells was reported to be 128,700 acre feet. WIth the <br /> <br /> <br />U.S. Geological Survey's estimate of 80 per cent consumptive use, the cOn- <br /> <br /> <br />sumptive use by wells would be 103,000 acre feet per year. <br /> <br />The masS diagram analysis of the monthly diversions by selected <br /> <br /> <br />canals reveal that these canal diversions have been materially reduced in <br /> <br /> <br />recent years in the late summer months. It is therefore apparent that any <br /> <br /> <br />conjunctive use of surface and ground water in the Arkansas River basin <br /> <br /> <br />must be carefully and accurately integrated to protect the water rights <br /> <br /> <br />of the surface users under the Appropriation Ooctrine. This conclusion <br /> <br />can best be illustrated by the following: It is estimated that from <br /> <br /> <br />40 to 50 per cent of the lands under the Fort Lyon Canal can be suppl ied <br /> <br /> <br />by 277 wells. These wells have a total capability of pumping approximately <br /> <br /> <br />420 cfs, which, if operated over a month's period of time, could pump <br /> <br />iii <br />