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<br />O=lagG <br /> <br />the aquifer during the irrigation season must be replaced. Much of this <br /> <br /> <br />recharge could be accompl ished from river flow and controlled surface <br /> <br /> <br />application during the non-growing season. Artificial recharge by impound- <br /> <br /> <br />ing in small basins appears to offer little potential. <br /> <br /> <br />Aquifer transmissibility and specific yield dictate the areas where <br /> <br /> <br />ground water can be best developed. Several of the ditches in the valley <br /> <br /> <br />follow along the bedrock contour and thus have limited ground water <br /> <br /> <br />potential. Table I and Figures 4 through 8 show the estimated usable <br /> <br /> <br />ground water storage under the major ditches along the Arkansas River <br /> <br />from Pueblo to the Colorado-Kansas State I ine. This information is <br /> <br /> <br />needed to analyze the feasibil ity of conjunctive use of ground and surface <br /> <br /> <br />water. Basic data for the compilation was obtained from the U.S. Geological <br /> <br /> <br />Survey. <br /> <br /> <br />Investigations conducted by the U.S. Geological Survey reveal areas <br /> <br /> <br />where pumping has caused a water table drawdown in excess of ten feet. <br /> <br />This is generally where there is an over-abundance of wells in relation <br /> <br /> <br />to recharge capability from the river and lands irrigated by direct <br /> <br /> <br />surface diversions. If there were no hydraulic connection between the <br /> <br /> <br />river, drawdown in the alluvial aquifer would be much greater than that <br /> <br />evidenced. <br /> <br />SURFACE WATER INVESTIGATIONS <br />Investigations were made of the Canon City flows and the flows at <br />the state line for the study period of 1924-1966, inclusive. This <br />period was selected because it reflects flows at the two points prior <br />to and after the construction of John Martin Reservoir and releases there- <br />from in accordance with the compact. Also, the flows during the latter <br />part of the study period were analyzed to show variations since 1950 in <br />inflow and outflow, if any, when well pumping became significant. <br />The Canon City station was selected because of its strategic location <br />and because this station's records may be used to develop a formula to <br />permit junior upstream water rights to divert water against downstream <br />senior rights if the use of junior wells in the lower basin contributes <br />to calls on the rights above Canon City. Bypasses and other influences <br />on the recorded flow at the Canon City gage during the study period <br />necessitated correcting the recorded flows by adding the diversions by <br />the Canon City Hydraul ic Ditch, the South Canon Ditch, the Southern <br /> <br />- 13 - <br />