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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 />2. Water quality. <br />3. Limited extent of aquifer and storage therein. <br />4. Colorado-Kansas compact. <br />5. Relative velocities of surface and ground water. <br />6. Variance in headgate water requirements because of: <br />a. Canal, lateral and farm losses. <br />b. Cropping patterns. <br />c. Soil types. <br />d. Winter irrigation. <br />7. Frying Pan Arkansas Project water importation. <br /> <br />Associated with the above mentioned items is the lack <br />of records for a sufficient number of years covering specific <br />conditions to establ ish accurate trends. For example, the benefits <br />to senior appropriators from the John Martin Reservoir Project have <br />been altered by the continued increase in use of well water. This <br />has changed the regimen of return flow to the stream. <br /> <br />The complex interrelationship of the numerous factors which <br />influence stream flow in the Arkansas River and its use cannot be <br />properly evaluated by conventional methods, and it seems probable that <br />any meaningful solutions must eventually be derived from the use of <br />analog and digital computors. Fortunately, the U. S. Geological Survey, <br />in cooperation with the Colorado Water Conservation Board and the South- <br />eastern Colorado Water Conservancy District, have constructed an analog <br />model for the Arkansas River Basin from Pueblo to the State Line. <br />Data collected by the Geological Survey include the extent, depth, <br />permeabil ity and transmissibi1 ity of the aquifer, well locations, and <br />estimated annual pumpage. <br /> <br />-7- <br /> <br /> <br />Several preliminary multiple regression analyses were run <br />on a digital computor on a seasonal basis for the 1928-l965 period. <br />Data used in the analyses were those obtained from the Bureau of Re- <br />clamation along with hydrologic data derived by us and by others. The <br />purpose of the study was to determine the principal natural and man-made <br />