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<br />" A computer model was used to estimate the effects of the <br />proposed Narrows Reservoir on the alluvial aquifer adjacent to <br />the South Platte River near Fort Morgan, Colo. Changes in <br />ground-water discharge to the river caused by the proposed <br />reservoir were estimated,assuming steady-state conditions. The <br />.proposed reservoir was simulated for two different reservoir <br />pool altitudes, For tile conditions simulated, the ptincipal <br />.effects of the proposed reservoir on the ground-water system <br />would be an increase in water table altitude in the aquifer and <br />a redistribution of ground-water discharge to the South Platte <br />River. . <br /> <br />The proposed reservoir would cause water-level changes in <br />the aquifer between Fort Morgan and the proposed dam. The <br />changei.nwater level at For,t"Mo,rganwas less than 1 foot <br />(0.3 meter) for the two reservoir conditions simulated. No <br />significant change in the groiJnd-water system would occur <br />downstream from Fort Morgan. <br /> <br />Ground-water discharge to. the South Platte River would be <br />decreased at the reservoir site and increased downstream from <br />the proposed reservoir. The model study indicates that <br />ground-water discharge would decrease by 24 cubic feet per <br />second (0.68 cubic meter per second) above the proposed dam <br />and increased by 24 cubic feet per second (0.68 cubic meter <br />per Second) below :the proposed dam for steady-state conditions <br />with the reservoir pool at 4,404 feet (1,342 meters). Ground- <br />water discharge would decrease by 11 cubic feet per second <br />(0.31 cubic meter per second) above .the proposed dam and increase <br />by 15 cubic feet per second (0.42 cubic meter per second) below <br />the prop.os.ed dam for steady-state conditions with the reservoir <br />,pool.at4,.a83.feet f1,336 meterS )." <br /> <br /> <br />: " -~ - :. <br /> <br />Status of. "Transient" Analysis <br /> <br />A check with the Geological Survey on December 14, 1977, indicates <br />that they are about 50 percent completed with their area ground-water <br />study. Various studies concerned with reservoir-bank storage capacities <br />and how they will be affected by seepage are being looked into. <br />Preliminary results indicate that seepage would be less than earlier <br />Bureau studies and the Geological Survey's "steady-state" analysis <br />would indicate. Final results from the "transient" study will be <br />pUblished by the Geological Survey in November 1978. <br /> <br /> <br />12 <br /> <br />'.' .~. -.- ., - ',"" . "0.'. <br /> <br /> <br />