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<br />~ ",', <br />(; j. \j ,: <br /> <br />PRELlHINARY ANALYSIS <br /> <br />A preliminary model was made to determine the area that would be <br /> <br />affected by the proposed Narrows Reservoir. <br /> <br />2 2 <br />A uniform, l-mi (2.6-km) <br /> <br />grid was used to discretize the modeled area which extended 16 mi <br /> <br />.. <br />(28 km) west and'21 mi (34 km) east of the proposed dam. To the north <br /> <br />and south, the modeled area extended to the valley boundaries of the <br /> <br />South Platte River. <br /> <br />The change in water-surface altitude within the proposed reservoir <br /> <br />was superimposed on a static water-table aquifer (horizontal water-table <br /> <br />surface) so that changes in the water-table surface caused by the <br /> <br />proposed reservoir could be simulated. A uniform hydraulic conductivity <br /> <br />of the aquifer was assumed and evapotranspiration was not considered. <br /> <br />Grid points within the proposed reservoir and along the South Platte <br /> <br />River were assigned constant-head values. <br /> <br />The results of this model run helped to plan the grid system for <br /> <br />the final model runs. Results shOl<led that the effects of the proposed <br /> <br />reservoir did not extend much further east than Fort Horgan and had <br /> <br />small effect further west than the end of the proposed reservoir. A <br /> <br />large part of the ground-water flow from the proposed reservoir passed <br /> <br />through the grid point next to the dam, indicating that the model should <br /> <br />have more detailed refinement in the vicinity of the dam. <br /> <br />/3 <br />