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0 4.0 PRELIMINARY MODEL RESULTS AND CONCLUSIONS <br />A few general conclusions affecting recharge operations were derived from this <br />preliminary modeling effort <br />• Two distinctive groundwater flow processes are acting at this site. During <br />pumping and recharge of this very transmissive aquifer, a local hydrologic system <br />is created where the recharge mound and the pumping cone of depression merge <br />and dominate the local flow regime. This local flow system results in significant <br />re- pumping of recharge. Soon after pumping ceases, the eastward, regional flow <br />gradient resumes and dominates the flow of recharge water to the South Platte <br />River. <br />• Between 1997 and 2002 the Project pumped approximately 18,570 acre -feet of <br />water. Approximately 15,200 acre -feet were pumped to recharge ponds and 3,370 <br />acre -feet were pumped for the artificial stream and wetlands. When ET is held <br />constant with depth to groundwater the total Project accretions were 3900 acre - <br />feet of water. Project accretions decrease from 3900 acre -feet to 2,480 acre -feet <br />when accretions are limited to only those times when Tamarack operations are <br />called out. <br />. • River accretions calculated using the Image -Well Adjusted SDF Method where <br />SDF values were calibrated to match MODFLOW results correlated well with <br />MODFLOW results during the entire modeling period. <br />Finally and probably most importantly, this project is a site - specific study and the <br />Tamarack Recharge Project site is located in an area of unique hydrogeology. Because of <br />this unique hydrogeologic setting, any analysis or conclusions provided herein may not <br />necessarily apply to other areas within the South Platte Basin. <br />• <br />Page 7 of 8 <br />