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confluence. The increases in streamflow can likely be accounted for by contributions from Wilsan <br />Creek (about one mile downstream from the Park Center Well), from discharge to the stream <br />from thinning alluvial deposits or from ground water discharge into Fourmile Creek in the mile <br />before the lower gage. In the last mile before the gage, Fourmile Creek flows across the <br />floodplain alluvium of the Arkansas River, and shallow ground water in the alluvium likely <br />contributes to surface flow of Fourmile Creek. The loss of 3.6 cfs in ldlarch 1994 is likely mostly <br />attributable to diversions for irrigation rather than losses to the underlying shallow aquifer. It is <br />notable that these stream flow measurements were made during a period when the Park Center <br />Well was being pumped at a rate equal to about 127 gallmin, or about 19 acre-ft per month. <br />Date Flow st 6esd of <br />Fourmile Creek Flow at cont]uence <br />with /etlcanass River Gsin or ]oas <br />Dec. I993 5.66 cfs 5.83 cfs +0.17 cfs <br />Jaa. 1994 6.22 cfs 6.90 cfs +0.58 cfs <br />Feb. 1994 6.11 cfs 5.66 cfs +0.45 cfs <br />Mar. 1994 7.20 cfs 3.60 cfs -3.6 cfs <br />Figure 5. Streamflow data at Fourmile Creek at head near Victor, Colorado and at <br />confluence with Arkansas River Near Canon City, Colorado (source: Ugland, et al. , <br />1994) <br />The stream flow data indicates that there is no significant loss in streamflow along Fourmile <br />Creek and it is most likely that the streamflow is nearly constant or possibly slightly increasing <br />through Garden Park above Park Center Well, Due to the location of stream gages on Fourmile <br />Creek, streamflow measurements available from the USGS are inconclusive as to whether or not <br />there is a contribution to streamflow from deep aquifers in the Garden Park area. Any streamflow <br />loss in Fourmile Creek is minor and could be masked by gains in stream flow below Wilson <br />Creek. The minor losses would only be sufficient to recharge shallow aquifers. <br />Effects of Pumping the Park Center Well <br />Because of the great thickness of low permeability strata between the producing zone in the lower <br />Fountain Formation and, Fourmile Creek there is no hydrologic connection, and the stream <br />depletion factor is zero, because pumping will not deplete any of the streamflow in Fourmile <br />Creek. <br />'The potentiometric surface of the deep aquifer is at about 350 ft. above land surface. Any <br />leakage of the confining beds via fractures would thus force water to move upward. It is <br />doubtful that upward leakage would extend 27(h°1 ft. to the surface and contribute ground water <br />discharge to Fourmile Creek, A visual reconnaissance of Fourmile Creek north of the well site <br />did not indicate that streamflow was increasing. Unless pumping of the Park Center Well is <br />increased dramatically, the potentiometrie surface of the aquifer will remain above the ground <br />6 <br />