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aquifer stress during pumping. The influence of the pumping well extends beyond the <br />slough. At the end of the test, the influence of the pumping well is beginning to reach the <br />South Platte River and it is expected that continual pumping will eventually result in <br />depletion at the river. <br />of e <br />29.5 <br />a� <br />29.0 <br />a� <br />c� <br />28.5 <br />28.0 <br />C15WS <br />B2ES <br />Al5ES Slough D135WS E16SPR <br />SPR <br />—0 Initial Water Level <br />f Water Level at End of Test <br />0 100 200 300 400 <br />Distance from Pumping Well (m) <br />Figure 8 — Transect of the water level after the stream/aquifer analysis test at the <br />Tamarack State Wildlife Area near pumping well R3 and comparison with the <br />initial water level. A15ES, B2ES, C15WS, D135WS, and E16SPR are observation <br />wells depicted in Figure 4. SPR refers to the South Platte River and PW is the <br />pumping well <br />An interesting consideration is the stream/aquifer interaction that occurs during <br />normal operation of the managed recharge project, such that all the pumping wells shown <br />in Figure 1 will be extracting water and recharge will be occurring from the infiltration <br />ponds. The combined influence of each of the pumping wells is expected to create a <br />stream/aquifer interaction scenario where flow is being depleted from both the slough and <br />South Platte River simultaneously. Also, with the restrictive layer in the sloughbed being <br />approximately 50 cm thick, drawdown due to a number of pumping wells is expected to <br />perch the slough above the alluvial aquifer, converting the slough from a constant head <br />boundary condition to a specified flux boundary condition. More research is needed to <br />determine whether such a perching of the slough channel occurs with recharge water <br />from the infiltration ponds possibly circulating to partially satisfy the aquifer stress. <br />13 <br />