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30.0 <br />29.5 <br />r <br />a� <br />29.0 <br />a� <br />ca <br />28.5 <br />28.0 <br />B2ES <br />PW <br />A15ES C15WS <br />E16SPR <br />D135W <br />Slough S <br />SPR <br />0 100 200 300 400 <br />Distance from Pumping Well (m) <br />Figure 5 — Transect of initial water level before initiation of stream/aquifer analysis <br />test at the Tamarack State Wildlife Area near pumping well R3. A15ES, B2ES, <br />C15WS, D135WS, and E16SPR are observation wells depicted in Figure 4. SPR <br />refers to the South Platte River and PW is the pumping well. <br />In general, water levels in the observation wells decline rapidly during the first ten <br />to thirty minutes after initiation of groundwater abstraction. The measured drawdown <br />response in observation wells A15ES and B2ES are shown in Table 3. Analytical <br />solutions used for inversely estimating the streambed hydraulic conductivity assume that <br />the head in the surface water body does not change during the pumping test. During the <br />first ten hours of pumping, the water level in the slough declined by less than 0.01 m. <br />The water level then changed by as much as 0.1 in during the remainder of the pumping <br />test. Depletion of the water level in the slough is observed due to groundwater <br />abstraction from pumping well R3. In fact, total depletion of the slough channel is often <br />observed at the site when multiple pumping wells are operational. Water levels are also <br />measured in the South Platte River. Throughout the duration of the pumping test, the <br />water level in the river declined by less than 0.01 m. <br />