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Figure 3 — Slough channel at the Tamarack State Wildlife Area. <br />3. Stream /Aquifer Analysis Test <br />In addition to the falling -head permeameter tests, a stream/aquifer analysis test is <br />performed at the Tamarack site. Field measurement of the streambed hydraulic <br />conductivity using falling -head permeameters gives a point measurement. Research has <br />indicated that streambed conductivity can vary significantly in both the horizontal and <br />vertical directions within a streambed. As suggested by Hunt et al. (2001), observed <br />drawdown in one or more observation wells located between a pumping well and stream <br />can be used with analytical solutions that account for streambed conductivity to inversely <br />estimate both aquifer and streambed hydraulic properties. The use of analytical solutions <br />provides a mechanism for congregating point measurement variations into a single <br />estimate more aligned with the input requirements of numerical ground water flow <br />models. Only three such field tests have been documented: one analyzed by Hunt et al. <br />(2001), another by Nyholm and Christensen (2000), and one presented by Nyholm et al. <br />(2002). Therefore, the objective of this stream/aquifer analysis test is not only to <br />investigate surface water /groundwater interaction scenarios at the Tamarack site, but also <br />investigate the use of complex analytical solutions for estimating streambed conductance. <br />The location and setup for the stream/aquifer analysis test is shown in Figure 4. <br />C <br />