Laserfiche WebLink
<br />. <br /> <br />2. Retrieve simulated Banta (1989) water levels over time for the cell containing the <br />well of interest. <br />3. Calculate estimated pumping water levels using the approximation described by <br />Prickett (1967) and Trescott et. al. (1976). This will be tenned the Trescott <br />approximation in this study. <br />4. Review hydrogeologic and geophysical data from the well to develop a <br />conceptual model of the well and the aquifer. <br />5. Develop a detailed cross-sectionai radial flow model for each well site. Use the <br />Multi-Completion Well (MCW) modute for MODFLOW developed by HRS to <br />simulate pumping from a single well completed in multiple aquifer zones. This <br />module calculates a single water level for a well completed in various layers of a <br />model. Documentation for the MCW Module is included in Appendix 1. <br />6. Simulate an aquiler test at the well and compare results from the radial flow <br />model to observed response during the test. Perfonn limited calibration to the <br />aquifer test as appropriate. <br />7. Simutate water levels in the pumping well and in the aquifer near the well for at <br />teast 50 years after 1995 while maintaining the regional water levels calculated <br />by Banta. <br />8. Compare pumping water levels estimated by the Trescott approximation and by <br />the radiat flow model to detennine when each method is applicable. <br />9. Use pumping water level estimates to derive expected operational costs for the <br />period from 1995 through 2045, Analysis will include pumping costs, well <br />maintenance, pump resetting, and drilling and equipping of supplementat wells. <br /> <br />. <br /> <br />6.0 Radial Flow Modeling Methodology <br /> <br />. <br /> <br />Radial Flow model conceptualization is quite similar to that discussed by Reilly <br />and Harbaugh (1993) in their paper discussing flow to a well using the MODFLOW <br />model. In our conceptualization, we have considered a system of 15 or more layers, 90 <br />columns, and one row. This allows us to think of layers as commonly discussed in <br />cross.sectional diagrams. Also, our simulations are based on a ten degree pie-shaped <br /> <br />16 <br />