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<br />I <br />I. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />Ie <br />I <br />I <br />I <br />I <br />I <br />I <br />I. <br />I <br />I <br /> <br />analysis, the radial-flow correction on the Dawson and Denver aquifers will be performed. The <br />pumping groundwater levels from these analyses may be used as input to the economic analyses. <br />It is anticipated that a 50-year production period from 1997 to 2046 will be evaluated. <br /> <br />For each aquifer analysis under this task, the following specific tasks will be performed: <br /> <br />1. Obtain model input and output files from Banta (1989) or another appropriate investigator <br />to determine if simulated drawdown values are available for analysis. <br />2. Select the specific aquifer area and cell for analysis. The aquifer cell selected for analysis <br />should represent average aquifer conditions for the area of investigation. <br />3. Obtain data on initial aquifer conditions, pumping stresses, groundwater level and <br />drawdown over the simulation period. Create ~ hydro graph of drawdown values. <br />4. Perform the correction for drawdown in the model cell to drawdown in the well and <br />calculate corrected drawdowns and pumping water levels. Create a hydrograph of <br />pumping water level over the stress period. <br /> <br />5.1.3 Denver Basin Aquifer - Layered Radial Flow Production Analysis <br /> <br />Layered radial flow analyses will be performed on three Arapahoe aquifer wells. The <br />Arapahoe aquifer wells will be located in the northern metro area, the southern metro area and <br />south of the Palmer Divide. The geophysical logs for wells at these locations will be examined <br />and the sandstone and shale layers will be coded into a layered radial flow model. Pumping rates <br />and periods identical to the rates and periods used for the wells in the Denver Basin aquifer <br />finite-difference model will be simulated in this layered radial flow analysis. The regional aquifer <br />drawdown will be accounted for in this analysis. Drawdown will be calculated over the same time <br />period as the wells in the radial flow correction model. The layered radial flow analysis may <br />indicate that wells go dry before the end of the analysis period. It is assumed that if actual wells <br />go dry, additional wells will be installed so that production rates can be maintained. As additional <br />wells are installed, withdrawal rates from each well should then be adjusted to the desired total <br />production. In a radial model, this change in wellfield operation can be simulated by a reduction <br /> <br />14 <br /> <br />HRS WAfER CONSULTANTS, INC <br />