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<br />I <br />I. <br />I <br />. <br /> <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 />5.1.2 Radial-Flow Correction Analysis <br /> <br />Robson, Banta and other investigators have performed groundwater flow modeling studies <br />of the Denver Basin aquifers. Regional groundwater flow modeling analysis of the Denver Basin <br />aquifers can provide reasonable estimates on the rate of annual regional groundwater level <br />declines. Previous analyses by Robson, Banta, and others have quantified regional groundwater <br />level declines in response to past and future groundwater production levels. A finite-difference <br />model divides the area of investigation into a model grid with model cells. In this task the <br />previously-calculated regional drawdown in a model cell will be corrected to estimate the <br />groundwater level in a well located in the middle of the model cell. <br /> <br />The drawdown correction will be performed at individual model cells in Banta's model <br />which are representative of an aquifer area. Radial-flow correction analyses may be performed at <br />the following locations: the Dawson aquifer in the southern metro area; the Denver aquifer in the <br />northern metro area, the southern metro area, and south of the Palmer Divide; and the Arapahoe <br />aquifer in the north metro area, the south metro area and south of the Palmer Divide. Corrected <br />drawdown values at the three Arapahoe aquifer locations will be compared to drawdowns <br />calculated at the same three Arapahoe aquifer locations using a layered-radial flow analysis <br />(section 5.1.3). A comparison of the drawdown values will be used to determine whether or not <br />the radial-flow correction analysis can be used to accurately determine Denver Basin aquifer <br />pumping water levels. <br /> <br />The cell-to-well radial flow correction analysis should first be performed on the three <br />Arapahoe aquifer well locations: the northern metro area; the southern metro area; and south of <br />the Palmer Divide. The layered-radial Arapahoe aquifer work described in the following section <br />will then be performed. If the results of the radial-flow correction analysis are significantly <br />different than the results of the layered-radial flow analysis and if an adjustment to the radial flow <br />correction cannot be obtained to accurately reflect the layered-radial flow results, then the <br />decision may be made not to perform the radial flow correction analyses on the other aquifers. If <br />the radial-flow drawdown in the Arapahoe approximates the layered-radial flow drawdown <br /> <br />13 <br /> <br />HRS WATER CONSULTANTS, INC <br />