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- - - -- - <br />_.: .. the k/m ratio-and so being able to simply vary the one conductance value allows ° - <br />,_ ~... one to essentially vary-all the:composite values over a,range of reasonable values. - - <br />_ , , With the overallgeometry of the stream.within.each cell fairly easy,to.measure, .. . <br />- .. such sensitivity analyses really can be best addressed to the k/m values.. -::_ :.__ . <br />Once the basic grid was established, the data input for all cells, and the boundary <br />- conditions-and stream system defined, the next-step was.to establish a calibrated <br />_,._ ..,, _ ..._ steady-gtate yyater table thatmatched.the available.data,fromthe USGS_reports ,-..__... _,. <br />_ and maps. This was accomplished by setting an initial flat-lying head, adjusting <br />the constant head boundaries to match the incoming. and outgoing heads, .and <br />adjusting the genera[ head boundaries to approximate the genera[ gradient along <br />these boundaries. The model was then run under steady-state conditions and the <br />resultant head configuration-compared to the desired tazget head configuration. <br />This was repeated with slight adjustments to the boundary head conditions until a <br />suitable and close match was achieved. At this point, the model was considered <br />ready for the predictive simulations. It is noted that a match to a single historic <br />head contour configuration is not necessarily an ideal calibration for a model. <br />However, given the complex nature of the stresses on the system, which change <br />on a daily basis, this match is the only feasible target given the available data and <br />is considered appropriate for the engineering calculation model constructed for <br />this study. <br />8 <br />Marlin and Waod Water Consultants, Inc. <br />