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<br />To simulateYhe boundary conditions appropriate for this model, several different <br />types of boundaries were utilized= First, the areas to the east. and west (generally) . _ <br />- of the South Platte Valley is not part of the aquifer- system and so-were setup: for - <br />I <br />the most part- in the -model as no-flow boundazies. In this area, the cells aze <br />f :. inactive and . no computations aze carried out for these cells. To simulate the <br />^ <br />aquifer extending beyond the model domain to the west where Big Dry Creek <br />enters the valley, a set of constant head cells were established to simulate the' - <br />.. presence of aquifer-materials beyond. These cells act as a controlled source,o£---__ .-. __ . _ <br />water to the model;, much as the actual aquifer in that area can contribute water to <br />real life drawdown stresses occurring in the active model area. _At the north and <br />south ends of the mode] domain, there is similarly a continuance of the aquifer <br />beyond the model boundary. In the model these boundazies are also simulated <br />with constant head cells that provide two important functions. First, they assist in <br />establishing an accurate simulation of the water table at the north and south <br />extents of the model domain, and second, they provide water flow into and out of <br />the model to simulate the real Life flow of water in the alluvium from the south to <br />the north. <br />The aquifer parameters to be input to the model for each cell included initial head <br />(water table), bottom elevation, hydraulic conductivity, and the presence or <br />absence of any type of hydraulic stressor such as a stream cell or dewatering <br />drain. These data were derived directly from the two USGS references cited. <br />6 <br />Martin and Wood Water Consultants, Inc. <br />