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To simulate the 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 />the most part in the model as no-flow boundaries. In this area, the cells are <br />inactive and no computations are carried out for these cells. To simulate the <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 of <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 model domain, there is similarly a continuance of the aquifer <br />beyond the model boundary. In the model these boundaries 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 />