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<br />In addition, pumpages from each well were overestimated. It is most <br />likely that the total yearly pumpage from each well will average less than <br />35 gpm, and that the wells will not necessarily pump continuously for the <br />entire year, as modeled. Pumpage may decrease during the non-irrigation <br />season when replacement water needs and operational requirements are low. <br />Model Design <br />1. Boundary <br />The model outline was defined by three hydrologic boundaries: the <br />C~ <br />Trout Creek outcrop to the southwest, south, east, and north; the Yampa <br />River to the north; and an arbitrarily chosen boundary to the north and <br />northwest which was located far from both mine sites yet within the <br />regional hydrologic and drainage basins (Driver et al, 1984). <br />2. Grid <br />The grid was developed to maximize definition around areas of highest <br />pumping stress. Grid blocks with 1/8 mile sides were used in areas of <br />anticipated high gradients (i.e. pumping wells). Farther away from the <br />pumping wells, the grid coarsens to a maximum size of 2 miles per grid <br />block side. The grid lines are not oriented parallel to north. <br />3. Boundary Conditions <br />The model uses three types of boundary conditions: 1) a NO-FLOW <br />n <br />boundary was used immediately outside the Trout Creek outcrop area and <br />also along the north-northwestern edge of the model to approximate a flow <br />line (i.e. no flow across the boundary), 2) a CONSTANT-HEAD boundary was <br />8333003.004 <br />3 <br />r'n~Tr~rr ir~r <br />