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Specified Flow BC

GMS v5.0 includes a new source/sink type associated with MODFLOW conceptual models for simulating specified flow along a model boundary or polygonal region in the interior of the model.  Specified flow conditions can be assigned to both arcs and polygons.  In either case, the user specifies a total flow rate [L^3/T] for the object.  When the Map -> MODFLOW command is selected, the flow rate is partitioned along the cells coincident with the arc or polygon.  For arcs, the portion of flow assigned to a cell is factored by the length of the arc overlapped by the cell divided by the total arc length.  For polygons, the portion of flow assigned to the cell is factored by the area of the cell (or portion thereof assuming a partial overlap) divided by the total polygon area.  The flow rates are assigned to the cells in the form of wells.  This new option makes it possible to simulate well fields or lateral inflow on the model boundary.