WMS:Quick Tour - Conceptual Model
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A conceptual model of the area your watershed exists in is created using a bounding polygon to define the limits of the area and stream arcs to identify the important channel data. The bounding polygon does not need to represent the actual watershed boundary; this will be determined later. The conceptual model will act like a "cookie cutter" in stamping out the region of the elevation data inside the polygon and then enforce the stream lines as triangle edges.