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Figure 3.10: Map-Based Model in ArcView

3.4

CASE III: AUTOMATED METHODS USING A DEM

In Case III, hydrologic parameters are extracted from a grid-based digital elevation model (DEM) using both 10 meter and 30 meter DEM data. Two different processes are used to extract hydrologic parameters from elevation data. The first method involves using ArcView GIS 3.2 and CRWR-PrePro, while the second method extracts hydrologic parameters using the Watershed Modeling System (WMS). Both methods involve the same fundamental steps. These include 1) a raster-based terrain analysis, 2) raster-based sub-basin and stream network delineation, and 3) vectorization of the sub-basins and stream segments.

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