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convenient and efficient way to store both stream and basin data is through vectors and polygons (Nelson et al., 1997).

Figure 3.13 below shows an example of a watershed delineated from a grid-based digital elevation model (DEM).

Figure 3.13: 30 Meter Delineated DEM

The following paragraphs describe this process using both ArcView GIS 3.2 (with CRWR-PrePro) and WMS.

3.4.2

ArcView GIS 3.2

The Environmental Systems Research Institute, Inc. (ESRI) developed ArcView GIS 3.2. This has now been replaced by ESRI’s ArcGIS software package. ArcView GIS 3.2 is still very widely used in the professional world, and is examined in this study for the reason that the Texas Department of

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