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Parameter Sensitivity in Hydrologic Modeling - page 88 / 163

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The following table, Table 4.6, outlines the DEM derived parameters from this study using a 30 meter DEM.

(mi)

Path (mi)

Slope (%)

4.06

1.50

1.26

8.16

3.06

1.39

19.08

6.78

0.76

Table 4.6: 30 Meter DEM in ArcView Results

Perimeter Longest Flow

Watershed Area 1 Area 2 Area 3

Area (mi2) 0.54 1.68 8.84

4.4.2

Automated Methods Using WMS

The second part of the DEM-based analysis examines using WMS to delineate both the 10 meter and 30 meter DEMs. Results from the WMS analysis are expected to give slightly different results than with ArcView GIS 3.2 and CRWR-PrePro, because different algorithms are used to extract the hydrologic parameters.

4.4.2.1 10 Meter DEM

The 10 meter digital elevation data used for the WMS study are the same as those used for the CRWR-PrePro study. The same grid that was clipped for the CRWR-PrePro study was imported into WMS as a grid ascii file using the import data command. Once this was done the DRG for the area was placed in the background to locate the study area. Flow direction and flow accumulation grids

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