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4.4.1.1 10 Meter DEM

As each 10 meter DEM covers an area of about 66 mi2, the DEMs were first merged and clipped so that the study areas were covered completely by the DEM.

For the large watershed an outlet was placed at the confluence with

Buttermilk.

The steps taken were those

delineation using CRWR-PrePro. thresholds chosen for each area.

Table

4.3

described earlier for watershed below outlines these data, and the

Watershed

Threshold

Cells in Watershed

Area/Cell

Area 1

4500

13895

100

Area 2

22500

43504

100

Area 3

90000

228578

100

Table 4.3: 10 Meter DEM Watershed Data

In a study conducted by Garbrecht et al. (1999b) on an agricultural watershed, digital elevation models were applied to the study areas with cells ranging from 5 to 500 meters. In this study the ratio of average subcatchment area to grid cell area was used as an indicator of spatial resolution. An overall catchment-to-grid ratio of 100 was found to be an acceptable threshold of spatial resolution for reasonable model result. For this reason this parameter has been incorporated into the analysis. Table 4.4 below outlines the physical parameters determined from this study using a 10 meter DEM.

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