220.127.116.11 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
The steps taken were those
delineation using CRWR-PrePro. thresholds chosen for each area.
described earlier for watershed below outlines these data, and the
Cells in Watershed
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.