The watershed delineation process using CRWR-PrePro is summarized in fig. Vector streams and subwatersheds in the Sycamore Creek Watershed. The area of each subwatershed was converted to acres in a new field added to the attributed table. The 229 subwatersheds range in drainage area from 2.67 to 425 acres. The mean drainage area is 102 acres.
Land use lookup table.
The majority of the watershed is residential. The non-urban land is located in the headwaters of the watershed and along the creek. The generalized land use data was intersected with the subwatersheds shape file using the Geoprocessing ArcView Extension. The area was then converted to square miles and the land use areas were converted to percent land use plus one for use in the regression equations. The percent impervious area was also estimated on the basis of percent land use group in each subwatershed.