The Impervious Surface Analysis Tool (ISAT) is an extension for ArcGIS which calculates the percentage of impervious surface area within a specified geographic area (i.e., watersheds, municipalities, subdivisions). ISAT results can also be used to predict how different management strategies could impact local water quality.
While there are a spread of high and low relative percentage impervious surface values throughout the watershed, even so, all areas in the watershed are still classified as protect impervious, meaning that the percentage of impervious surfaces in the area are not large enough to impact water quality in a significant way.
Suggestions 1) Higher resolution CCAP land cover data. 2) Updated census block data, 2000 data is 10 years old. Many areas in southern Brunswick county have grown rapidly in those 10 years.