G.I.S. Applications in Nonpoint Source Pollution Assessment

by Paul A. DeBarry, R.K.R. Hess Associates, East Stroudsburg, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


A Geographic Information System (GIS) provides a flexible tool for developing the oftentimes cumbersome soils and land use mapping database required in watershed storm water management and nonpoint source pollution assessment. Utilization of the coverage overlay system and corresponding attribute tables associated with the coverages, parameters required in hydrologic modeling such as computer S.C.S. runoff curve numbers can be easily computed. By inputting nonpoint source pollutant export coefficients based upon land use and soil type into the GIS attribute tables, nonpoint source loading rates can be determined for that watershed or any particular area within the watershed and critical areas identified.

Subject Headings: Soil pollution | Nonpoint pollution | Water pollution | Geographic information systems | Information systems | Watersheds | Computer models | Soil analysis | South Carolina | United States

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