Abstract
Watershed management is a complicated process. A web-based spatial decision support system (SDSS) was developed to assist with watershed hydrologic/water quality assessment for present and future land uses. The SDSS was comprised of an integration of web–based programs, a hydrologic model, GIS and databases. The SDSS uses web-GIS capability for Internet map browsing, real time web-based watershed delineation and hydrologic spatial data extraction to prepare input data for Long-Term Hydrologic Impact Assessment (LTHIA) model operation. A watershed in suburban West Lafayette, IN undergoing urbanization was selected to illustrate the SDSS capability and to evaluate land use change impact on direct runoff and nonpoint source pollution. Although watershed management includes complicated steps and the online SDSS has restrictions due to the web environment, this web-based SDSS has potential applicability in assisting with watershed management decisions. The SDSS is operational for supporting local communities, regional consulting companies and other stakeholders at http://pasture.ecn.purdue.edu/~watergen.
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