An Approach for Integrating GIS and Watershed Analysis Models

Abstract: The application of a dynamic watershed model requires efficient management and manipulation of large spatial and temporal data sets. Today's geographic information systems (GISs) offer many tools that can greatly facilitate the modeling process. The intention to link GIS and watershed analysis models has led to the design of an integrated system which is called GEO‐WAMS (Geographically Based Watershed Analysis and Modeling System). GEO‐WAMS has been designed as a modeling support system. It consists of five components: a GIS‐based spatial/temporal data management system, an integrated watershed modeling system, a data‐model management interface, an analyst support toolkit, and an interactive user interface. This paper introduces the general design of GEO‐WAMS as well as a more specific description of some of the capabilities that have been built into the GEO‐WAMS prototype system. The prototype couples a GIS (ARC/INFO) with a watershed loading model as well as a modified version of EPA's WASP4 model for simulation of dissolved oxygen in a receiving water body.