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HEC-GeoRAS is a set of tools (toolbar) for use in a GIS environment. It provides an interface between ArcGIS and HEC-RAS software. It is designed specifically to process geospatial data for use in RAS modeling and to process RAS results into a GIS environment. Processing terrain information and other GIS data in ArcGIS using GeoRAS allows creating and exporting a geometry file for RAS analysis. The geometry file created contains river, reach and station information, cross-section cutlines, bank stations, reach lengths for left and right overbanks and channel, roughness coefficients and also can contain blocked obstructions, limited culvert and bridge information, ineffective flow areas and storage areas. The results from RAS simulation (e.g. water surface profiles) can be exported into a GIS environment and further analysis can be performed using the GeoRAS toolbar. The GIS data exchange between RAS and ArcGIS is done through a specifically formatted GIS data exchange (*.sdf) file. To utilize current capabilities of GeoRAS requires both 3D Analyst and Spatial Analyst extensions.