If you are still using the "108 upd," plan your migration. As of 2025, USACE no longer supports the ArcMap version. New features (2D hybrid modeling, direct RAS Mapper integration) are only available in HEC-RAS itself or via HEC-GeoRAS for ArcGIS Pro.
Once water surface profiles are calculated in HEC-RAS, results are exported back to the GIS environment. HEC-GeoRAS intercepts these water surface elevations, intersects them with the underlying terrain grid, and generates flood inundation boundaries, depth maps, and velocity grids. Technical Compatibility Matrix hec georas for arcgis 108 upd
Obtain the HEC-GeoRAS version 10.x installer designed for the 10.x arcgis series. If you are still using the "108 upd," plan your migration
Older versions of GeoRAS often suffered from errors during the "RAS Geometry" processing phase, particularly regarding complex bank line intersections. Updates to the 10.8 version address these, offering a more stable environment for creating the GIS Input File ( or similar GIS formats). Key Features of HEC-GeoRAS in ArcGIS 10.8 Once water surface profiles are calculated in HEC-RAS,
: Download the compatible version (typically 10.8 or the latest version for ArcGIS 10) from the HEC-GeoRAS downloads archive . Data Preparation
Important: The installation file is typically named HEC-GeoRAS_1021_Setup.exe . There is no separate "upd" file for 108 beyond this; 10.2.1 is the cumulative update for the 10.2 series.
For 2D modeling, real-time results visualization, and automated floodplain mapping without switching between software. Troubleshooting ArcGIS 10.8 Issues If you encounter errors, check the following:
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