If automated floodplain delineation fails, a manual raster-based approach provides a reliable alternative:
Before installing HEC-GeoRAS for ArcGIS 10.8, ensure you have: hec georas for arcgis 10.8
:
Set your ArcGIS workspace directory to a simple, short path directly on your local drive (e.g., C:\Project_RAS\ ). Geometric overlapping causes invalid hydraulic networks. If automated floodplain delineation fails
Imports computed HEC-RAS water surface profiles back into ArcGIS to map flood boundaries and water depth. Compatibility and Version Matching hec georas for arcgis 10.8