Unlike simple line drawing, HEC-GeoRAS requires attribute data. Here’s how to assign them in ArcGIS 10.8:
If you describe your specific modeling goal (e.g., floodplain mapping, dam break, bridge hydraulics), I can suggest whether GeoRAS on 10.8 is the right choice or if an alternative is better. hec georas for arcgis 10.8
HEC GeoRAS is a GIS-based tool developed by the US Army Corps of Engineers that enables users to create, edit, and analyze watershed and floodplain data. With HEC GeoRAS, you can: Unlike simple line drawing