Hec Georas For Arcgis 10.8 2021

What is HEC-GeoRAS?

| Error Message | Probable Cause | Solution | |----------------|----------------|----------| | “Background processing failed” | 64-bit geoprocessing conflict | Disable background processing: Geoprocessing > Geoprocessing Options > Uncheck ‘Background Processing’ | | “No 3D Analyst license” | Extension not enabled | Go to Customize > Extensions > Check 3D Analyst | | “Cross-section lines do not intersect flow paths” | Poor digitizing | Edit lines in ArcMap. Use Intersect tool to snap endpoints. | | “DEM missing elevation values” | DEM has NoData cells | Fill sinks or use Spatial Analyst > Fill tool. | | “Export to HEC-RAS creates empty file” | No attributes set (e.g., RIVER, REACH) | Add and populate required fields in attribute table. | | “Water surface below ground” | Incorrect Manning’s n or DEM error | Review roughness coefficients; check DEM vertical datum. | hec georas for arcgis 10.8

Mapping: Import the results back into ArcMap for spatial analysis and reporting. Strategic Recommendations What is HEC-GeoRAS

• Select the centerline. Open the Attribute Table.
• Add a field: GRID_CODE (Short Integer) – set to 1 for the main river.
• Add a field: RIVER (Text) – name of the river.
• Add a field: REACH (Text) – name of the reach.

Resources

Technical Support: HEC does not provide technical support for GeoRAS to non-Corps users. For troubleshooting, refer to community forums like the Esri Community. Select the centerline

• RAS Mapper (built into HEC-RAS 5.0.7+): No GIS license needed, full 2D, and actively maintained.
• ArcGIS Pro + HEC-RAS Controller toolbox: USACE has a free “RAS Controller” for Pro (limited but growing).
• QGIS + GeoRAS plugin (Crayfish / QGIS-RAS): Open-source, no version hell.

• Add the HEC‑GeoRAS toolbox (.tbx) via Catalog or customize the toolbar under Customize > Toolbars.