How to Download HEC‑GeoHMS for ArcGIS 10.8 (Exclusive Guide)
HEC‑GeoHMS is a widely used ArcGIS extension that preprocesses GIS data for HEC‑HMS hydrologic modeling. ArcGIS 10.8 uses the ArcMap/ArcGIS Desktop platform, so this guide focuses on obtaining and installing the correct HEC‑GeoHMS version compatible with ArcGIS 10.8.
Post-Installation Check
Open ArcMap:
Installation Steps
- Close ArcMap and ArcCatalog completely.
- Run
HEC-GeoHMS_1033_Setup.exe as Administrator.
- Accept the license agreement (Open Source – no restriction).
- Choose installation directory (default:
C:\Program Files (x86)\HEC\HEC-GeoHMS\)
- During setup, ensure the tool detects ArcGIS 10.8 installation. If not, check registry or reinstall ArcGIS.
- Complete installation → Restart computer.
Step 4 — Install HEC‑GeoHMS
- Unzip the downloaded package.
- Run the installer (right‑click → Run as administrator).
- Follow prompts; specify the ArcGIS installation folder if requested (usually C:\Program Files (x86)\ArcGIS\Desktop10.8).
- After installation, open ArcMap.
Issue 3: Menus are truncated or symbols missing
Adjust screen DPI scaling to 100% temporarily. Or set ArcMap.exe high DPI override.
Post‑install tips
- Install HEC‑HMS separately for simulation and to export model files created by HEC‑GeoHMS.
- Keep a backup of the downloaded installer for future reinstallation.
- Check HEC forums or the HEC website for patches or updates.
7. Troubleshooting Common Issues
- “Toolbox cannot be opened” – Re-register the extension via
regsvr32 HECGeoHMS.dll from the install folder.
- Spatial Analyst errors – Ensure the extension is licensed (Customize > Extensions > Spatial Analyst).
- Missing menus after Windows update – Re-run the installer as admin and choose “Repair”.