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

  1. Close ArcMap and ArcCatalog completely.
  2. Run HEC-GeoHMS_1033_Setup.exe as Administrator.
  3. Accept the license agreement (Open Source – no restriction).
  4. Choose installation directory (default: C:\Program Files (x86)\HEC\HEC-GeoHMS\)
  5. During setup, ensure the tool detects ArcGIS 10.8 installation. If not, check registry or reinstall ArcGIS.
  6. Complete installation → Restart computer.

Step 4 — Install HEC‑GeoHMS

  1. Unzip the downloaded package.
  2. Run the installer (right‑click → Run as administrator).
  3. Follow prompts; specify the ArcGIS installation folder if requested (usually C:\Program Files (x86)\ArcGIS\Desktop10.8).
  4. 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

7. Troubleshooting Common Issues

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