However, many legacy users still need to run it. This post reflects the last known working method for ArcGIS 10.8, but verify the links as USACE changes them frequently. Disclaimer: HEC-GeoHMS is officially retired. The USACE now recommends using HEC-HMS v4.5+ (which has built-in GIS tools) or the new HEC-HMS for QGIS. This guide is for legacy project maintenance only.
If you are trying to build a new hydrologic model, please use (which has a modern GIS interface) instead. VERIFIED-- Download Hec Geohms For Arcgis 10.8