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: It is highly recommended to install the corresponding version of Arc Hydro Tools for ArcGIS 10.8 first, as GeoHMS often relies on Arc Hydro's underlying data structures. Why Switch to Modern Tools?

: Although the U.S. Army Corps of Engineers (HEC) officially tested and verified versions only up to ArcGIS 10.2, they direct users to Esri for newer versions. download hec geohms for arcgis 108 exclusive

To successfully run HEC-GeoHMS on ArcGIS 10.8, ensure your system meets these requirements: : It is highly recommended to install the

If you are starting a new project, consider moving away from HEC-GeoHMS for the following reasons: Runoff estimation using HEC-Geo HMS and ArcGIS/ArcMap download hec geohms for arcgis 108 exclusive