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

: Some users have reported that certain "characteristic" tools (like river slope or basin length) can be buggy in the 10.8 environment. If you run into persistent issues, consider using the built-in GIS capabilities in the latest version of , which no longer requires a separate GIS extension. www.hec.usace.army.mil Looking for more? Check out the HEC-GeoHMS User Manual

Before installing, ensure your system meets these requirements: : Must be fully installed and licensed.