Arc Hydro Documentation
Arc Hydro versions available
|ArcGIS Version||Arc Hydro Version|
Use ArcGIS Pro 2.3.0. Earlier versions have issues with some of the Spatial Analyst tools.
You need to download the Buffering Degenerated Polygon Patch for ArcGIS 10.6.1:
Note: We are waiting for a hot fix/patch to resolve issues with some of the Spatial Analyst tools in 10.6.1 (expected in January).
You need to download the Stream Link patch for ArcGIS 10.4.1:
Esri Water Resources Team