Welcome Subscribers and Viewers, In this video downloading and installation Arc Hydro tool in ArcGIS is clearly explained. Please check the important linking below:
1.Software Download link: http://downloads.esri.com/archydro/ar...
2.Arc Hydro Tool Documents: http://downloads.esri.com/archydro/ar...
3.Tutorial Data and Document: http://downloads.esri.com/archydro/ar...
Source: ESRI