Note: Using Arc Hydro with ArcView
The Arc Hydro tools version 2.0 require ArcInfo/ArcEditor 10 with the Spatial Analyst extension.
Since ArcView allows only limited editing (simple features), not all functions are available with
ArcView. In particular, the following functions require ArcInfo/ArcEditor:
Hydro Network Generation
Calculate Length Downstream for Edges
Calculate Downstream for Junctions
Find Next Downstream Junctions
Store Flow Direction
Set Flow Direction
Drainage Boundary Definition