As a follow-up note to the original question:
Many of the data models including Arc Hydro and Arc Hydro Groundwater have relationships in the geodatabase
thus it is sometimes problematic to edit data because in ArcView you cannot edit tables/feature classes that have
a relationship.
Fortunately, our tools are not based on relationships between the classes thus they work fine in ArcView.
To be more efficient in creating\managing geodatabase it is better to have ArcEditor\ArcInfo, but to run our tools
they will be fine with ArcView.