GeoNet administrators have seen the need to restore at least some of the structure from the vBulletin (2010-2014) era forums.
Good to see that one of the first created is a sub-space in solutions for ArcHydro related discussions. The Space seems to be linked to the Group already.
Any new Hydro or ArcHydro related discussions should be opened there.
Existing threads have not been migrated, yet. I hope they will.