AHED Subwatersheds

<div style='text-align:Left;'><div><div><p><span>SubWatersheds are the next level of drainage areas under Watersheds and smallest units classified in AHED (Arc Hydro Enhanced Database). They were formerly known at the District as Subbasins. Subwatersheds are the 12 Digit HUC (Hydrologic Unit Code) under USGS categorization of drainage areas. AHED does not populate HUC from NHD because there is not a one to one correspondence between the features.</span></p></div></div></div>