12-digit Hydrologic Unit 12
10-digit Hydrologic Unit 10
8-digit Hydrologic Unit 8
6-digit Hydrologic Unit 6
4-digit Hydrologic Unit 4
2-digit Hydrologic Unit 2
14-digit and 16-digit hydrologic units have a value of "14" and "16", respectively and are nested within the 12-digit hydrologic units. However, there are no 14-digit or 16-digit hydrologic units delineated for North Dakota at this time.
Second, some field names have changed slightly from what was on the ND GIS Hub previously to make them consistent with what is in the national WBD. The records contained in these attribute fields remain the same, just the field names have changed. MetasourceID, SourceDataDesc, SourceOriginator, and SourceFeatureID are the fields that now have the same name as the national dataset.
Lastly, linework and coding updates have been made in the following areas:
- HU12 hydrologic unit lines and codes have been added to the Canadian portion of the Lower Red basin.
- HUC12 linework adjustments have been made near selected confluences across the state to align WBD polygons to NHD streamlines, flowlines and pour points when appropriate.
- Revisions have been made throughout the dataset as part of a nationwide effort to review linework, verify HU codes, downstream codes as well as a comprehensive review of hydrologic unit names to bring older delineations up to the current standards.