WBD_HU12: Twelve-Digit Hydrologic Unit

HU 12's have a 12-digit Hydrologic Unit Code and represent the 6th level of division of the WBD.

 


This graphic shows an example of HU-12 Boundaries. Each Hydrologic Unit  is labeled with its 12-digit HUC

Field Name

Definition

Comments

Gaz_ID

Unique identifier assigned by GNIS, length 10.

 

Area_Acres

 

 

Area_SqKm

 

 

States

 

 

LoadDate

 

 

HUC_12

Numeric identifier for each level (2,4,6,8,10, and 12) of hydrologic units

 

HU_12_Name

Name assigned to each level (2,4,6,8,10, and 12) of hydrologic units

 

HU_12_Type

Geomorphic and other considerations used to  develop the hydrologic unit.

 

See

ftp://ftp-fc.sc.egov.usda.gov/

NCGC/products/watershed/hu-standards.pdf

for domain of values

HU_12_Mod

A two-character, uppercase abbreviation(s) for either (1) the type of modification to natural overland flow that alters the location of a Watershed boundary or (2) the special conditions GF-ground-water flow, GL-glacier, IF-ice field, OF-overbank flow, KA-karst, NC-noncontributing area, and IT-interbasin transfer.

See

ftp://ftp-fc.sc.egov.usda.gov/

NCGC/products/watershed/hu-standards.pdf

for domain of values

NContrib_Acres

Area that does not flow toward the outlet of a hydrologic unit.

 

NContrib_SqKm

Area that does not flow toward the outlet of a hydrologic unit.

 

HU_2s are not included with the data

HU_14 and HU_16 are included only where created by local stewards.