U.S. Department of Agriculture, North Carolina Natural Resources Conservation Service State Office
06022008
Unknown
HydrologicUnits12Digit_NCOneMap
1
vector digital data
Raleigh, North Carolina
Natural Resources Conservation Service
NCCGIA distributes this dataset
withheld
HydrologicUnits12Digit_NCOneMap
**Uploaded to SDE on 11/18/10 by Malinda Ford.** This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level
for the State of North Carolina. This data set consists of geo-referenced digital data and associated attributes
created in accordance with the "FGDC Proposal, Version 2.0 - Federal Standards For Delineation of Hydrologic
Unit Boundaries 8/30/04"(http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/). Delineation of coastal
watershed boundaries presented unique issues within North Carolina. Coastal boundary lines were determined
using NOAA Nautical charts to supplement the USGS base maps. The paper "Proposal to Change Hydrologic Unit
Delineations over the Estaurine Waters of North Carolina", Randolph L. Ferguson, 3/30/2000, presents issues
and the delineation process used in the coastal regions of North Carolina.
Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level
subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow
modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a
metadata reference file.
The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of
subdividing large drainage areas. The smaller sized 6th level sub-watersheds (up to 40,000 acres) are useful for
numerous application programs supported by a variety of local, State, and Federal Agencies. This data set is intended
to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized
studies requiring a level of detail provided by large-scale map information. The dataset will be appended to a larger
seamless nationally consistant geospatial database as other states complete their portion of the watershed boundary
dataset.
en
20080602
Publication date of sources
Unknown
-85.178073
-75.309710
37.365506
33.136798
201152.598118
3073595.552368
-169960.504700
1316155.448587
None
HUC
Hydrologic Units
Hydrologic Unit Code
Region
Sub-region
Basin
Sub-basin
Watershed
Watershed Boundaries
boundaries
Subwatershed
WBD
Watershed Boundary Dataset
None
North Carolina
Neuse River
Cape Fear River
Yadkin River
French Broad River
Roanoke River
Albemarle Sound
Pamlico Sound
Carolinas
None
The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in the 2008 Watershed Boundary Dataset. The Natural Resources Conservation Service should be acknowledged as the data source in products derived from these data. The 2008 Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data from the source distributor.
Sherman Biggerstaff or North Carolina NRCS GIS Specialist
U.S. Department of Agriculture, North Carolina Natural Resources Conservation Service (NRCS) State Office
mailing address
4407 Bland Road, Suite 117
Raleigh
North Carolina
27609-6293
919/873-2132
sherman.biggerstaff@nc.usda.gov
Please mail or email questions and requests.
Funding for the North Carolina Watershed Boundary Dataset (WBD) was provided by the U.S. Department of
Agriculture-Natural Resources Conservation Service, North Carolina Department of Environment and Natural
Resources (NCDENR)-Division of Coastal Management, and the US Geological Survey. Representatives from the
NCDENR-Division of Coastal Management, NCDENR-Division of Land Resources-Geological Survey,
NCDENR-Division of Water Quality, NCDENR-Division of Water Resources, NCDENR-Division of Water
Resources-Groundwater Section, ITS-Center for Geographic Information and Analysis, US Geological Survey
(USGS), National Oceanic and Atmospheric Administration (NOAA), and US Fish and Wildlife Service contributed a
substantial amount of time and salary towards oversight and quality review of the dataset.
Special recognition goes to Randy Ferguson (NOAA), Ted Mew (NCDENR), Kathleen Farrell (NCDENR), Alan
Clark (NCDENR), and Silvia Terziotti (USGS) who contributed greatly of their time and expertise to guide
this project and develop the science necessary to produce this Watershed Boundary Dataset. Additionally,
a special thanks to Karen Hanson (USGS) and Sarah Walton (USGS) for all their hard work revising the WBD
and adding the final touches.
ESRI ArcCatalog 9.3.1.1850
Feature Class
There are no unclosed polygons, intersections without nodes, or polygons without labels or
with more than one label. Arc/Info's topological correction program CLEAN was used to
correct intersections without nodes, identify unclosed polygons and remove duplicate lines
with the same beginning and ending nodes. All sliver polygons were removed either using
eliminate, merge or manually in ArcEdit.
All fields for all polygons in the .pat are attributed. Some polygons in the Ncontrb_a field might
have a 0 value. All fields for the lines in the .aat are attributed. The lines adjacent to the
universal polygon are attributed with a 0 for the hu_level. These cannot be attributed until the
adjacent states complete their linework at which point the highest level of hydrologic unit can be
determined.
The WBD was revised in 2008 by the USGS using Enhanced USGS Digital Raster
Graphics (DRG-Es) county mosaic MrSID images as a base map for the land data. This revision process
brought all of the North Carolina WBD over-land boundary lines to be within a 12 meter buffer (+/- 40 feet)
of where visual interpretation put the actual boundary for the DRG-E map base. Previous WBD work by the NRCS
used either Enhanced Digital Raster Graphics (DRG-Es) images as source map for land data (work in 2002-2005)
or data manually digitized from paper USGS 7.5' quadrangle maps (early work in 1993-1994). The WBD for North
Carolina was started in 1993 using paper USGS quad maps and digitized into the NC Coordinate system, feet,
NAD27. Edits since then have used this Coordinate base, until 2008 when the USGS used the reprojected WBD
map in the North Carolina coordinate system, meters, and NAD83 for their revisions.
Maps in other coordinate systems were produced using the ArcInfo 9 project utility from this revised 2008
WBD base map. The WBD used NOAA Nautical Charts for over-water data, when the DRG-Es were not adequate.
Data completeness for DRG files reflect content of the source graphic and may therefore be reflected in
the completeness and accuracy of the WBD. The WBD map was digitized from USGS 1:24,000-scale digital raster
graphic base maps, with accuracy being stated for this scale. Accuracy and adequacy of the WBD at any other
scale shall be determined by the user. It should be noted that while general rules of hydrology were used
(i.e. water flows downhill), the location of boundaries is still somewhat subjective as the 1:24,000-scale
DRG-E do not always provide enough information for identifying the location of the boundaries. In these
instances group consensus was used. In the extremely flat areas (such as the Great Dismal Swamp) located in
the coastal plains of North Carolina, boundaries were adjusted for drainage effects and other surface flow
impediments such as highways which act like dikes. Please refer to the methods section for more details on
watershed delineation rules. Unquantifiable errors may be associated with coordinate shift (fuzzy tolerance
was set to 0.0001 meters, double precision), dangle (set to 15 meters). The default was used for all other
ArcEdit tolerances. As with the original DRGs, DRG-E is cast in the Universal Transverse Mercator
projection and is referenced to the NAD27 datum. When the DRG-Es are used in the NAD83 datum the alternate
world files only approximate the NAD83 by shifting the coordinates of the imagery. The total error introduced
using this shift is less than 2 meters for all DRG-E imagery.
U.S. Department of Agriculture-Natural Resources Conservation Service
2008
North Carolina Watershed Boundary Dataset
document, map
24000
CD-ROM or OnLine
2001
2008
map delineation
NRCS DRG
map delineation
Level 6 (12-digit) watersheds were delineated within a nested hierarchical structure using the existing
Level 5 (11-digit) watershed delineation as a starting framework. The level five 11-digit code
was reduced to 10 digits to conform to the new Federal Standards for the Delineation of Hydrologic
Units Boundaries, by dropping the digit in the last position.
06022008
Joined 8-digit HU attributes from USDA Geospatial Data Gateway (datagateway.nrcs.usda.gov) to
12-digit HU geometry to supply associated basin and sub-basin names.
20100922
NC Center for Geographic Information and Analysis
David Giordano
Physical
333 Six Forks Rd.
Raleigh
NC
27609
USA
919-754-6580
919-715-8551
david.giordano@nc.gov
8:30AM - 5:30PM
Phone and electronic mail preferred
Metadata imported.
withheld
20101118
09365400
Vector
Simple
FALSE
0
TRUE
FALSE
coordinate pair
0.000328
0.000328
survey feet
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983
NAD_1983_StatePlane_North_Carolina_FIPS_3200_Feet
Explicit elevation coordinate included with horizontal coordinates
1.000000
Study_Area
identifies watershed boundaries
n/a
Feature Class
0
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
Shape
Geometry
8
0
0
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
hu12_poly
polygons identify watershed boundaries
n/a
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
HUC_8
A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number was used in
every record that pertains to a subwatershed that resides within the same 8-digit sub-basin.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HUC_10
This field provides a unique 10-digit code for each watershed derived from the 8-digit code. This
same number was used in every record that pertains to a subwatershed that resides within the
same 10-digit watershed.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HUC_12
This field provides a unique 12-digit code for each subwatershed derived from the 10-digit code.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
ACRES
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
8
STATES
The "States" field includes the names of all state(s) that the subwatershed falls within.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
8
NCONTRB_A
Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_10_DS
The 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the
watershed that the 6th level HU falls within. Outlets created by ditching or other artificial
drainage were not considered for this field.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_10_NAME
A unique name for each 5th level hydrologic unit that relates to the major water feature within the polygon
or the major water body it contributes to
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_10_MOD
This field identifies interbasin transfers (IT), dams at outlet (DM), etc. that modify natural overland
flow as modifications are identified from most significant to least significant modification(s).
Hydrologic units with no modification are marked with NM.
Modification by U.S. Department of Agriculture, North Carolina Natural Resources Conservation
Service State Office to the Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_10_TYPE
This field identifies the type of watershed.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_12_DS
The 12-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the
watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage
were not considered for this field.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_12_NAME
A unique name for each 6th level hydrologic unit that relates to the major water feature within the
polygon or the major water body it contributes to
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_12_MOD
This field identifies interbasin transfers (IT), dams at outlet (DM), etc. that modify natural
overland flow as Modifications are identified from most significant to least significant modification(s).
Hydrologic units with no modification are marked with NM.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_12_TYPE
This field identifies the type of watershed.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_10_GNIS#
The Geographic Names Information System has a unique Feature ID number for
each officially recognized name in the country
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
HU_12_GNIS#
The Geographic Names Information System has a unique Feature ID number for
each officially recognized name in the country
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
SQ_MI
Area of subwatershed including non-contributing areas calculated to square
miles as a floating number with two decimal places.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Please refer to the Entity and Attribute Overview for valid values
Shape Length
Perimeter of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
Shape Area
Area of feature in internal units (feet2, meters2, etc).
ESRI
Positive real numbers that are automatically generated.
REGION
Name of HUC2 region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Names vary by region.
SUBREGION
Name of HUC4 region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Names vary by region.
BASIN
Name of HUC6 region (river basin name). Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Names vary by region.
SUBBASIN
Name of HUC8 region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Names vary by region.
HUC_2
Unique 2 digit code for region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Codes vary by region.
HUC_4
Unique 4 digit code for region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Codes vary by region.
HUC_6
Unique 6 digit code for region (river basin). Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Codes vary by region.
5
ACRES
Acreage of polygon. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Acreage varies by region.
5
SQ_MILES
Square miles of region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Square miles vary by region.
HU_8_STATE
State(s) in which polygon is present. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Values vary by region.
FIPS_C
County FIPS code intersecting region. Added from 8-digit HUC attribute join indicated in Process Step.
USDA/NRCS - National Cartography & Geospatial Center
Codes vary by region.
11
11
This is a description of attributes by field from the Federal Standards for Delineation of Hydrologic Unit Boundaries
1) Polygon attributes
Huc_8 : Eight Digit Hydrologic Unit Code - (REQUIRED)
A unique 8-digit code from the USGS map series "Hydrologic Unit Maps". The same number was used in every record that
pertains to a subwatershed that resides within the same 8-digit sub-basin. Numbers were assigned in an upstream to
downstream fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise
fashion.
Huc_10: Ten Digit Hydrologic Unit Code - (REQUIRED)
This field provides a unique 10-digit code for each watershed. This same number was used in every record that pertains
to a subwatershed that resides within the same 10-digit watershed. Numbers were assigned in an upstream to downstream
fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion.
Huc_12: Twelve Digit Hydrologic Unit Code - (REQUIRED)
This field provides a unique 12-digit code for each subwatershed. Numbers were assigned in an upstream to downstream
fashion. Where no downstream/upstream relationship could be determined numbers were assigned in a clockwise fashion.
Acres: Acres - (REQUIRED)
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals. The "Acres"
field was calculated from the "Area" field.
States: States - (REQUIRED)
The "States" field includes the names of all state(s) that the subwatershed falls within. The 2-digit postal abbreviation
in upper case and in alphabetical order was used, separated with a comma.
Ncontrb_a: Non-Contributing Area - (FIELD REQUIRED, ATTRIBUTES OPTIONAL)
Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing. If a
non-contributing area is on the boundary between two or more hydrologic units, the non-contributing area is associated
with the hydrologic unit adjacent to the low point on the boundary. This attribute should be the total of the
non-contributing areas within a hydrologic unit calculated in acres.
Hu_10_ds: Fifth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL)
This field has the 10-digit code of the 5th level hydrologic unit that is receiving the majority of the flow from the
watershed that the 6th level HU falls within. Outlets created by ditching or other artificial drainage were not
considered for this field. If an HU flows into an ocean or the Gulf of Mexico, this field was populated with "OCEAN"
and if a HU flows into one of the Great Lakes the term "LAKE" was used. If a HU flows across international borders,
"CANADA" or "MEXICO" was used depending on which country the HU drains into. If an HU is a closed basin, then the
term "CLOSED BASIN"was used.
Hu_10_name: Fifth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL)
This field used officially recognized names only. This field was populated by following the directions in subsection 6.3
"Watershed and Subwatershed Naming Protocol". The name used to attribute the watershed was used only once within a
4th level unit.
Hu_10_mod: Fifth Level Hydrologic Unit Modifications - (REQUIRED)
This field identifies any type of modifications to natural overland flow that alters the location of the hydrologic
unit boundary for a 10-digit watershed. This field shows the most significant to least significant modification(s)
to the watershed boundary. One or more of the following abbreviations was used.
SC - Stormwater Canal or Drainage Canal
ID - Irrigation Ditch
IT - Interbasin Transfer
BC - Barge Canal or Navigation Canal
SD - Stormwater Ditch
PD - Pipe Diversion
CD - Channel Diversion
NC - Noncontributing Area
KA - Karst
LE - Levee
NM - No Modifications
OC - Overflow Channel or Flume
DM - Dam at outlet or HU boundary
GC - General Canal/Ditch
PS - Pumping Station
DD - Drainage Ditch
SI - Siphon
AD - Aqueduct
RS - Reservoir
TF - Transportation Feature (road, railroad, docks etc.)
GF - Ground-Water Flow
MA - Mining Activity
UA - Urban Area
GL - Glacier
IF - Ice Field
OF - Overbank Flow
OT - Other
Hu_10_type: Fifth Level Hydrologic Unit Type - (REQUIRED)
This field was populated with the hydrologic unit type from the list provided that most closely identifies the watershed.
S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing
areas. This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic
units are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units.
C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is
internal, no overland flow leaves the hydrologic unit through the outlet point.
F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet.
These HU's are predominantly land with some water areas at or near the outlet(s).
M - "Multiple outlet" hydrologic unit - A watershed that has more than one natural outlet.
W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake,
easturies, harbors.
I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the
shore face.
U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that
have been listed.
Hu_12_ds: Sixth Level Downstream Hydrologic Unit Code - (FIELD REQUIRED, ATTRIBUTES OPTIONAL)
This field was populated with the 12-digit code of the 6th level hydrologic unit that is receiving the majority of the flow
from the subwatershed. Outlets created by ditching or other artificial drainage were not considered for this field.
If a HU flows into an ocean or the Gulf of Mexico it was populate with "OCEAN" and if a HU flows into one of the Great
Lakes the term "LAKE" was used. If a HU flows across international borders, "CANADA" or "MEXICO" was used depending
on which country the HU drains into. If an HU is a closed basin, this field was populated with the term "CLOSED BASIN".
Hu_12_name: Sixth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL)
Officially recognized names were used in this field. This field was populated by following the directions in subsection 6.3
"Watershed and Subwatershed Naming Protocol". The name used to attribute the subwatershed was used only once within a
4th level unit.
Hu_12_mod: Sixth Level Hydrologic Unit Modifications - (REQUIRED)
This field identifies any type of man-made modification(s) to natural overland flow that alters the location of the hydrologic
unit boundary for a 12-digit subwatershed. One or more of the following abbreviations was chosen for this field.
SC - Stormwater Canal or Drainage Canal
ID - Irrigation Ditch
IT - Interbasin Transfer
BC - Barge Canal or Navigation Canal
SD - Stormwater Ditch
PD - Pipe Diversion
CD - Channel Diversion
NC - Noncontributing Area
KA - Karst
LE - Levee
NM - No Modifications
OC - Overflow Channel or Flume
DM - Dam at outlet or HU boundary
GC - General Canal/Ditch
PS - Pumping Station
DD - Drainage Ditch
SI - Siphon
AD - Aqueduct
RS - Reservoir
TF - Transportation Feature (road, railroad, docks etc.)
GF - Ground-Water Flow
MA - Mining Activity
UA - Urban Area
GL - Glacier
IF - Ice Field
OF - Overbank Flow
OT - Other
Hu_12_type: Sixth Level Hydrologic Unit Type - (REQUIRED)
This field was populated with the hydrologic unit type from the list provided that most closely identifies the subwatershed.
S - "Standard" hydrologic unit - Any land HU with drainage flowing to a single outlet point, excluding non-contributing areas.
This includes areas or small triangular wedges between adjacent HU's that remain after classic hydrologic units
are delineated. Some examples include "true", "classic", "composite", and "remnant" hydrologic units.
C - "Closed Basin" hydrologic unit - A drainage area that is 100% non-contributing. This means all surface flow is
internal, no overland flow leaves the hydrologic unit through the outlet point.
F - "Frontal" hydrologic unit - Areas along the coastline of lakes, oceans, bays, etc. that have more than one outlet.
These HU's are predominantly land with some water at or near the outlet(s).
M - "Multiple outlet" hydrologic unit - A watershed that has more than one natural outlet.
W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake,
easturies.
I - "Island" hydrologic unit - A hydrologic unit that is one or more islands and adjacent water out to the toe of the
shore face.
U - "Unclassified" hydrologic unit - A hydrologic unit that can't be defined or doesn't fit into one of the types that have been listed.
2) Line attributes
Hu_level: Hydrologic Unit Level - (REQUIRED)
This field provides the means to create cartographically pleasing maps. This field is populated with the highest
hydrologic unit level (smallest number) for the line (arc) represented by the record. The attribute was recorded using
numbers 1 through 6 representing each level with 1 being the highest and 6 the lowest level. An example would be if a
line represents a region, subregion, basin, subbasin, watershed, and subwatershed boundary, then this cell was populated
with a 1 (Region). Below is a list of numbers used for each level.
Level Digit# Name
0 State Boundary
1 2 Region
2 4 Subregion
3 6 Basin
4 8 Subbasin
5 10 Watershed
6 12 Subwatershed
Linesource: Line Spatial Data Source - (REQUIRED)
The Linesource indicates the base map source(s) used to delineate at 1:24,000 scale. The field was populated using one
of the standardized code(s) listed below. If more than one code was used, then a comma was used to separate the codes.
TOPO24 - Delineation from hardcopy 1:24,000 scale topographic maps
TOPO25 - Delineation from hardcopy 1:25,000 topgraphic maps, only Alaska and Caribbean
TOPO63 - Delineation from hardcopy 1:63,360 topographic maps, only Alaska and Caribbean
DRG24 - Delineation from 1:24,000 scale Digital Raster Graphics
DRG25 - Delineation from 1:25,000 Digital Raster Graphics, only Alaska and Caribbean
DRG63 - Delineation from 1:63,360 Digital Raster Graphics, only Alaska and Caribbean
TN_HUC_MAP - Shared NC-TN hydrologic unit boundary lines with origin in the Tennessee WBD map during the 2002-2005 time period.
DEM10 - Derived from 10 meter Digital Elevation Model
DEM30 - Derived from 30 meter Digital Elevation Model
NED30 - Derived from 30 meter National Elevation Dateset Model
EDNA30 - (formally NED-H), derived from 30 meter Elevation Derivatives for National
Applications
BATH"scale" (ex. BATH24) - Interpreted from NOAA 1:24,000 scale bathymetric data
HYPSO"scale" (ex. HYPSO24)- Delineated from 1:24,000 scale contour data
ORTHO"scale" (ex. ORTHO12) - Interpreted from 1:12,000 scale Ortho-imagery
DEDEM10 - Drainage enforced 10 meter Digital Elevation Model
DEDEM30 - Drainage enforced 30 meter Digital Elevation Model
GPS - Derived from Global Positioning System
LIDAR - Derived from LIDAR
IFSAR - Derived from IFSAR data
OTH - Other
UNK - Unknown
NOAA Nautical Chart - Nautical charts showing water depth for open water HU boundaries
All other reference and source maps not listed should be noted in the metadata.
Meta_id: Metadata ID Number - (REQUIRED)
The Metadata ID is a code that identifies which metadata file applies to the arc. In most cases there is only one metadata file.
However, in some cases more than one metadata file was used to identify different groups and/or procedures used to
produce the lines. The metadata ID is a 4-character code starting with the 2-letter state postal code, followed by a
2-digit sequence number. For example "OK01", "ID02", etc
Federal Standard for Delineation of Hydrologic Unit Boundaries
North Carolina Center for Geographic Information and Analysis (CGIA)
CGIA Data Distribution
CGIA Data Distribution
Physical
333 Six Forks Rd.
Raleigh
North Carolina
27609
USA
(919) 754-6580
dataq@ncmail.net
8:30AM - 5:30PM
Electronic mail requests preferred
North Carolina Hydrologic Unit Boundaries Map
The NC Natural Resources Conservation Service (NC NRCS) has appointed the NC Center for Geographic Information and Analysis
(NC CGIA) as the official distributor for this dataset. NC CGIA is charged with the development and maintenance of
NC OneMap, in cooperation with other mapping organizations, is committed to offering
its users accurate, useful, and current information about the state of NC. Although every effort has been made to ensure
the accuracy of information, errors and conditions originating from physical sources used to develop the corporate
database may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for
the appropriate use of the information with respect to possible errors, original map scale, collection methodology,
currency of data, and other conditions specific to certain data.
NC CGIA does not support secondary distribution of this data, without its current, compiant metadata record. The use of trade names or commercial products does not
constitute their endorsement by the NC NRCS, NC CGIA or North Carolina State Government. NC NRCS and NC CGIA shall not
be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses
described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor
and not indirectly through other sources which may have changed the data in some way. These data should not be used at
scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in the 2008
Watershed Boundary Dataset. The NC NRCS makes no claims for the data's suitability for other purposes.
The NC NRCS should be acknowledged as the data source in products derived from these data. The 2008 Watershed Boundary
Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based
on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory
bodies are not to reassign to the NC NRCS any authority for the decisions they make. The NC NRCS will not perform any
evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital
enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation
of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small
scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest
version of the data from the source distributor.
ESRI shapefile (*.shp)
39.271
39.271
withheld
None. Download from www.nconemap.com is free of charge.
Data can be customized on a cost-recovery basis. Contact dataq@its.nc.gov
or 919-754-6580 for more information.
All formats available from www.nconemap.com are in ESRI shapefile.
Other formats are available on a cost-recovery basis - contact
dataq@ncmail.net or 919-754-6580 for more information. Format
compatibility is the user's responsibility.
20080602
Present
20101118
Sherman Biggerstaff or North Carolina NRCS GIS Specialist
North Carolina Natural Resources Conservation Service State Office
mailing address
4407 Bland Road, Suite 117
Raleigh
North Carolina
27609-6293
USA
919\873-2132 or 919\873-2119
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
This metadata file is to accompany the dataset. NCCGIA does not
support secondary distribution of this dataset without its current,
compliant metadata record. If the dataset described in this metadata
record was received from anyone besides NCCGIA, this metadata and
the dataset it describes may contain discrepancies.
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