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12-Digit Hydrologic Units


Download Link: http://data.nconemap.gov/downloads/vector/hu.zip
Abstract: 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.
Purpose: 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.
Publication Date: 06022008
Originator: US Department of Agriculture, North Carolina Natural Resources Conservation Service State Office
Publisher: Natural Resources Conservation Service
Online Linkage: http://www.nconemap.gov
Time Period of Content:
Time Period Information:
Single Date/Time:
Calendar Date: 20080602
Currentness Reference: Publication date of sources
Status:
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -84.321747
East Bounding Coordinate: -75.389045
North Bounding Coordinate: 36.588109
South Bounding Coordinate: 33.593189
Contact Electronic Mail Address: sherman.biggerstaff@nc.usda.gov
Contact Voice Telephone: 919/873-2132
Grid Coordinate System Name: State Plane Coordinate System 1983
Horizontal Datum Name: North American Datum of 1983
Planar Distance Units: meters
Ellipsoid Name: Geodetic Reference System 1980
Attribute:
Attribute Label: META_ID
Attribute Definition: Metadata ID is a code that identifies which metadata file applies to the arc
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: OBJECTID
Attribute Definition: Internal feature number.
Attribute Definition Source: ESRI
Attribute Domain Values:
Unrepresentable Domain: Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute Label: Shape
Attribute Definition: Feature geometry.
Attribute Definition Source: ESRI
Attribute Domain Values:
Unrepresentable Domain: Coordinates defining the features.
Attribute:
Attribute Label: HUC_8
Attribute Definition: 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.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HUC_10
Attribute Definition: 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.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HUC_12
Attribute Definition: This field provides a unique 12-digit code for each subwatershed derived from the 10-digit code.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: ACRES
Attribute Definition: Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: STATES
Attribute Definition: The "States" field includes the names of all state(s) that the subwatershed falls within.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: NCONTRB_A
Attribute Definition: Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_10_DS
Attribute Definition: 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.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_10_NAME
Attribute Definition: 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
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_10_MOD
Attribute Definition: 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.
Attribute Definition Source: Modification by US Department of Agriculture, North Carolina Natural Resources Conservation Service State Office to the Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_10_TYPE
Attribute Definition: This field identifies the type of watershed.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_12_DS
Attribute Definition: 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.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_12_NAME
Attribute Definition: 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
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_12_MOD
Attribute Definition: 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.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_12_TYPE
Attribute Definition: This field identifies the type of watershed.
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_10_GNIS#
Attribute Definition: The Geographic Names Information System has a unique Feature ID number for each officially recognized name in the country
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: HU_12_GNIS#
Attribute Definition: The Geographic Names Information System has a unique Feature ID number for each officially recognized name in the country
Attribute Definition Source: Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values:
Codeset Domain:
Codeset Name: Federal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset Source: Please refer to the Entity and Attribute Overview for valid values
Attribute:
Attribute Label: Shape Length
Attribute Definition: Perimeter of feature in internal units.
Attribute Definition Source: ESRI
Attribute Domain Values:
Unrepresentable Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute Label: Shape Area
Attribute Definition: Area of feature in internal units (feet2, meters2, etc).
Attribute Definition Source: ESRI
Attribute Domain Values:
Unrepresentable Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute Label: REGION
Attribute Definition: Name of HUC2 region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Names vary by region.
Attribute:
Attribute Label: SUBREGION
Attribute Definition: Name of HUC4 region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Names vary by region.
Attribute:
Attribute Label: BASIN
Attribute Definition: Name of HUC6 region (river basin name). Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Names vary by region.
Attribute:
Attribute Label: SUBBASIN
Attribute Definition: Name of HUC8 region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Names vary by region.
Attribute:
Attribute Label: HUC_2
Attribute Definition: Unique 2 digit code for region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Codes vary by region.
Attribute:
Attribute Label: HUC_4
Attribute Definition: Unique 4 digit code for region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Codes vary by region.
Attribute:
Attribute Label: HUC_6
Attribute Definition: Unique 6 digit code for region (river basin). Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Codes vary by region.
Attribute:
Attribute Label: ACRES
Attribute Definition: Acreage of polygon. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Acreage varies by region.
Attribute:
Attribute Label: SQ_MILES
Attribute Definition: Square miles of region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Square miles vary by region.
Attribute:
Attribute Label: HU_8_STATE
Attribute Definition: State(s) in which polygon is present. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Values vary by region.
Attribute:
Attribute Label: FIPS_C
Attribute Definition: County FIPS code intersecting region. Added from 8-digit HUC attribute join indicated in Process Step.
Attribute Definition Source: USDA/NRCS - National Cartography & Geospatial Center
Attribute Domain Values:
Unrepresentable Domain: Codes vary by region.
Distribution Liability: NCCGIA is charged with the development and maintenance of NC OneMap and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop this dataset may be reflected in the data supplied. The user must be aware of possible 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. NCCGIA does not support secondary distribution of this dataset without its current, compliant metadata record. The use of trade names or commercial products does not constitute their endorsement by NCCGIA or North Carolina State Government.
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