20160825
12011200
1.0
North American Profile of ISO19115 2003
FALSE
HUC12
1690734.410749
1911360.642068
292318.104534
562883.067012
1
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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20250127
13143600
20250127
13143600
NAP
150000000
5000
Amanda N. Hasemeier
USDA - Natural Resources Conservation Service
717-237-2236
One Credit Union Pl. Ste 340
Harrisburg
Pennsylvania
17110-2993
US
amanda.hasemeier@pa.usda.gov
GIS Specialist
Braden Boydston
Blair County, PA
GIS Specialist
423 Allegheny St. Ste 011
Hollidaysburg
Pennsylvania
16648
bboydston@blairco.org
US
814-693-3000 Ext. 1066
Cheryl S. Johnson
USDA - Natural Resources Conservation Service
GIS Coordinator
One Credit Union Pl. Ste 340
Harrisburg
Pennsylvania
17110-2993
cheryl.johnson@pa.usda.gov
US
717-237-2237
ArcGIS Metadata
1.0
http://www.pa.usda.nrcs.gov/WBD -
Enterprise Geodatabase Feature Class
2008-01-01T00:00:00
1
U.S. Department of Agriculture, Natural Resources Conservaton Service
Harrisburg, PA; Fort Worth, TX
Pennsylvania Natural Resources Conservation Service, State Office; Harrisburg, PA
vector digital data, geodatabase
HUC12
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the Commonwealth of Pennsylvania. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 10/2004 "(http://www.ftw.nrcs.usda.gov/huc_data.html). 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.</SPAN></P></DIV></DIV></DIV>
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.
Basin
Sub-region
Watershed Boundary Dataset
HUC
Region
boundaries
Pennsylvania WBD
Watershed Boundaries
WBD
Pennsylvania Watershed Boundary Dataset
Subwatershed
Hydrologic Units
Sub-basin
Watershed
PA-WBD
Hydrologic Unit Code
Basin
Sub-region
Watershed Boundary Dataset
HUC
Region
boundaries
Pennsylvania WBD
Watershed Boundaries
WBD
Pennsylvania Watershed Boundary Dataset
Subwatershed
Hydrologic Units
Sub-basin
Watershed
PA-WBD
Hydrologic Unit Code
Publication date of sources
2008-02-25T00:00:00
Pennsylvania
PA
USA
Chesapeake Bay
Allegheny River
Allegheny Basin
Delaware River
Delaware Basin
Genesee River
Genesee Basin
Monongahela River
Monongahela Basin
Ohio River
Ohio Basin
Potomac River
Potomac Basin
Susquehanna River
Susquehanna Basin
Esri ArcGIS 13.3.0.52636
1
-78.754401
-77.954361
40.878277
40.131486
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>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 7. 5 should be acknowledged as the data source in products derived from these data. The 7 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.</SPAN></P></DIV></DIV>
100% of the attributes were visually verified using the 24K Digital Raster Graphics (DRG’s). The accuracy of this data is dependent on the level of detail of the source material and interpretation procedures for capturing that source.
100% of the attributes were visually verified using the 24K Digital Raster Graphics (DRG’s)
Created 08/25/2016 from data from USDA's Watershed Boundary Dataset and downloaded via the USDA Geospatial Data Gateway (https://gdg.sc.egov.usda.gov/).
24000
Coordinated effort between the United States Department of Agriculture-Natural Resources Conservation Service (USDA-NRCS), the United States Geological Survey (USGS), and the Environmental Protection Agency (EPA). The Watershed Boundary Dataset (WBD) was created from a variety of sources from each state and aggregated into a standard national layer for use in strategic planning and accountability. Watershed Boundary Dataset for Maryland Available URL: "http://datagateway.nrcs.usda.gov" [Accessed 07/01/2007]. Other Subbasin datasets shared with surrounding states as datasets were completed [Accessed through 2005, 2006, and 2007]
ERRI – Small Watersheds: Boundaries of 9,895 watersheds in Pennsylvania indicated in the Pennsylvania gazetteer of streams. These boundaries enclose catchment areas for named streams officially recognized by the Board on Geographic Names and other unofficially named streams that flow through named hollows. ERRI extracted, reprojected and edge-matched datasets for major watersheds produced by the Water Resources Division of the U.S. Geological Survey into this small watersheds coverage of the state of Pennsylvania.
24000
Small Watersheds
1997-01-01T00:00:00
http://www.pasda.psu.edu
U.S. Geological Survey
Hydrologic unit map delineation and digitized map.
24000
USGS 7.5 Minute Topographic Quadrangle Sheets for the Commonwealth of Pennsylvania
U.S. Geological Survey
U.S. Geological Survey
Hydrologic unit map delineation and digitized map.
24000
Digital Raster Graphics
http://datagateway.nrcs.usda.gov
U.S. Geological Survey
U.S. Geological Survey
U.S. Geological Survey
Reference for 8-digit watershed delineation.
25000
250K Hydrologic Unit Boundaries
U.S. Geological Survey
U.S. Geological Survey
GIS dataset used for reference in verifying watershed boundary delineation.
24000
National Hydrography Dataset
NHD
http://nhd.usgs.gov/data.html
U.S. Geological Survey
U.S. Geological Survey
U.S. Geological Survey
Metadata imported.
2008-03-03T00:00:00
Meta_ID: PA02
Process_Description: USGS, Water Science Center, Salt Lake City; Edits to Downstream coding.
2009-08-01T00:00:00
Meta_ID: PA03
Process_Description: USGS, Water Science Center, Salt Lake City
Name edits: Populate blank fields Correct spelling, ex. Srping to Spring, St. to Saint or visa versa depending on how GNIS has it, Cemetary to Cemetery Standardize use of “Frontal” Standardize use of “Headwaters, Outlet” Standardize use of “Upper, Middle, Lower” Cursory check that name is contained within the hydrologic unit Remove extraneous non-domain or non-GNIS names at, near, below, above, from, to, directional-northernmost, southern, easterly, etc. Incorrect spacings, ex. Oakcreek should be Oak Creek
Line MODS: Assign a ‘SL’ for any arc that uses a shoreline/coastline as the boundary Assign a ‘PL’ for any arc that outlines a playa by using a contour or elevation HU_Level:
Verify that the arc attributes for HU_Level are correct International boundaries need to be coded as ‘0’ Outer extent along open ocean coastals should be coded as ‘1’ Linesource:
Anywhere that the NOAA 3-nautical mile outer extent is used should have a linesource of ‘NOAA3NM’
2010-07-08T00:00:00
META_ID: PA04
Process_Description: Updates by USGS Water Science Center, Salt Lake City, Utah.
Edits to any of the following:
Line Mods, HU_Level, Linesource, DS codes and states.
2010-10-01T00:00:00
META_ID: PA05 Process_Description: The Line Mods, HU_Level, Linesource, DS codes and states were edited by USGS Water Science Center in Salt Lake City, Utah.
2011-10-01T00:00:00
META_ID: PA06
Process_Description: Edits to linework by in-state steward.
2011-12-01T00:00:00
There are no unclosed polygons, intersections without nodes, or polygons without labels or with more than one label.
ArcGIS ‘topology’ rules for polygons were used to identify and correct intersections without nodes, 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 ArcMap.
All fields for all polygons in the polygon feature dataset are attributed. Some polygons in the Ncontrb_a field might have a 0 value. Some polygons in the Hu_10_ds and Hu_12_ds may have a 0 value. All fields for the lines in the arcs feature dataset are attributed.
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 An area that has more than one natural outlet; for example, an outlet located on a stream with multiple channels. This does not include frontal or water hydrologic units, hydrologic units with artificial interbasin transfers, drainage outlets through karst or ground-water flow, or outlets that cross a stream with an island. This code should be used only in rare instances. W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, estuaries, 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 An area that has more than one natural outlet; for example, an outlet located on a stream with multiple channels. This does not include frontal or water hydrologic units, hydrologic units with artificial interbasin transfers, drainage outlets through karst or ground-water flow, or outlets that cross a stream with an island. This code should be used only in rare instances. W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, estuaries. 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 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 topographic 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 DEM10 - Derived from 10 meter Digital Elevation Model DEM30 - Derived from 30 meter Digital Elevation Model NED30 - Derived from 30 meter National Elevation Dataset 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 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
HUC12
Feature Class
0
Table containing attribute information associated with the data set.
Producer defined
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
SHAPE
SHAPE
Geometry
8
0
0
Feature geometry.
Esri
Coordinates defining the features.
TNMID
TNMID
String
40
0
0
TNMID (short for The National Map Identification) is a unique 40-character field that identifies each element in the database exclusively.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
TNMID is an automatically assigned code that stays with each element. When an element is updated or changed, TNMID links the element to the metadata record and documents the change. TNMID is also used to maintain relationship classes in the normalized data model. When an element is deleted or split, TNMID stays with the original element and is not used again. When an element is split, new permanent identifiers are assigned to the resultant parts. Example {5DD21DC6-3692-4197-889B-49E652AA43D0}
METASOURCE
METASOURCE
String
40
0
0
MetaSourceID is an unique identifier that links the element to the metadata tables.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
MetaSourceID is an unique identifier that links the element to the metadata tables. This ID is generated and assigned automatically by the database and remains with the object permanently. For Example: 5DD21DC6-3692-4197-889B-49E652AA43D0
SOURCEDATA
SOURCEDATA
String
100
0
0
SourceData is a space provided for a brief description of the type of base data used to update or change the current WBD.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
The WBD In-State Steward completes this field as part of the metadata form. Example: Montgomery County 1-meter LiDAR
SOURCEORIG
SOURCEORIG
String
130
0
0
SOURCEORIG is the description of the agency that created the base data used to improve the WBD.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
The WBD In-State Steward completes this field as part of the metadata form For Example: USDA–FS LiDAR
SOURCEFEAT
SOURCEFEAT
String
40
0
0
SourceFeatureID is a long, unique code.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
This code identifies the parent of the feature if the feature is the result of a split or merge, and it is automatically generated and assigned. For Example: 5DD21DC6-3692-4197-889B-49E652AA43D0
LOADDATE
LOADDATE
Date
8
0
0
LoadDate represents the date when the data were loaded into the official USGS WBD ArcSDE database. The field is the effective date for all feature edits, and it is automatically generated.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
Value created automatically based on the current date.
GNIS_ID
GNIS_ID
Double
8
38
8
GNIS_ID is a preassigned numeric field that uses a unique number to relate the name of the hydrologic unit to the GNIS names database.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
Geographic Names Information System (GNIS)
GNIS (http://gnis.usgs.gov/)
AREAACRES
AREAACRES
Double
8
38
8
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.
Federal Standards for Delineation of Hydrologic Unit Boundaries
0
1000000000000
Acres
AREASQKM
AREASQKM
Double
8
38
8
The area of each hydrologic unit including non-contributing areas stored in square kilometers. AreaSqKm is calculated at the 12-digit hydrologic unit from the intrinsic area value maintained by the GIS software; therefore, the square kilometer values may vary from user calculations, depending on the projection of the data. North American Albers Equal Area Conic, North American Datum 1983 is the default projection.
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
0
10000000000000
Square Kilometers
STATES
STATES
String
50
0
0
The States or outlying area attribute identifies the State(s) or outlying areas that the hydrologic unit falls within or touches. Will be populated with the 2 character state abbreviation or outlying area attibute for each area that the unit falls within in alphabetical order. For Example: CO,UT,WY
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)
Section 6: Geospatial Data Structure and Attributes (http://pubs.usgs.gov/tm/11/a3/)
HUC12
HUC12
String
12
0
0
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.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for the Delineation of Hydrologic Unit Boundaries
Section 6: Coding and Naming (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
NAME
NAME
String
120
0
0
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.
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.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for Delineation of Hydrologic Unit Boundaries
Section 6: Coding and Naming (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
HUTYPE
HUTYPE
String
254
0
0
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 An area that has more than one natural outlet; for example, an outlet located on a stream with multiple channels. This does not include frontal or water hydrologic units, hydrologic units with artificial interbasin transfers, drainage outlets through karst or ground-water flow, or outlets that cross a stream with an island. This code should be used only in rare instances. W - "Water" hydrologic unit - Hydrologic units that are predominantly water with adjacent land areas, ex. lake, estuaries.
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.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for Delineation of Hydrologic Unit Boundaries
Section 7: Geospatial Data Structure (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
HUMOD
HUMOD
String
30
0
0
This field identifies interbasin transfers (IT), dams at outlet (DM), etc. that modify natural overland flow. Modifications are identified from most significant to least significant modification(s). Hydrologic units with no modification are marked with NM.
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
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for Delineation of Hydrologic Unit Boundaries
Section 7: Geospatial Data Structure (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
TOHUC
TOHUC
String
16
0
0
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".
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for Delineation of Hydrologic Unit Boundaries
Section 7: Geospatial Data Structure (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
NONCONTR_1
NONCONTR_1
Double
8
38
8
NONCONTRIB
NONCONTRIB
Double
8
38
8
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.
Federal Standards for Delineation of Hydrologic Unit Boundaries
Federal Standards for Delineation of Hydrologic Unit Boundaries
Section 7: Geospatial Data Structure (https://www.fgdc.gov/standards/projects/hydro-unit-boundaries/HU_standards_v2_fgdc.pdf)
SHAPE.STArea()
SHAPE.STArea()
Double
0
0
0
SHAPE.STLength()
SHAPE.STLength()
Double
0
0
0
dataset
EPSG
6.18.3(9.3.1.2)
0
Simple
FALSE
0
TRUE
FALSE
20250127