12 Digit Hydrologic Unit 2006 (polygon)

SDE Feature Class

Tags
Hydrologic Unit Code, Region, Watershed Boundary Dataset, HUC, Watershed Boundaries, NRCS, Basin, water, drainage, USA, Hydrologic Units, Arkansas, Sub-basin, Watershed, WBD, drainages, Sub-region, Subwatershed, inlandWaters, HUC-12, boundaries


Summary

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 250,000 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 consistent geospatial database as other states complete their portion of the watershed boundary dataset.

Description

This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Arkansas. 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 3/01/02"(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, line source and a metadata reference file.

Credits

The dataset was created by the coordinated effort between multiple agencies including; Arkansas Natural Resources Commission (ANRC), USDA Arkansas, USDA Forest Service- Ozark-St. Francis National Forest, USGS Arkansas, USGS Utah, USGS Mississippi, Arkansas Game and Fish Commission, Arkansas Heritage Commission, Arkansas GIS User's Forum, Arkansas Department of Environmental Quality, Arkansas Geologic Commission, University of Arkansas at Monticello and University of Arkansas at Fayetteville. NRCS provided the oversight and did a major portion of the delineations and attribution in the eastern portion of the state and portions of the Upper White River area, as well as some areas along the middle and lower portions of the Arkansas side of the Mississippi. Over the past 1-1/2 years USGS in Arkansas as well as USGS in Utah have, under an agreement with NRCS and the State of Arkansas, completed the remainder of the states line work and attribution, appended the dataset together.

Use limitations

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 Arkansas. The NRCS should be acknowledged as the data source in products derived from these data. The Arkansas 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.

Extent

West  -94.618286    East  -89.616911
North  36.531908    South  32.969339

Scale Range
Maximum (zoomed in)  1:
Minimum (zoomed out)  1:250,000

ArcGIS Metadata 

Topics and Keywords 

Themes or categories of the resource  boundaries, inlandWaters


*Content type  Downloadable Data


Place keywords  USA, Arkansas

Theme keywords  inlandWaters

Thesaurus
Title ISO 19115 Topic Category




Theme keywords  Hydrologic Unit Code, Region, Watershed Boundary Dataset, HUC, Watershed Boundaries, Basin, Hydrologic Units, Sub-basin, Watershed, WBD, Sub-region, Subwatershed, boundaries

Thesaurus
Title Natural Resources Conservation Service




Theme keywords  NRCS, water, drainage, drainages, HUC-12

Thesaurus
Title Arkansas Geographic Information Office




Citation 

Title 12 Digit Hydrologic Unit 2006 (polygon)
Publication date 2005-01-01
Indeterminate time unknown


Edition 1


Presentation formats  digital map
FGDC geospatial presentation format  vector digital data


Citation Contacts 

Responsible party
Organization's name Arkansas Natural Resources Conservation Service State Office (NRCS)
Contact's role  originator


Responsible party
Organization's name U.S. Natural Resources Conservation Service
Contact's role  publisher


Contact information
Address
Delivery point Fort Worth, Texas



Resource Details 

Dataset languages  English (UNITED STATES)


Status  completed
Spatial representation type  vector


Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322


Credits
The dataset was created by the coordinated effort between multiple agencies including; Arkansas Natural Resources Commission (ANRC), USDA Arkansas, USDA Forest Service- Ozark-St. Francis National Forest, USGS Arkansas, USGS Utah, USGS Mississippi, Arkansas Game and Fish Commission, Arkansas Heritage Commission, Arkansas GIS User's Forum, Arkansas Department of Environmental Quality, Arkansas Geologic Commission, University of Arkansas at Monticello and University of Arkansas at Fayetteville. NRCS provided the oversight and did a major portion of the delineations and attribution in the eastern portion of the state and portions of the Upper White River area, as well as some areas along the middle and lower portions of the Arkansas side of the Mississippi. Over the past 1-1/2 years USGS in Arkansas as well as USGS in Utah have, under an agreement with NRCS and the State of Arkansas, completed the remainder of the states line work and attribution, appended the dataset together.

ArcGIS item properties
*Name asdi.WATER.WBD_HU12_NRCS_2006
*Location Server=170.94.248.50; Service=sde:sqlserver:170.94.248.50; Database=asdi; User=water; Version=dbo.DEFAULT
*Access protocol ArcSDE Connection

Extents 

Extent
Description
ground condition

Temporal extent
Beginning date
Indeterminate date unknown
Ending date
Indeterminate date unknown

Extent
Geographic extent
Bounding rectangle
West longitude -94.618286
East longitude -89.616911
South latitude 32.969339
North latitude 36.531908

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -94.618286
*East longitude -89.616911
*North latitude 36.531908
*South latitude 32.969339
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude 355107.351000
*East longitude 803088.088000
*South latitude 3652558.207000
*North latitude 4042947.500000
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Individual's name Pam Cooper
Organization's name Arkansas National Resource Conservation Service State Office
Contact's role  point of contact


Contact information
Phone
Voice (501) 301-3146

Address
Type postal
Delivery point 700 West Capitol Ave, Federal Office Building, Rm. 3416
City Little Rock
Administrative area Arkansas
Postal code 72201-3225
e-mail addressPam.Cooper@ar.usda.gov

Contact instructions
Please email questions and requests.



Resource Maintenance 

Resource maintenance
Update frequency  as needed


Resource Constraints 

Legal constraints
Limitations of use
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 Arkansas. U.S. Department of Agriculture makes no claims for the data's suitability for other purposes. U.S. Department of Agriculture should be acknowledged as the data source in products derived from these data. The Arkansas 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 U.S. Department of Agriculture or 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.

Security constraints
Classification  unclassified


Constraints
Limitations of use
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 Arkansas. The NRCS should be acknowledged as the data source in products derived from these data. The Arkansas 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.

Spatial Reference 

ArcGIS coordinate system
*Type Projected
*Geographic coordinate reference GCS_North_American_1983
*Projection NAD_1983_UTM_Zone_15N
*Coordinate reference details
Projected coordinate system
Well-known identifier 26915
X origin -5120900
Y origin -9998100
XY scale 8000
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 0.002
Z tolerance 0.001
M tolerance 0.001
High precision true
Latest well-known identifier 26915
Well-known text PROJCS["NAD_1983_UTM_Zone_15N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-93.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26915]]

Reference system identifier
*Value 26915
*Codespace EPSG
*Version 8.2.6


Spatial Data Properties 

Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name asdi.WATER.WBD_HU12_NRCS_2006
*Object type  composite
*Object count 1574



ArcGIS Feature Class Properties
Feature class name asdi.WATER.WBD_HU12_NRCS_2006
*Feature type Simple
*Geometry type Polygon
*Has topology FALSE
*Feature count 1574
*Spatial index TRUE
*Linear referencing FALSE



Data Quality 

Scope of quality information
Resource level  dataset




Data quality report - Topological consistency
Evaluation method
There are no unclosed polygons, intersections without nodes, or polygons without labels or with more than one label. Arc/Info's topological checking 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.





Data quality report - Conceptual consistency
Measure description
There are no unclosed polygons, intersections without nodes, or polygons without labels or with more than one label. Arc/Info's topological checking 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.





Data quality report - Completeness omission
Measure description
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.





Data quality report - Quantitative attribute accuracy
Measure description
100% of the attributes were visually verified using 24K digital raster graphics (DRG's). The accuracy of this data is dependent on the level of detail of the source material and the interpretation procedures for capturing that source.





Data quality report - Absolute external positional accuracy
Dimension horizontal


Measure description
The Arkansas WBD was produced using Digital Raster Graphics (DRG's) as the source map. Data completeness for DRG files reflects content of the source graphic and may therefore be reflected in the completeness and accuracy of the WBD. The map was digitized from USGS 1:24,000-scale digital raster graphic base maps, with an inherited error of +/- 40 feet according to the USGS National Map Accuracy Standards. It is estimated that any errors detected were less than 10%. It should also be noted that while general rules of hydrology were used (i.e. natural water flow is downhill), the locations of boundaries is still somewhat subjective as the 1:24,000-scale DRG's do not always provide enough information for identifying the location of the boundaries.





Data quality report - Absolute external positional accuracy
Dimension vertical


Measure description
N/A





Lineage 

Process step
When the process occurred 2003-01-01
Description
Proposals were developed, funding was secured, and interagency agreements were written and signed.



Source data
Relationship to the process step used


Source citation
Alternate titles  N/A








Process step
When the process occurred
Indeterminate date unknown
Description
This dataset was produced digitally on screen in Arcview or Arcmap referencing the Digital Raster Graphics for the method of delineation. As the dataset evolved, and especially in the northeastern portion of the state, the National Hydrography Dataset along with the Digital Ortho Quarter Quads (DOQQs) provided very useful as a reference for determining breaks in the flood plains. DOQQs were cited frequently along the Mississippi as well. Every effort has been made to create any new linework plus bring the historical linework within the National Standards for Spatial Data Accuracy (NSSDA) for 1:24,000 meter scale.



Source data
Relationship to the process step used


Source citation
Alternate titles  USGSDRG Source_Used_Citation_Abbrebiation: USGSDOQ








Process step
When the process occurred
Indeterminate date unknown
Description
Edge-matching with Oklahoma, Mississippi, Missouri, Tennessee and Texas has been completed. Louisiana has no linework along the Arkansas border at this time. Since the headwaters reside in Arkansas along that border, it should be reasonable for Louisiana to edge-match with Arkansas at the time they begin that work.



Source data
Relationship to the process step used


Source citation
Alternate titles  N/A








Process step
When the process occurred
Indeterminate date unknown
Description
General subwatershed boundaries were created using EDNA30. These general raster lines were used as reference lines for on-screen digitizing



Source data
Relationship to the process step used


Source citation
Alternate titles  EROS








Process step
When the process occurred
Indeterminate date unknown
Description
Upon completion of all linework, attribution was also completed to meet the Federal Standards for Delineation of Hydrologic Unit Boundaries.



Source data
Relationship to the process step used


Source citation
Alternate titles  N/A








Process step
When the process occurred 2005-01-01
Description
General subwatershed boundaries were created for Sub-basins 08020203 and 08020204 using the WBDTools



Source data
Relationship to the process step used


Source citation
Alternate titles  NED10








Process step
When the process occurred 2005-09-22
Description
First draft of metadata created by kjones using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set h:\wbd\edgematching_shapefiles\final\metadata\ar\ar_hu12_geo83





Source data
Description
GIS coverage used for reference in watershed boundary delineation



Source medium name  online link
Resolution of the source data
Scale denominator 24000

Source citation
Title National Hydrography Dataset
Alternate titles  NHD
Publication date
Indeterminate date unknown


Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator


Resource location online
Locationhttp://nhd.usgs.gov/data.html



Extent of the source data
Description
map delineation

Temporal extent
Date and time
Indeterminate date unknown



Source data
Description
hydrologic unit map delineation and digitize map



Source medium name  online link
Resolution of the source data
Scale denominator 24000

Source citation
Title Digital Raster Graphics
Alternate titles  USGSDRG
Publication date
Indeterminate date unknown


Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator


Resource location online
Locationhttp://datagateway.nrcs.usda.gov



Extent of the source data
Description
map delineation

Temporal extent
Date and time 1999-01-01



Source data
Description
Reference for 8-digit watershed delineation



Source medium name  online link
Resolution of the source data
Scale denominator 250000

Source citation
Title 250K Hydrologic Unit Boundaries
Alternate titles  USGS2
Publication date
Indeterminate date unknown


Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator




Extent of the source data
Description
ground condition

Temporal extent
Date and time
Indeterminate date unknown



Source data
Description
ARCView coverages for creation of raster lines



Source medium name  online link
Resolution of the source data
Scale denominator 0

Source citation
Title EDNA (EDNA30) Elevation Derivatives for National Applications-Stage 2 package
Alternate titles  EROS
Publication date
Indeterminate date unknown


Presentation formats  digital map
FGDC geospatial presentation format  raster digital data


Responsible party
Organization's name EROS Data Center
Contact's role  originator


Resource location online
Location <http://edc.usgs.gov>



Extent of the source data
Description
publication date

Temporal extent
Date and time
Indeterminate date unknown



Source data
Description
Creating raster lines using WBDTools



Source medium name  online link
Resolution of the source data
Scale denominator 0

Source citation
Title National Elevation Dataset
Alternate titles  NED10
Publication date
Indeterminate date unknown


Presentation formats  digital map
FGDC geospatial presentation format  raster digital data


Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator


Resource location online
Locationhttp://ned.usgs.gov/



Extent of the source data
Description
publication date

Temporal extent
Date and time
Indeterminate date unknown



Source data
Description
GIS raster coverage used for reference in watershed boundary delineation



Source medium name  online link
Resolution of the source data
Scale denominator 24000

Source citation
Title Digital Orthophoto Quads
Alternate titles  USGSDOQ
Publication date
Indeterminate date unknown


Presentation formats  digital map
FGDC geospatial presentation format  raster digital data


Responsible party
Organization's name U.S. Geological Survey
Contact's role  originator


Resource location online
Locationhttp://datagateway.nrcs.usda.gov



Extent of the source data
Description
publication date

Temporal extent
Date and time
Indeterminate date unknown



Distribution 

Distributor
Contact information
Individual's name Arkansas Geographic Information Systems Office
Organization's name State of Arkansas
Contact's role  distributor


Contact information
Phone
Voice 501-682-2676
Fax 501-682-6077

Address
Type both
Delivery point 1 Capitol Mall Suite 6D
City Little Rock
Administrative area AR
Postal code 72201
e-mail addresscommunication@arkansasgisoffice.org





Distributor
Contact information
Individual's name Arkansas GIS Office
Organization's name State of Arkansas
Contact's role  distributor


Contact information
Phone
Voice 501-682-2929

Address
Type physical
Delivery point 1 Capitol Mall, Suite 6D
City Little Rock
Administrative area AR
Postal code 72212
Country US
e-mail addresscommunication@arkansasgisoffice.org



Ordering process

Transfer options
Online source
Locationhttp://gis.arkansas.gov/

Online source
Location https://gis.arkansas.gov/arcgis/rest/services/FEATURESERVICES/Water/FeatureServer/23



Distribution format
*Name SDE Feature Class


Transfer options
Online source
Locationhttp://gis.arkansas.gov

Fields 

Details for object asdi.WATER.WBD_HU12_NRCS_2006 
*Type Feature Class
*Row count 1574
Definition
identifies watershed boundaries

Definition source
n/a



Field E00_CENTROID_X
 
*Alias E00_CENTROID_X
*Data type Double
*Width 8
*Precision 38
*Scale 8
Field description
Feature geometry.

Description source
ESRI

Description of values
Coordinates defining the features.





Field HU_10_GNIS_
 
*Alias HU_10_GNIS_
*Data type String
*Width 23
*Precision 0
*Scale 0
Field description
This field identifies the Geogrphic Names Information System (GNIS) unique Feature Identification Number that was used for the creation of the HU_10_NAME.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_12_TYPE
 
*Alias HU_12_TYPE
*Data type String
*Width 1
*Precision 0
*Scale 0
Field description
This field identifies the type of watershed.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_12_DS
 
*Alias HU_12_DS
*Data type String
*Width 12
*Precision 0
*Scale 0
Field description
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.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_10_TYPE
 
*Alias HU_10_TYPE
*Data type String
*Width 1
*Precision 0
*Scale 0
Field description
This field identifies the type of watershed.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_10_NAME
 
*Alias HU_10_NAME
*Data type String
*Width 80
*Precision 0
*Scale 0
Field description
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

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field SE_ANNO_CAD_DATA
 
*Alias SE_ANNO_CAD_DATA
*Data type Blob
*Width 0
*Precision 0
*Scale 0




Field AR_HU12_UTM15_
 
*Alias AR_HU12_UTM15_
*Data type Integer
*Width 4
*Precision 10
*Scale 0
Field description
Internal feature number.

Description source
ESRI

Description of values
Sequential unique whole numbers that are automatically generated.





Field NCONTRB_A
 
*Alias NCONTRB_A
*Data type Double
*Width 8
*Precision 38
*Scale 8
Field description
Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field Shape
 
*Alias HU_12_MOD
*Data type String
*Width 20
*Precision 0
*Scale 0
Field description
Feature geometry.

Description source
ESRI

Description of values
Coordinates defining the features.





Field HU_12_MOD
 
*Alias HU_12_GNIS_
*Data type String
*Width 23
*Precision 0
*Scale 0
Field description
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 AR.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_12_GNIS_
 
*Alias SHAPE
*Data type Geometry
*Width 4
*Precision 0
*Scale 0
Field description
This field identifies the Geogrphic Names Information System (GNIS) unique Feature Identification Number that was used for the creation of the HU_12_NAME.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values

*Description of values
Coordinates defining the features.





Field SHAPE
 
*Alias E00_CENTROID_Y
*Data type Double
*Width 8
*Precision 38
*Scale 8
Field description
Feature geometry.

Description source
ESRI

Description of values
Coordinates defining the features.





Field E00_CENTROID_Y
 
*Alias PERIMETER_M
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field PERIMETER_M
 
*Alias AREA_M
*Data type Double
*Width 8
*Precision 38
*Scale 8
Field description
Perimeter of feature in internal meters.

Description source
ESRI

Description of values
Positive real numbers that are automatically generated.





Field AREA_M
 
*Alias HU_10_DS
*Data type String
*Width 10
*Precision 0
*Scale 0
Field description
Area of feature in internal meters squared.

Description source
ESRI

Description of values
Positive real numbers that are automatically generated.





Field HU_10_DS
 
*Alias STATES
*Data type String
*Width 11
*Precision 0
*Scale 0
Field description
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.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field STATES
 
*Alias HUC_12
*Data type String
*Width 12
*Precision 0
*Scale 0
Field description
The "States" field includes the names of all state(s) that the subwatershed falls within.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HUC_12
 
*Alias HUC_10
*Data type String
*Width 10
*Precision 0
*Scale 0
Field description
This field provides a unique 12-digit code for each subwatershed derived from the 10-digit code.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HUC_10
 
*Alias ACRES
*Data type Double
*Width 8
*Precision 38
*Scale 8
Field description
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.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field ACRES
 
*Alias HUC_8
*Data type String
*Width 8
*Precision 0
*Scale 0
Field description
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HUC_8
 
*Alias AR_HU12_UTM15_ID
*Data type Integer
*Width 4
*Precision 10
*Scale 0
Field description
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.

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field AR_HU12_UTM15_ID
 
*Alias OBJECTID
*Data type OID
*Width 4
*Precision 10
*Scale 0
Field description
User-defined feature number.

Description source
ESRI

Description of values
Sequential unique whole numbers that are automatically generated.





Field OBJECTID
 
*Alias HU_10_MOD
*Data type String
*Width 20
*Precision 0
*Scale 0
Field description
Internal feature number.

Description source
ESRI

Description of values
Sequential unique whole numbers that are automatically generated.





Field HU_10_MOD
 
*Alias shape.STLength()
*Data type Double
*Width 0
*Precision 0
*Scale 0
Field description
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 AR.

Description source
Modification by Arkansas Natural Resources Conservation Service to the Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values



Field HU_12_NAME
 
*Alias shape.STArea()
*Data type Double
*Width 0
*Precision 0
*Scale 0
Field description
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

Description source
Federal Standards for Delineation of Hydrologic Unit Boundaries

Coded values
Name of codelist Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source Please refer to the Entity and Attribute Overview for valid values

*Description of values
Sequential unique whole numbers that are automatically generated.





Field shape.STLength()
 
*Alias HU_12_NAME
*Data type String
*Width 80
*Precision 0
*Scale 0






Overview Description
Entity and Attribute Overview
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 ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary GC - General Canal PS - Pumping Station DD - Drainage Ditch AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground Water Flow MA - Mining Activity UA - Urban Area OT - Other Hu_10_type: Fifth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the watershed. Use any of the one-digit abbreviations in uppercase that is provided in the list. 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). 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) Populate this field 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 are not to be considered for this field. If a HU flows into an ocean or the Gulf of Mexico populate this field with "OCEAN" and if a HU flows into one of the Great Lakes use the term "LAKE". If a HU flows across international borders use "CANADA" or "MEXICO" depending on which country the HU drains into. If an HU is a closed basin, then populate this record with the term "CLOSED BASIN". Hu_12_name: Sixth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) This field is for officially recognized names only. Populate this field by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". The name used to attribute the subwatershed should be used only once within a 6th level unit. Some 10-digit HU were assigned the huc_12 number when no GNIS name was identified on the DRG-Es. Hu_12_mod: Sixth Level Hydrologic Unit Modifications - (REQUIRED) This field should identify any type of modifications to natural overland flow that alters the location of the hydrologic unit boundary for a 12-digit subwatershed. In the attribute field, identify from most significant to least significant modification(s). Use one or more of the following abbreviations in uppercase to identify your modification(s). If using more than one abbreviation, separate with a comma with no space after the comma. SC - Stormwater Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary GC - General Canal PS - Pumping Station DD - Drainage Ditch AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground Water Flow MA - Mining Activity UA - Urban Area OT - Other Hu_12_type: Sixth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the subwatershed. Use any of the one digit abbreviations in uppercase that is provided in the list. 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). 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. HU_10_GNIS#: 5th level GNIS Feature Identification Number - (Field Required, Attribute Optional) The Geographic Names Information System (GNIS) has a unique Feature Identification Number for each officially recognized name in the country. This number is 6-7 characters long. If a hydrologic unit name uses two or mure features, then this field would have two GNIS feature numbers with a space separating each number. As of August, 2004 this field does not need to be populated, but plans are to developed a semi_automated method to do this. HU_12_GNIS#: 6th level GNIS Feature Identification Number - (Field Required, Attribute Optional) The Geographic Names Information System (GNIS) has a unique Feature Identification Number for each officially recognized name in the country. This number is 6-7 characters long. If a hydrologic unit name uses two or more features, then this field would have two GNIS feature numbers with a space separating each number. As of August, 2004 this field does not need to be populated, but plans are to developed a semi_automated method to do this. ArcInfo (.pat) and ArcView Polygon Format Item name Width Output Type (ArcView) N.Dec. Example Huc_8 8 8 C - 01080201 Huc_10 10 10 C - 0108020103 Huc_12 12 12 C - 010802010310 Acres 8 12 F N 0 026739 States 11 11 C - KS,MO,OK Ncontrb_a 8 12 F N 0 357 Hu_10_ds 10 10 C - 1710020504 Hu_10_name 80 80 C - Upper Blue River Hu_10_mod 20 20 C - CB,NC,ID Hu_10_type 1 1 C - S Hu_12_ds 12 12 C - 171002050402 Hu_12_name 80 80 C - Drift Creek-Big Bear River Hu_12_mod 20 20 C - SD,KA,PD Hu_12_type 1 1 C - C HU_10_GNIS# 23 23 C - 102354 238437 HU_12_GNIS# 23 23 C - 1023547 2384378



Entity and Attribute Detail Citation
Federal Standard for Delineation of Hydrologic Unit Boundaries





Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


Last update 2017-01-12


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Standard or profile used to edit metadata ISO19139


Created in ArcGIS for the item 2010-06-03 10:13:17
Last modified in ArcGIS for the item 2017-07-20 10:00:04


Automatic updates
Have been performed Yes
Last update 2017-07-20 10:00:04

Published to an ArcIMS Metadata Service Published



Metadata Contacts 

Metadata contact
Individual's name Karen Hanson
Organization's name U.S Geological Survey
Contact's role  point of contact


Contact information
Phone
Voice 801-908-5038
Fax 801-908-5000

Address
Type postal
Delivery point 2329 Orton Circle
City West Valley
Administrative area UT
Postal code 84119
Country US
e-mail addresskhanson@usgs.gov



Metadata Constraints 

Security constraints
Classification  unclassified


Thumbnail and Enclosures 

Thumbnail

Enclosure
Enclosure type  File
Description of enclosure original metadata
Original metadata document, which was translated yes
Source metadata format fgdc

FGDC Metadata (read-only) 

Entities and Attributes 

Detailed Description
Entity Type
Entity Type Labelasdi.water.BASINS_HUC12_NRCS_2006
Entity Type Definition
identifies watershed boundaries
Entity Type Definition Sourcen/a

Attribute
Attribute LabelE00_CENTROID_X
Attribute Definition
Feature geometry.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Coordinates defining the features.

Attribute
Attribute LabelHU_10_GNIS_
Attribute Definition
This field identifies the Geogrphic Names Information System (GNIS) unique Feature Identification Number that was used for the creation of the HU_10_NAME.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_12_TYPE
Attribute Definition
This field identifies the type of watershed.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_10_TYPE
Attribute Definition
This field identifies the type of watershed.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelSE_ANNO_CAD_DATA

Attribute
Attribute LabelAR_HU12_UTM15_
Attribute Definition
Internal feature number.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute LabelNCONTRB_A
Attribute Definition
Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelShape
Attribute Definition
Feature geometry.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Coordinates defining the features.

Attribute
Attribute LabelHU_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 AR.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_12_GNIS_
Attribute Definition
This field identifies the Geogrphic Names Information System (GNIS) unique Feature Identification Number that was used for the creation of the HU_12_NAME.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values
Unrepresentable Domain
Coordinates defining the features.

Attribute
Attribute LabelSHAPE
Attribute Definition
Feature geometry.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Coordinates defining the features.

Attribute
Attribute LabelE00_CENTROID_Y

Attribute
Attribute LabelPERIMETER_M
Attribute Definition
Perimeter of feature in internal meters.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Positive real numbers that are automatically generated.

Attribute
Attribute LabelAREA_M
Attribute Definition
Area of feature in internal meters squared.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Positive real numbers that are automatically generated.

Attribute
Attribute LabelHU_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelSTATES
Attribute Definition
The "States" field includes the names of all state(s) that the subwatershed falls within.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHUC_12
Attribute Definition
This field provides a unique 12-digit code for each subwatershed derived from the 10-digit code.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHUC_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelACRES
Attribute Definition
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.
Attribute Definition SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHUC_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelAR_HU12_UTM15_ID
Attribute Definition
User-defined feature number.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute LabelOBJECTID
Attribute Definition
Internal feature number.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute LabelHU_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 AR.
Attribute Definition SourceModification by Arkansas Natural Resources Conservation Service to the Federal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values

Attribute
Attribute LabelHU_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 SourceFederal Standards for Delineation of Hydrologic Unit Boundaries
Attribute Domain Values
Codeset Domain
Codeset NameFederal Standards for the Delineation of Hydrologic Unit Boundaries
Codeset SourcePlease refer to the Entity and Attribute Overview for valid values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute Labelshape.STLength()

Overview Description
Entity and Attribute Overview
                            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 ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary GC - General Canal PS - Pumping Station DD - Drainage Ditch AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground Water Flow MA - Mining Activity UA - Urban Area OT - Other Hu_10_type: Fifth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the watershed. Use any of the one-digit abbreviations in uppercase that is provided in the list. 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). 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) Populate this field 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 are not to be considered for this field. If a HU flows into an ocean or the Gulf of Mexico populate this field with "OCEAN" and if a HU flows into one of the Great Lakes use the term "LAKE". If a HU flows across international borders use "CANADA" or "MEXICO" depending on which country the HU drains into. If an HU is a closed basin, then populate this record with the term "CLOSED BASIN". Hu_12_name: Sixth Level Hydrologic Unit Name - (FIELD REQUIRED, ATTRIBUTES OPTIONAL) This field is for officially recognized names only. Populate this field by following the directions in subsection 6.3 "Watershed and Subwatershed Naming Protocol". The name used to attribute the subwatershed should be used only once within a 6th level unit. Some 10-digit HU were assigned the huc_12 number when no GNIS name was identified on the DRG-Es. Hu_12_mod: Sixth Level Hydrologic Unit Modifications - (REQUIRED) This field should identify any type of modifications to natural overland flow that alters the location of the hydrologic unit boundary for a 12-digit subwatershed. In the attribute field, identify from most significant to least significant modification(s). Use one or more of the following abbreviations in uppercase to identify your modification(s). If using more than one abbreviation, separate with a comma with no space after the comma. SC - Stormwater Canal ID - Irrigation Ditch IT - Interbasin Transfer BC - Barge Canal SD - Stormwater Ditch PD - Pipe Diversion CD - Channel Diversion NC - Non-Contributing Area KA - Karst LE - Levee NM - No Modifications OC - Overflow Channel DM - Dam at outlet or HU boundary GC - General Canal PS - Pumping Station DD - Drainage Ditch AD - Aqueduct RS - Reservoir TF - Transportation Feature (road, railroad, docks etc.) GF - Ground Water Flow MA - Mining Activity UA - Urban Area OT - Other Hu_12_type: Sixth Level Hydrologic Unit Type - (REQUIRED) Populate this field with the hydrologic unit type from the list provided that most closely identifies the subwatershed. Use any of the one digit abbreviations in uppercase that is provided in the list. 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). 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. HU_10_GNIS#: 5th level GNIS Feature Identification Number - (Field Required, Attribute Optional) The Geographic Names Information System (GNIS) has a unique Feature Identification Number for each officially recognized name in the country. This number is 6-7 characters long. If a hydrologic unit name uses two or mure features, then this field would have two GNIS feature numbers with a space separating each number. As of August, 2004 this field does not need to be populated, but plans are to developed a semi_automated method to do this. HU_12_GNIS#: 6th level GNIS Feature Identification Number - (Field Required, Attribute Optional) The Geographic Names Information System (GNIS) has a unique Feature Identification Number for each officially recognized name in the country. This number is 6-7 characters long. If a hydrologic unit name uses two or more features, then this field would have two GNIS feature numbers with a space separating each number. As of August, 2004 this field does not need to be populated, but plans are to developed a semi_automated method to do this. ArcInfo (.pat) and ArcView Polygon Format Item name Width Output Type (ArcView) N.Dec. Example Huc_8 8 8 C - 01080201 Huc_10 10 10 C - 0108020103 Huc_12 12 12 C - 010802010310 Acres 8 12 F N 0 026739 States 11 11 C - KS,MO,OK Ncontrb_a 8 12 F N 0 357 Hu_10_ds 10 10 C - 1710020504 Hu_10_name 80 80 C - Upper Blue River Hu_10_mod 20 20 C - CB,NC,ID Hu_10_type 1 1 C - S Hu_12_ds 12 12 C - 171002050402 Hu_12_name 80 80 C - Drift Creek-Big Bear River Hu_12_mod 20 20 C - SD,KA,PD Hu_12_type 1 1 C - C HU_10_GNIS# 23 23 C - 102354 238437 HU_12_GNIS# 23 23 C - 1023547 2384378
                          
Entity and Attribute Detail Citation
                            Federal Standard for Delineation of Hydrologic Unit Boundaries