wbd_huc12
Description | Spatial | Data Structure | Metadata
Description
Citation
Title: wbd_huc12
Data type: vector digital data
Data Constraints and Credit
Access constraints:
None
Use constraints:
None
Spatial Reference Information
Horizontal Coordinate System
Coordinate System Details
Geographic coordinate system
Latitude resolution: 8.98315284119521e-009
Longitude resolution: 8.98315284119521e-009
Geographic coordinate units: Decimal Degrees
Geodetic model
Horizontal datum name: D WGS 1984
Ellipsoid name: WGS 1984
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257223563
Spatial Domain
Below are the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Unprojected coordinates (geographic)
Boundary Coordinate
West -124.771480 (latitude)
East -66.004356 (latitude)
North 49.384479 (longitude)
South 24.512236 (longitude)
Data Structure and Attribute Information
Name and Format
Data type: vector digital data
Native dataset environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959
Overview
Entity and attribute overview:
1) .pat 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:
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.

The Acres field for the WBDHU12 polygon layer was calculated after reprojection using
"North America Albers Equal Area Conic.prj". Calculations in the UTM projection could vary significantly.

Steps used in Calculation after reproject to Albers:

Calc Area for shapefile

Select entire "Area" column, right click, "Calculate Values"
Direct spatial reference method: Vector
Attributes of wbd_huc12
Description:
polygons identify watershed boundaries
Source:
n/a
Attributes
OBJECTID_1
Definition:
Internal feature number.
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
ESRI
objectid
Definition:
Internal feature number.
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source:
ESRI
Shape
Definition:
Feature geometry.
Attribute values: Coordinates defining the features.
Attribute definition source:
ESRI
HUC_8
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HUC_10
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HUC_12
Definition:
This field provides a unique 12-digit code for each subwatershed derived from the 10-digit code.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
ACRES
Definition:
Area of subwatershed including non-contributing areas calculated to acres as a whole number, no decimals.
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
hu_10_gnis
hu_12_gnis
STATES
Definition:
The "States" field includes the names of all state(s) that the subwatershed falls within.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
NCONTRB_A
Definition:
Drainage areas that do not flow toward the outlet of any hydrologic unit are considered non-contributing.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_DS
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_NAME
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_MOD
Definition:
This field identifies interbasin transfers (IT), dams at outlet (DM), etc. that modify natural overland flow as modifications are identified from most significant to least significant modification(s).  Hydrologic units with no modification are marked with NM.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Modification by the Natural Resources Conservation Service to the Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_10_TYPE
Definition:
This field identifies the type of watershed.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_DS
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_NAME
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 value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
meta_id
HU_12_MOD
Definition:
This field identifies interbasin transfers (IT), dams at outlet (DM), etc. that modify natural overland flow as  Modifications are identified from most significant to least significant modification(s).  Hydrologic units with no modification are marked with NM.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
HU_12_TYPE
Definition:
This field identifies the type of watershed.
Attribute value codeset domain
Codeset Description
Name Federal Standards for the Delineation of Hydrologic Unit Boundaries
Source
Please refer to the Entity and Attribute Overview for valid values
Attribute definition source:
Federal Standards for Delineation of Hydrologic Unit Boundaries
st_area_sh
st_length_
Shape_Length
Definition:
Length of feature in internal units.
Attribute values: Positive real numbers that are automatically generated.
Attribute definition source:
Esri
Shape_Area
Definition:
Area of feature in internal units squared.
Attribute values: Positive real numbers that are automatically generated.
Attribute definition source:
Esri
SDTS Feature Description
Spatial data transfer standard (SDTS) terms
Feature class
Type: GT-polygon composed of chains
Count: 88302
Metadata Reference
Metadata Date
Last updated: 20170301
Metadata Standards
Standard name: FGDC Content Standard for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 1.7
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It shows metadata elements defined in the Federal Geographic Data Committee (FGDC) standard and the ESRI Profile of the Content Standard for Digital Geospatial Metadata (ESRI Profile). This stylsheet is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or techical support.
Instructions: Click the title on the top of the page to toggle opening and closing all metadata content sections. Or tab to individual sections by clicking the section links listed horizontally below the title. Section names are centered and shown in white with a blue background. Click on a section name (e.g. Description) to open and close all section content, or individually click terms listed on the left (Status, Key Words, etc.) to individually open and close section content items. Note, some section content items (Citation, Description, etc.) are intentionally opened by default due to their importance.
Key features: Supports W3C DOM compatible browsers such as IE6, Netscape 7, and Mozilla Firefox. Metadata content organized into sections that expand and collapse. Click on title to toggle opening and closing all content (metadata sections). Page header includes menu links that tab to invidual metadata sections. Page footer links to http://www.fgdc.gov/ web site. Ignores metadata XML elements that contain all whitespace (spaces, carriage returns, tabs, line feeds, etc). Over 40 metadata elements are parsed to respect line breaks introduced by metadata author to either start a new line or a new paragraph, depending on number of consecutive line breaks and white space characters present. Over 40 metadata elements are searched for internal URL strings (that contain a "://" or "www.") and converts each one to a hypertext link. Browse graphic image and description displayed together on same page if image is JPG, JPEG, GIF, PNG, or BMP. Other browse graphic file types such as PDF popup in separate window. Enumerated attribute domain values listed in HTML table, which can be opened and closed. All FGDC metadata elements supported. FGDC Process Steps include full descriptions of each Data Source Used and Produced as long as the value of Process Step's Source Citation Used (srcused) and Source Citation Produced (srcprod) metadata element match a Data Source Citation (srccitea) metadata element value. All ESRI metdata elements supported except for Binary elements used to include thumbnail image. Includes ESRI Geoprocessing History, ESRI Feature Terms, ESRI Geometric Network, ESRI Subtype, ESRI Relationship Class, ESRI Topology, and ESRI Raster elements. Topology rules are named and described as shown on the ESRI topology_rules_poster.pdf included with ArcGIS software.
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NEPAssist: Metadata