Subwatersheds (SubWatershedPly)

Keywords
About: environment, hydrology, subwatershed
Taking place at: Washington, D.C., District of Columbia, DC, DC GIS, DCGIS

Abstract

This dataset is a complete digital hydrologic unit boundary layer to the subwatershed (12-digit) 6th level at 1:24,000 scale. 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 ). The hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas.

Polygons are attributed with hydrologic unit codes, names, downstream hydrologic unit, flow modifications, and hydrologic unit type for 4th level (8-digit) sub-basin, 5th level (10-digit) watershed, 6th level (12-digit) subwatershed, and acres for subwatershed. An accompanying line shapefile is attributed with the highest hydrologic unit level for each hydrologic unit, linesource, and a metadata reference file.

All DC GIS data is stored and exported in Maryland State Plane coordinates NAD 83 meters.

METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.

Purpose

This data is used for the planning and management of Washington, D.C. by local government agencies.

Access constraints

Contact OCTO GIS. Any data obtained outside of OCTO GIS are unauthorized copies.

Use constraints

Acknowledgment of the DC Geographic Information Systems Program (DC GIS). The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.

Point of contact

GIS Data Coordinator
in Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

fax: 202-727-5660
hours: 8:30am - 5:30pm

Credits

United States Geologic Survey

Data accuracy

Accuracy
Validated by source and/or responsible agency.

Logical consistency
Validated by source and/or responsible agency.

Completeness
Validated by source and/or responsible agency.

Horizontal positional accuracy
1:24000 source scale.

Vertical positional accuracy
N/A

Lineage / Sources

• Water Boundary Data - 12 digit Hydrologic Units
  geofile, locations and attribution
  Water Boundary Data - 12 digit Hydrologic Units
  by United States Geologic Survey

Distribution

Most DC GIS datasets can be downloaded from "http://dcgis.dc.gov" on the data center page. Orders can also be made by contacting OCTO GIS at "dcgis@dc.gov", especially for datasets not available for download.

Distribution liability
Acknowledgment of the DC Geographic Information Systems Program (DC GIS). The District of Columbia Government makes no claims as to the completeness, accuracy or content of any data contained hereon, and makes no representation of any kind, including, but not limited to, the warranty of the accuracy or fitness for a particular use, nor are any such warranties to be implied or inferred with respect to the information or data furnished herein.

Distributed by
GIS Data Coordinator
in DC Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

fax: (202) 727-5660
hours: 8:30 am - 5:30 pm

Entity

DCGIS.SubWatershedPly

Attributes

• Shape / ESRI
  Feature geometry
• WATSHD_NAM
  Watershed Name
• HUC_10
  10 Digit (watershed) Hydrologic Unit Code
• HUC_12
  12 Digit (subwatershed) Hydrologic Unit Code
• OBJECTID / ESRI
  Internal feature number.
• SHAPE_LENG
  
• SHAPE / ESRI
  Feature geometry.
• Shape_Leng
  
• NAME
  Subwatershed Name
• SHAPE.AREA
  
• SHAPE.LEN
  

Metadata

Provided by
GIS Data Coordinator
in D.C. Office of the Chief Technology Officer

441 4th St NW, Suite 930 South
Washington DC, 20001, USA

fax: (202) 727-5660
hours: 8:30 am - 5 pm