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National Watershed Boundary Delineation
STATUS:   Current

Contact:  Karen Hanson
Funding Organization:  U.S. Geological Survey
Web:  http://ut.water.usgs.gov/projects/wbd/

Subject:  watershed, land use, water availability
Category:  Research
Data Type:  Water Quality
Start Date:  Thursday, May 01, 2003

Abstract:  The objective is to delineate and define watersheds that form BLM lands to the 6th level with a consistent, reproducible method that meets National standards and that is accepted by all agencies, public land users, and user representatives.

Defines the aerial extent of water drainage to a point
Establishes a base-line drainage boundary framework accounting for all land and surface areas
Impartial to any administrative units, special projects, particular program or agency
At a minimum, the hydrologic units must be delineated and georeferenced to USGS 1:24,000-, 1:25,000, or 1:63,360-scale topographic maps, which meet National Standards for Spatial Data Accuracy
Digitial Orthophoto Quarter Quadrangles (DOQQs) or higher resolution imagery, contours of elevation, stream locations and other relevant data are useful in improving the accuracy of the hydrologic unit boundaries

Organizations:   U.S. Geological Survey

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