Extending the National Extending the National Hydrography Dataset: Hydrography Dataset: A Spatial Framework for A Spatial Framework for Water Resources Applications in West Water Resources Applications in West Virginia Virginia Jackie Strager Natural Resource Analysis Center www.nrac.wvu.edu Mike Strager Division of Resource Management West Virginia University
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Extending the National Hydrography Dataset: A Spatial Framework for Water Resources Applications in West Virginia Jackie Strager Natural Resource Analysis.
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Extending the National Extending the National Hydrography Dataset:Hydrography Dataset:
A Spatial Framework for A Spatial Framework for Water Resources Applications in West VirginiaWater Resources Applications in West Virginia
Mike StragerDivision of Resource ManagementWest Virginia University
WV GIS Conference June 2008
Introduction
• NHD as a foundation for water resources analysis in GIS
• NHD overview• Applications
• Adding information to NHD• Deriving additional data using NHD
framework• Additional related datasets
WV GIS Conference June 2008
What is the NHD?
• National Hydrography Dataset• Nationwide, consistent format• WV NHD includes:
– Medium resolution (1:100,000)– High resolution (1:24,000)– Local resolution pilots (1:4,800)
* Seminar Thursday AM
WV GIS Conference June 2008
• NHD includes:– Surface water features– Flow model– Route measure model
• Extending NHD and related applications:– Adding info: WV state stream codes and names– Derived data: WV segment-level watersheds– Additional data: NHD Plus
Properties of the NHD
Direction of flow
1 mile
2 miles
Route measures
WV GIS Conference June 2008
Extending the NHD
• Extending NHD and related applications:1. Adding info: WV state stream codes and names
2. Derived data: WV segment-level watersheds
3. Additional data: NHD Plus
• Used in applied projects in fisheries, ecological assessments
WV GIS Conference June 2008
1. Adding info to the NHD
• NHD 1:24,000 flowlines• Added WV state stream names and codes
(WVDEP)– Unique reference for each stream as a whole– References state data to streams– All streams have some name, even if NHD has none– Unnamed tributaries named using reference point (River Mile)