Extending the National Hydrography Dataset: A Spatial Framework for
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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
Jackie StragerNatural Resource Analysis Centerwww.nrac.wvu.edu
Mike StragerDivision of Resource ManagementWest Virginia University
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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
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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
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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
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WV GIS Conference June 2008
Extending the NHD
• Extending NHD and related applications:1. Adding info: WV state stream codes and names2. Derived data: WV segment-level watersheds3. Additional data: NHD Plus
• Used in applied projects in fisheries, ecological assessments
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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)
along mainstem stream
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WV GIS Conference June 2008
1. Applications: Adding info to the NHD
• Mapping WV trout streams• Applying WV codes & NHD stream measures:
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WV GIS Conference June 2008
1. Applications: Adding info to the NHD
• Stream segmenting for crayfish project• 150m segments needed• Statewide, on stream by stream basis
Strader Run,South Branch Potomac
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WV GIS Conference June 2008
2. Derived data from NHD
• Segment-level watersheds for WV• Statewide coverage for 24K NHD
• Custom tools developed:– Determine upstream watersheds– Cumulatively total watershed variables– Determine distance to upstream features
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WV GIS Conference June 2008
2. Applications: Derived data
• Big sandy examples
Upper Little SandyCumulative area upstream ofabandoned minelands
Upper Little SandyDistance to closest upstream mine permit
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WV GIS Conference June 2008
2. Applications: Derived data
• Application: Mining intensity index (0-100)• Lower Cheat river basin• Function of:
• Cumulative area of mining features• Cumulative area of coal seam
outcrops
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WV GIS Conference June 2008
2. Applications: Derived data
• WVU Research• Fisheries Management
– Mussel distribution modeling (Alison Mynsberge)– Dr. Todd Petty and students
• Brook trout conservation (Jason Clingerman)• Landscape-water quality interactions (Eric Merriam)• Temperature model, swim distances (Roy Martin)
• Water Quality– Water Research Institute, WVU– Mass-balance water quality model using linked
watersheds, cumulative analysis
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WV GIS Conference June 2008
3. Additional NHD related data: NHD Plus
• NHD Plus• Available nationwide at 1:100,000 scale• Includes:
– New value-added attributes for streams• Thinner code • Flow• Stream order• Path length
– Segment level catchments – Modeling tools (software)
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WV GIS Conference June 2008
3. Applications: NHD Plus
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WV GIS Conference June 2008
3. Applications: NHD Plus
Catchments
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Summary
• Described in this talk:– NHD, plus WV stream codes, route measures– WV segment-level watersheds– NHD Plus
• Allows us to assess the influence of landscape factors on instream water quality and biota
• Datasets used in current ecological studies in Cheat, Tygart, Ohio River basins
• NHD and segment-based watershed data models provide useful framework for many present and future activities
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WV GIS Conference June 2008
Related links
Jackie StragerNatural Resource Analysis CenterWest Virginia University
[email protected](304) 293-4832 ext.4455
http://www.horizon-systems.com/NHDPlus/
http://nhd.usgs.gov/