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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
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)
along mainstem stream
WV GIS Conference June 2008
1. Applications: Adding info to the NHD
• Mapping WV trout streams• Applying WV codes & NHD stream measures:
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
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
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
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
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
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)
WV GIS Conference June 2008
3. Applications: NHD Plus
WV GIS Conference June 2008
3. Applications: NHD Plus
Catchments
WV GIS Conference June 2008
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
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/