1 / 34

Introduction to NHD Plus: A Framework for Advanced Water Applications

Introduction to NHD Plus: A Framework for Advanced Water Applications. Cindy McKay Horizon Systems Corporation. NHD Plus. An integrated suite of application-ready, geospatial, surface water data products First successful national attempt to integrate the NHD, NED, and WBD

beulah
Download Presentation

Introduction to NHD Plus: A Framework for Advanced Water Applications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Introduction to NHDPlus:A Framework for Advanced Water Applications Cindy McKay Horizon Systems Corporation

  2. NHDPlus An integrated suite of application-ready, geospatial, surface water data products First successful national attempt to integrate the NHD, NED, and WBD Used Snapshots of NHD, NED, and WBD National Hydrography Dataset (NHD) National Elevation Dataset (NED) Watershed Boundary Dataset (WBD) 1

  3. NHDPlus links the landscape to the mapped stream network 2

  4. NHD Stream Network and WBD Boundaries Enforced into the NED WBD Boundary Cells “walled” Into Elevation NHD Stream Cells “burned” into Elevation 3

  5. NHDPlus– What’s Inside? NHD Feature Classes & Tables Greatly improved 1:100K National Hydrography Dataset NED Elevation Grids PLUS (8 more components): Stream Network Value Added Attributes Flow Direction and Flow Accumulation Grids Elevation-based Catchments Catchment Attributes Flowline Attributes Cumulative Upstream Area Attributes Flow Volume & Velocity Estimates Network Locations of USGS Flow Gaging Stations 4

  6. Value Added Attributes (VAAs) For the Stream Network • Stream Level • FromNode/ToNode • Hydrologic Sequence • Divergence Main Path • Start/Terminal Flags • QAQC’ed Connectivity Table • Stream Order • Waterbody Identifier • Network Identifier • Level Path Identifier • Distance to Terminus Navigation Analysis Display/Performance • Network Thinner

  7. Flow Direction Grid (FDR) A 30 meter grid in national Albers projection Each cell points down hill to the neighboring cell with the lowest elevation Supports “rain drop” tools

  8. Flow Accumulation Grid (FAC) A 30 meter grid in national Albers projection Each cell contains a count of the number of grid cells that drain to that cell Used to generate a elevation-based “synthetic” stream network Used to guide basin delineation 7

  9. Catchments for Each Stream Segment Definition: The portion of the land surface that drains to a network segment NHDPlus includes catchments in grid format and as polygons

  10. Catchments for Each Coastline Segment

  11. Catchment Attributes • Mean Annual Temperature (Prism - 4km) • Mean Annual Precipitation (Prism - 4km) • % of each of the 21 land use classifications from the 1992 National Land Cover Dataset (NLCD) • Headwater Node Area 10

  12. Flowline Attributes Raw minimum/maximum elevations Smoothed minimum/maximum elevations Slope 11

  13. Cumulative Characteristics Mean Annual Precip and Temp Needed for stream flow estimates Drainage Area Needed for stream flow & velocity estimates 21 NLCD Land Use Categories Very handy to have 12

  14. Flow Volume & Velocity Estimates Mean Annual Flow volume Two Methods: Unit Runoff & Vogel Velocity Jobson Method 13

  15. Network Locations of USGS Stream Gages Gage id: 01586500 Station Name North Br Patapsco River Reachcode: 02060003001478 Drainage Area: 91 mi2 Max Daily Flow: 3550 Avg Daily Flow: 102.4 Plus many flow statistics

  16. A Quick NHDPlus Desktop Application

  17. STEP 1

  18. STEP 2

  19. STEP 3

  20. STEP 4

  21. STEP 5

  22. STEP 6

  23. STEP 7

  24. STEP 8 Value Added Attributes Temperature & Precipitation Flow Volume & Velocity Land Use

  25. Watershed Characterization • Main Stem: Huntsville Spring Branch • Stream Order: 3 • Stream Level: 4 • Area weighted precipitation 1431.2 mm • Area weighted temperature 15.3 oC • Land Use • Open Water 1% • Residential 28% • Commercial/Ind/Trans 9% • Barren 1% • Forest 33% • Pasture/Hay 5% • Row Crops 12% • Urban/Rec Grasses 5% • Wetlands 5% • Other 1% • Drainage area 180.5 km2 • Mean Annual Flow (UROM) 128.6 cfs • Mean Annual Flow (Vogel) 123.7 cfs • Mean Annual Velocity (UROM) 0.95 fps • Mean Annual Velocity (Vogel) 0.87 fps

  26. A Quick NHDPlus Web Application

  27. Questions? http://nsdi.epa.gov/waters/ Click on the “NHDPlus” Link 33

More Related