1 / 45

The National Hydrography Dataset Plus ( NHDPlus )

The National Hydrography Dataset Plus ( NHDPlus ). Why Build NHDPlus?. Nationally consistent water modeling and analysis capability Based on NHD due to wealth of water information linked to NHD Flow volume/velocity for each NHD network segment

reegan
Download Presentation

The National Hydrography Dataset Plus ( NHDPlus )

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. The National Hydrography DatasetPlus(NHDPlus)

  2. Why Build NHDPlus? • Nationally consistent water modeling and analysis capability • Based on NHD due to wealth of water information linked to NHD • Flow volume/velocity for each NHD network segment • Integration of landscape with mapped stream network

  3. What is NHDPlus? • An integrated suite of application-ready, geospatial, surface water data products. • Links the mapped stream network to the landscape. • Integrate the NHD, NED, and WBD on a national basis. National Hydrography Dataset (NHD) National Elevation Dataset (NED) Watershed Boundary Dataset (WBD)

  4. NHDPlus Components NHD Greatly improved 1:100K National Hydrography Dataset PLUS (9 more components): • Value Added Attributes • Flow Direction, Flow Accumulation, and Elevation Grids • Headwater Node Areas • Min/Max Elevations and Slopes • Elevation-based Catchments • Catchment Characteristics (temp, precip, land use) • Cumulative Drainage Area Characteristics • Flow Volume & Velocity Estimates • Network Locations of USGS Flow Gaging Stations

  5. 2 1 Impairment Drinking Water Intake 3 What is the National Hydrography Dataset (NHD)? • A Framework dataset that includes: • Hydrographic features for making maps • A national stream addressing system • A modeling network for navigating upstream/downstream • A maintenance infrastructure • User updates • Distributed formats – personal geodatabase, shapefiles, coverages • Compatible with ArcHydro Model & Tools

  6. Point Links Linear Links Linear Reach: 02020005000375 Measure: 48.247 Linear Reach: 05030204004722 From Measure: 15.0 To Measure: 90.00 Waterbody Reach: 06030102002785 + shape Area Links Linking Data to the NHDPlus

  7. Things Linked to NHDPlus • EPA Water Programs • Water Quality Standards • Water Quality Monitoring Stations • Water Quality Assessments • Impaired Waters • TMDLs • Nonpoint Source Projects • Beach Closures • Fish Consumption Advisories • Permitted Dischargers • Drinking Water Intakes • And More… • USGS Flow Gages

  8. Value-Added Attributes (Stream Order, Stream Level, Waterbody-Network link and more…) • A set of two dozen network characteristics • Derived from native NHD content • For Analysis, Navigation & Display

  9. Elevation Grid (elev_cm) National Elevation Data (NED) used to create the NHDPlus

  10. Flow Direction Grid (FDR) Cells point down hill to the neighboring cell with the lowest elevation Flow Accumulation Grid (FAC) Cells contains the count of the number of cells that are uphill

  11. Catchment Grid & Shapefile The portion of the land surface that drains to a network flowline

  12. 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)

  13. Flowline Attributes • Raw min/max elevations • Smoothed min/max elevations • Slope • Cumulative drainage area • Cumulative land use classifications • Flow volume – Unit Runoff and Vogel Methods • Velocity – Jobsen

  14. USGS Gaging Station Locations • Many Attributes: • Gage ID • Reachcode/Measure • Lat/Long • Agency • Station Name • Several Dozen Flow Stats • And more…

  15. High Resolution NHDPlusfor a State - Considerations • Hydrologic location • Ingredient Data Availability • Data Quality

  16. 20 20 Hydrologic Location 09 17 10U 01 04 02 07 16 10L 14 05 18 11 06 15 13 08 03 0318 12 06 10 01 02 03 11 12 14 16 17 18 20 04 09 07 05 13 0318 15 08

  17. Ingredients • NHD • Elevation • WBD • Landscape Data

  18. NHD • Requires properly connected linear network • HR qaqc more difficult due to loss of independent flow table • Requires accurate coordinate ordering • Requires topological connectivity • Requires good names, no branched names, no disjoint names • Isolated Network analysis • Divergence classification [major vs minor paths] – New Attributes?

  19. Network States • Connected only at certain seasons • Connected only during certain flow conditions • Manual flow controls • Bi-directional flow in canal/ditches • Bi-directional flow in tidal areas How to represent these varying hydrologic states of the network in NHD – new attributes?

  20. Elevation • Paneled together • Continuous coverages • Edge artifacts removed • The closer this corresponds to the NHD streams the better – Hydro-enforced • Smoothed stream elevation profiles [required for velocity]

  21. WBD • Optional but improves the process • The closer these boundaries correspond to the NHD streams the better

  22. Landscape Data • Temperature • Precipitation • Other characteristics required for various flow estimation algorithms • Land Cover

  23. Miscellaneous Data • Stream Gage flow statistics [required for flow estimation, flow qaqc, catchment qaqc] • Requires stream gages accurately indexed to NHD flowlines

  24. Boundary Conditions • Incoming Boundary Conditions • depends on flow estimation approach • drainage area boundaries outside area of interest • flow discharge into area of interest • miles of stream upstream • location of inflowing streams • Outflowing Boundary Conditions • distance to network termination • location of outflowing streams • Return flows - Connections between outflowing and inflowing network segments

  25. NHDPlus Data Model • NHD Component - shapefiles and dbfs in NHD Data Model NHDPlus06 Hydrography <NHD feature classes> HydrologicUnits <HUC shapefiles> <NHD tables> • Drainage Catchment grid Catchment Shapefile • Rasters - ESRI grids • Additional Tables - dbfs

  26. NHDPlus Tools Published • Navigators (interactive and batch) In Development • Basin Delineation (interactive and batch) • Catchment Attribute Allocator and Accumulator • Endangered Species Aquatic Exposure Assessment

  27. What can be done with NHDPlus? • Hydrologic position analysis (upstream/downstream, how far, how long) • Basin delineation and characterization • In-stream Fate/Pollutant Routing Modeling • Framework for linking any landscape GIS layer to the stream network

  28. STEP 1

  29. STEP 2

  30. STEP 3

  31. STEP 4

  32. STEP 5

  33. STEP 6

  34. STEP 7

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

  36. 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

  37. Questions?

  38. #0 – Preparation #1 – Setting Up The Data #2 – Linking Data to NHD #3 – Navigating with Geometry #4 – Navigating with VAAs & Flow Table #5 – Network Analysis #6 – Raster Dataset #7 – Watershed Delineation #8 – Simple Model NHDPlus – What’s Available? • Data: • Pacific Northwest (hydro region 17) • Mississippi (hydro regions 05, 06, 07, 08, 10, 11 and 0318) • Colorado (hydro regions 14 and 15) • Next Week – Great Lakes (04), Texas (12), Rio Grande (13), Great Basin (16), and California (18) • By End of September – New England (01), Mid-Atlantic (02) South Atlantic (03), Souris-Red-Rainy (09) • Documentation: • User Guide • Various Presentations • Metadata • Release Notes for each hydro region • Training: • Eight Exercises/Tutorials • Tools: • NHD Flow Table Navigator • NHDPlus VAA Navigator

  39. Where to get NHDPlus Data, Documentation, Presentations, Exercises and Tools Web Site: http://www.horizon-systems.com/nhdplus Web Site: http://www.epa.gov/waters FTP Site: ftp://ftp.horizon-systems.com/nhdplus Fall 2006: In the EPW Waters Database Email: NHDPlus@HSCNET.COM

  40. Purpose (2 minutes) Provide a nationally consistent water quality modeling capability NHD must be framework due to wealth of indexed water info flow vol/velocity for each segment of NHD network Integration of landscape with mapped stream networkData Sources and Quality Considerations (10) NHD Requires fully connected linear network HR qaqc more difficult due to loss of independent flow table Requires accurate coordinate ordering Requires topological connectivity Requires good names, no branched names, no disjoint names Iso-net analysis divergence classification [major vs minor paths] Elevation Panelled together, continuous, with edge artifacts removed the closer this corresponds to the vector streams the better WBD optional but improves the process the closer this corresponds to the vector streams the better Land cover [optional] Temp, Precip and other characteristics raster [required for various flow estimation algorithms] Smoothed stream elevation profiles [ required for velocity] Stream Gage flow statistics [required for flow estimation, flow qaqc, drainage area qaqc] Requires stream gages accurately indexed to NHD flowlines Incoming Boundary conditions depends on flow estimation approach drainage area boundaries outside area of interest land cover flow discharge Miles of stream Outflowing Boundary conditions distance to network termination Return flows Connections between outflowing and inflowing network segmentsContent (10) Improved NHD - vector NHD VAAs Elevation raster FAC raster FDR raster Catchments - raster and vector Headwater Node drainage areas Catchment Characteristics (land use, temp, precip) Flowline Characteristics (Min/Max stream segment elevations (raw and smoothed), slope) Cumulative Drainage Area Characteristics (drainage area, land use, temp, precip) Flow Volume and Velocity estimatesData Model (3) NHD Component - shapefiles and dbfs in NHD Data Model Rasters - ESRI grids Additional Tables - dbfsTools (5) Published Navigators (interactive and batch) In Development Basin Delineation (interactive and batch) Landscape Attribute Allocator and Accumulator Endangered Species Aquatic Exposure AssessmentWhat's it do for you? (10) hydrologic position analysis (upstream/downstream, how far, how long) basin delineation and characterization In-stream Fate/Polutant Routing Modeling Framework for linking any landscape GIS layer to the stream network Discuss briefly some user apps that we're aware of - Tommy will do thisQuestions (5)

  41. Agenda • Why Build NHDPlus (2) • What is NHDPlus (10) • Data Content and Quality Needed to Build NHDPlus (10) • Data Model (3) • Tools (5) • What you can do with NHDPlus (10) • Questions (5)

  42. NHDPlus – Hydrologic Conditioning of the Elevation National Hydrography Dataset (NHD) Watershed Boundary Dataset (WBD) National Elevation Dataset (NED)

More Related