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1 The National Hydrography Dataset Plus What is NHDPlus?

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Presentation on theme: "1 The National Hydrography Dataset Plus What is NHDPlus?"— Presentation transcript:

1 1 The National Hydrography Dataset Plus What is NHDPlus?

2 2 How will this vision be attained? Vision for a National Geospatial Surface Water Framework National Elevation Dataset (NED) National Hydrography Dataset (NHD) Watershed Boundary Dataset (WBD)

3 3 The Team EPA Project Lead Tommy Dewald Horizon Systems Cindy McKay Jen Hill Bob Deffenbaugh USGS WRD Al Rea Rich Moore Craig Johnston Modeling Consultant Tim Bondelid

4 4 NHD Plus An integrated suite of application-ready geospatial surface water data products. It’s the first national effort to integrate:  National Hydrography Dataset (NHD)  National Elevation Dataset (NED)  National Watershed Boundary Dataset (WBD)  National Land Cover Dataset (NLCD) NHDPlus links the mapped stream network to the landscape.

5 5 NHD Plus – What’s Inside? NHD Greatly improved 1:100K National Hydrography Dataset Greatly improved 1:100K National Hydrography Dataset PLUS (9 more components):  Value Added Attributes  Elevation-based Catchments  Catchment Characteristics  Headwater Node Areas  Cumulative Drainage Area Characteristics  Flow Direction, Flow Accumulation, and Elevation Grids  Min/Max Elevations and Slopes  Flow Volume & Velocity Estimates  Flow Gages with Network Locations

6 6 A Framework dataset that includes: Hydrographic features for making mapsHydrographic features for making maps A national stream addressing systemA national stream addressing system A modeling network for navigating upstream/downstreamA modeling network for navigating upstream/downstream A maintenance infrastructureA maintenance infrastructure User updatesUser updates Distributed formats – personal geodatabase, shapefiles, coveragesDistributed formats – personal geodatabase, shapefiles, coverages Compatible with ArcHydro Model & ToolsCompatible with ArcHydro Model & Tools What is the National Hydrography Dataset (NHD)? Impairment Drinking Water Intake

7 7 Value-Added Attributes  A set of two dozen network characteristics  Derived from native NHD content  For Analysis, Navigation & Display (Stream Order, Stream Level, Waterbody-Network link and more…)

8 8 Elevation Grid (elev_cm) National Elevation Data (NED) used to create the NHDPlus

9 9 Hydrologically-Conditioned Elevation National Hydrography Dataset (NHD) Watershed Boundary Dataset (WBD) National Elevation Dataset (NED)

10 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 5

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

12 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 13 Flowline Attributes  Raw min/max elevations  Smoothed min/max elevations  Slope  Cumulative drainage area  Cumulative land use classifications  Flow volume, incremental inflow – Unit Runoff Method  Flow volume – Vogel Method  Velocity – Jobsen

14 14 USGS Gage Point Events on NHDPlus – Coming Soon! Many Attributes: Gage ID Reachcode/Measure Lat/Long Agency Station Name Several Dozen Flow Stats And more…

15 15 62 units total Distribution Units for Elevation, FAC, and FDR Grids

16 NHDPlus Distribution Units for NHD, Catchments, and Attribute Tables U L

17 17 Linking Data to the NHDPlus Area Links Waterbody Reach: shape Linear Links Linear Reach: From Measure: 15.0 To Measure: Linear Reach: Measure: Point Links

18 18 Things Linked to NHDPlus  EPA Water Programs Water Quality StandardsWater Quality Standards Water Quality Monitoring StationsWater Quality Monitoring Stations Assessed WatersAssessed Waters Impaired WatersImpaired Waters Nonpoint Source ProjectsNonpoint Source Projects BeachesBeaches Fish Consumption AdvisoriesFish Consumption Advisories Sewage No Discharge ZonesSewage No Discharge Zones Permitted DischargersPermitted Dischargers Drinking Water IntakesDrinking Water Intakes Drinking Water WellsDrinking Water Wells Clean Watershed NeedsClean Watershed Needs Special Appropriations ProjectsSpecial Appropriations Projects And More…And More…  USGS Flow Gages

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22 22 A Quick Example of Analysis Using NHDPlus

23 23 STEP 1

24 24 STEP 2

25 25 STEP 3

26 26 STEP 4

27 27 STEP 5

28 28 STEP 6

29 29 STEP 7

30 30 ValueAddedAttributesTemperature&Precipitation LandUse FlowVolume&Velocity STEP 8

31 31 Watershed Characterization Main Stem: Huntsville Spring Branch Stream Order: 3 Stream Level: 4 Area weighted precipitation mm Area weighted temperature 15.3 o C 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 km 2 Mean Annual Flow (UROM) cfs Mean Annual Flow (Vogel) cfs Mean Annual Velocity (UROM) 0.95 fps Mean Annual Velocity (Vogel) 0.87 fps

32 32 Importance of the NHDPlus  The NHDPlus Is a Complete Analytical Tool  Very Robust Stream Network  New Attributes for Improved Applications  Catchments, FDR, FAC and Elevation Add the Landscape into the Analytic Environment  Watershed Delineation and Characterization  Integration with virtually any landscape dataset  Models!!!!

33 33 NHDPlus – What’s Available?  Data: Great Lakes (04) Great Lakes (04) Mississippi (05, 06, 07, 08, 10, 11 and 0318) Mississippi (05, 06, 07, 08, 10, 11 and 0318) Texas (12) Texas (12) Rio Grande (13) Rio Grande (13) Colorado (14 and 15) Colorado (14 and 15) Great Basin (16) Great Basin (16) Pacific Northwest (17) Pacific Northwest (17) California (18) California (18) New England (01) New England (01) Mid-Atlantic (02) Mid-Atlantic (02) By End of September – South Atlantic (03), Souris-Red-Rainy (09) By End of September – South Atlantic (03), Souris-Red-Rainy (09)  Documentation: User Guide User Guide Various Presentations Various Presentations Metadata Metadata Release Notes for each hydro region Release Notes for each hydro region  Training: Eight Exercises/Tutorials Eight Exercises/Tutorials  Tools: NHD Flow Table Navigator NHD Flow Table Navigator NHDPlus VAA Navigator NHDPlus VAA Navigator #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

34 34 Where to get NHDPlus Data, Documentation, Presentations, Exercises and Tools Web Site: Click on “NHDPlus”http://www.epa.gov/waters Web Site: FTP Site: ftp://ftp.horizon-systems.com/nhdplusftp://ftp.horizon-systems.com/nhdplus Fall 2006:In the EPA Waters Database


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