1. Putting NHDPlus to Work 2006 ESRI User Conference San Diego, CA August 8, 2006 2006 ESRI User Conference San Diego, CA August 8, 2006 NHD and NHDPlus Applications Session Presented by: Kristen Gunthardt (for Tommy Dewald) US EPA, Office of Water

2. Presentation Overview  Enhancing the NHD Framework with NHDPlus  EPA Applying the NHD and NHDPlus  Applications – Just a Start  Enhancing the NHD Framework with NHDPlus  EPA Applying the NHD and NHDPlus  Applications – Just a Start

3. Enhancing the NHD Framework with NHDPlus!  NHD Hydrographic features for making maps Hydrographic features for making maps A national stream addressing system A national stream addressing system A modeling network for navigating upstream/downstream A modeling network for navigating upstream/downstream A maintenance infrastructure A maintenance infrastructure  NHDPlus Improved network relationships and additional names Improved network relationships and additional names Value-added attributes Value-added attributes NHD reach catchments with attributes NHD reach catchments with attributes Flow grids Flow grids Network node elevations Network node elevations Flow volume and velocity (original goal!) Flow volume and velocity (original goal!) Stream gages linked to stream network Stream gages linked to stream network

4. NHDPlus NHDPlus includes Topographically-Derived Catchments (2,613,709 total catchments)

5. Quad Density Artifacts in NHD

6. NHD with Flow Volume > 2 cfs: Hydrologic Equity

7. National Hydrography Hydrography Dataset Dataset WATERS Data Architecture Nonpoint Source Grants Impaired Waters & Total Maximum Daily Loads Water Quality Assessments Water Quality Monitoring Water Quality Standards (Watershed Assessment, Tracking & Environmental ResultS) (www.epa.gov/waters) GRTS WQSDB NTTS STORET ADB/NAD Reach Address Database (RAD)

8. Assessing Recovery Potential of Impaired Waters  Joint OW/ORD project  Recovery potential: the likelihood of an impaired water to reattain Water Quality Standards, given its ecological capacity to regain lost functions, its exposure to stressors, and its social context.  Opportunity to consider landscape factors related to recovery potential within drainage areas and stream corridors, using GIS

9. Endangered Species: An Example Potential Use of NHD in Pesticide Risk Assessments Figure 2  The Office of Pesticide Programs is exploring the use of the NHD and value-added attributes in a variety of applications related to pesticide risk assessments.  In this example, NHD navigation tools are combined with the NLCD and NHD catchments (Thiessen-based) to estimate the direct and indirect effects of agricultural pesticide use on endangered aquatic species. Figure 1

10. USGS NAWQA SPARROW Modeling  Original USGS SPARROW (Spatially Referenced Regressions on Watershed Attributes) water quality models based upon Reach File Version 1 (RF1) 1:500,000-scale  Success of EPA-funded NHD- based New England SPARROW model (at right) has motivated plan to conduct similar modeling for several USGS NAWQA study areas during 05/06

11. SPARROW Model Results: Predicted Total Nitrogen Catchment Yield Contributions to Total Nitrogen from each source AtmosphericDeveloped AgriculturePoint Source = + ++

12. USGS NAWQA SPARROW Models for Major River Basins

13. Relative Debris-Flow Hazard In Response to 2”of Rainfall in 1 Hour Brins Fire, Arizona June 2006 Low Moderate High Very High ARIZONA FLAGSTAFF PHOENIX SEDONA STUDY AREA Relative Hazard

14. USGS StreamStats  StreamStats is a web application that greatly reduces the time needed to estimate streamflow statistics for ungaged sites and to make published streamflow statistics for USGS data-collection stations easily accessible  Based upon state-specific regression equations  Supports TMDLs

16. RWDB GEOGRAPHIC COVERAGE:   296 hydrologic units (4th-code HUCs)   23,342 surface water segs.   300 pulp & paper facilities (approx.) RWDB LOGISTICS:   Linux Server: 0.5TB, 4-Disc RAID w/off-site auto backup   784,528 data records/files   >14,000 spatial data files RWDB INFORMATION TYPES:   Watershed Characteristics Topography, HUCs, ecoregions, landuse/cover, soils, stream flow, weather, dams, gauges   Water Quality Chemistry, bacteriological, sediment inventory, temperature, turbidity, chlorophyll   Regulatory WQS, impairment listings and delistings, TMDL status, nutrient criteria   Facility Data Mill (and other) discharge, PCS, TRI, RCRA, Superfund info. NCASI Receiving Water Database National Council for Air and Stream Improvement, Inc.

17. For More Information  Visit www.epa.gov/waters www.epa.gov/waters  Tommy Dewald, dewald.tommy@epa.gov dewald.tommy@epa.gov  Kristen Gunthardt, gunthardt.kristen@epa.gov Questions?Questions?