1Contractor for the USGS at the EROS Data Center

NHD Plus as a geospatial framework for drought

indicators

Jim Verdin

2Contractor for the USGS at the EROS Data Center

Digital Watershed

NHDPlus

NOAA ASOS

USGS NWIS Streamflow

A Digital Watershed connects geospatial and temporal water

resources data

NRCSSnotel

3Contractor for the USGS at the EROS Data Center

NHDPlus

An integrated suite of application-ready, geospatial, surface water data products

A national scale integration ofNational Hydrography Dataset (NHD)

1:100,000National Elevation Dataset (NED)

30 meter resolutionWatershed Boundaries Dataset (WBD)

1:24,000

4Contractor for the USGS at the EROS Data Center

National Hydrography Dataset Medium resolution (1:100,000) NHD used in NHDPlus development

5Contractor for the USGS at the EROS Data Center

National Elevation Dataset Used snapshot of 1-arcsecond (30 m) NED

http://ned.usgs.gov

6Contractor for the USGS at the EROS Data Center

Watershed Boundary Dataset

http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/

7Contractor for the USGS at the EROS Data Center

NHDPlus – What’s Inside?

NHD Feature Classes & Tables Greatly improved 1:100K National Hydrography Dataset

NED Elevation Grids (1-arc-second) Additional Components:

Stream Network Value Added Attributes (VAA) Flow Direction and Flow Accumulation Grids Elevation-based Reach Catchments Catchment Attributes

mean annual temperature & precipitation from prism % of each of the 21 land use classes from 1992 NLCD

Streamline Attributes min/max elevations slope mean annual flow estimates velocity

Cumulative Upstream Area Attributes for Every Grid Cell Network Locations of USGS Stream Gaging Stations

8Contractor for the USGS at the EROS Data Center

Network Locations of USGS Stream Gages

Gage ID: 09334500Station Name: White Canyon Near Hanksville, UTReach Code: 150004001602Drainage Area: 276 sq. mi.Maximum Flow: 1,370 cfsAverage Flow: 5.1 cfs

Plus other info from NWIS

9Contractor for the USGS at the EROS Data Center

Upstream trace above point of interest

10Contractor for the USGS at the EROS Data Center

11Contractor for the USGS at the EROS Data Center

Network Locations of USGS Stream Gages

12Contractor for the USGS at the EROS Data Center

Interactive drought index composition

Pick and choose among potential drought index location pointsGenerate tributary area

Pick and choose among stations and reservoirs in tributary area

Link to CUAHSI HIS observation data for stations and reservoirs

Calculate index and evaluate resultsIterate as desired

13Contractor for the USGS at the EROS Data Center

Questions?