1. U.S. Department of the Interior U.S. Geological Survey Idaho District Office (208)387-1323 ahrea@usgs.gov Data Requirements for StreamStats December 18, 2002 Alan ReaPeter Steeves U.S Department of the Interior U.S. Geological Survey Massachusetts District Office (508)490-5054 psteeves@usgs.gov

2. National Streamstats GIS Data Components Datasets developed for the purpose of delineating accurate basin boundaries Datasets developed for determining basin characteristics Fixed stations and related data Basemap datasets

3. Flexible Approach with Standard Methods StreamStats is designed to be flexible in handling local data StreamStats will provide a set of standard definitions for basin characteristics Data must be in the ArcHydro data model, with a few extra naming requirements DEMs could be from any source or scale Users can add definitions/data as needed

4. Base Maps Whatever needed to locate points of interest Primarily 1:24,000 Digital Raster Graphics (DRG) NHD for reach-based locations Prefer National data sets

5. Approaches For Developing Basin Delineation Datasets EDNA (stage 1b) NHD Watershed preprocessing steps (http://nhd.usgs.gov)http://nhd.usgs.gov ArcHydro ‘Terrain Preprocessing’ steps from a DEM

6. Data Requirements—ArcHydro Tools Grids: Can be in a tiled data structure  Filled DEM (fil)  Flow Direction (fdr)  Flow Accumulation (fac – used to create str)  Streams (str) Vectors: ArcHydro data model  Catchments  AdjointCatchments  StreamLines Global data sets Globally Unique HydroID’s

7. Directory Structure

8. Terrain Preprocessing

9. Global Data Sets All in Global.mdb geodatabase hucpoly (tile boundaries) streams (network to connect tiles) hucpoints (outlets for tile polys)

10. Global Network

11. Building the Global Network Must build a Geometric Network of streams Just need mainstem streams needed to connect our data tiles (8-digit HUCs) Must specify a sink at outlet, compute flow directions

12. Geometric Network Wizard Build from existing features Use hucpoint and hucpoly feature classes Name network HUC_Net Build complex edges from streams feature class Use 2-m snap tolerance, both sets of features Include sources and sinks on hucpoints Do not assign weights

13. Set Flow Directions on Network Select outlet hucpoint Set Ancillary Role to Sink Click Set Flow Direction button on Utility Network Analyst Toolbar

14. Make Relationship Class HUCHasJunction

16. Store Area Outlets ArcHydro Tools Toolbar Attribute Tools pulldown

17. Preprocess Basin Characteristics ArcHydro Tools…Attribute Tools… Get Parameters Do this for each hucpoly polygon

18. Compact and Repair DataBase

19. National Streamstats GIS Data Components Datasets developed for the purpose of delineating accurate basin boundaries Datasets developed for determining basin characteristics Fixed stations and related data Basemap datasets

20. Approaches For Developing Basin Delineation Datasets EDNA (stage 1b) NHD Watershed preprocessing steps (http://nhd.usgs.gov)http://nhd.usgs.gov ArcHydro ‘Terrain Preprocessing’ steps from a DEM

22. Why take the EDNA (stage 1b) Approach? It is available for the project nationwide A good foundation dataset with minimal additional processing required May be the best option for states with limited resources

23. Why take the NHD Watershed Preprocessing Approach? Take advantage of higher quality local datasets (hi-res NHD, WBD) Better match with primary basemap (DRGs) Horizontal union of 3 primary physiographic datasets (elevation, basin boundaries, hydrography) Better match with NHD and WBD for spin-off applications

24. Determining the Best Option For Your State 3 National Datasets will guide States to determine best option:  NHD  WBD  NED