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Hydrologic Study of the Sandies & Elm Watershed

Hydrologic Study of the Sandies & Elm Watershed. Jessica L. Watts. Sandies River. Elm River. Research Project Background. TCEQ TMDL Study Bacteria Low Dissolved Oxygen. Semester Project Overview. Objective:

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Hydrologic Study of the Sandies & Elm Watershed

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  1. Hydrologic Studyof the Sandies & Elm Watershed Jessica L. Watts

  2. Sandies River Elm River Research Project Background • TCEQ TMDL Study • Bacteria • Low Dissolved Oxygen

  3. Semester Project Overview Objective: To create an HSPF data model that simulates the gauging station flow for the years 2000 through 2004. Tasks: • Arc Hydro Watershed Delineation • Arc Hydro To HSPF • HSPF Forcing Data • Interpolation Comparison • HSPF Output Calibration

  4. Arc HydroWatershed Delineation

  5. Arc Hydro Input Requirements • Digital Elevation Model • Seamless ( http://seamless.usgs.gov/ ) • United States • 1/3” National Elevation Dataset • NHD Flowlines • USGS – National Hydrography Dataset ( http://nhd.usgs.gov/data.html ) • High Resolution

  6. Arc Hydro Subbasin Delineation Arc Hydro • Terrain Preprocessing • Watershed Processing • 35 Subbasins • (limited by HSPF)

  7. Arc Hydro to HSPF

  8. Arc Hydro to HSPF • Tools and Models have been built to convert information from Arc Hydro into the HSPF format. Arc Hydro To HSPF Models and Tools Created by Nate Johnson

  9. Subbasin Delineation • From Arc Hydro • Subwatershed • With unique HydroID for each area

  10. Drainage Lines • From Arc Hydro • Drainage Lines • With DrainID of DrainageLine = HydroID of Subbasin

  11. Land Use Shapefile • 1992 Land Use • Downloaded from Seamless • Used ArcGIS Tools • To Convert from Raster to a Polygon • To Clip Polygon into shape of Watershed

  12. Land Use Tables • Defines how each type of land use is treated in HSPF

  13. HSPF

  14. Forcing Data

  15. Precipitation Data • NCDC Daily Precipitation Data • Years 2000 through 2004

  16. Evaporation Data • NCDC Daily Evaporation Data • Years 2000 through 2004 Canyon Dam SeaWorld SAT Coleto Creek Res. Choke Canyon DAM Beeville 5 NE

  17. NEXRAD, August 27, 2001 Interpolation Comparison

  18. Data Interpolation Choices • Kriging • NEXRAD

  19. Data Interpolation Choices • IDW • NEXRAD When averaged over catchments there is a 61% average difference.

  20. Data Interpolation Choices • Spline - Regular • NEXRAD Negative Rain !! When averaged over catchments there is a 35% average difference.

  21. NCDC Monthly Data Arc GIS Zonal Statistics HSPF WDM File HSPF Forcing Data

  22. HSPFOutput & Calibration

  23. HSPF Output

  24. HSPF Output • Future Work • Calibration • Calibration • Calibration

  25. Thanks… Nate Johnson Jon Goodall Gil Strassberg Carrie Gibson And Dr. David Maidment Questions ?

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