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Map-Based Hydrology and Hydraulics

Map-Based Hydrology and Hydraulics. ArcView Input Data DEM. ArcView Flood plain maps. CRWR-PrePro. Hec-GeoRAS. HEC-RAS Water surface profiles. HEC-HMS Flood discharge. Austin Digital Elevation Model. Waller Creek. Austin Watersheds. CRWR-PrePro. Digital Elevation Model

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Map-Based Hydrology and Hydraulics

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  1. Map-Based Hydrology and Hydraulics ArcView Input Data DEM ArcView Flood plain maps CRWR-PrePro Hec-GeoRAS HEC-RAS Water surface profiles HEC-HMS Flood discharge

  2. Austin Digital Elevation Model Waller Creek

  3. Austin Watersheds

  4. CRWR-PrePro Digital Elevation Model Stream Map ArcView-based preprocessor for HEC-Hydrologic Modeling System (HEC-HMS) Control point locations Soil and Land Use Maps HMS Basin File

  5. DEM Watersheds for Austin

  6. Selected Watersheds and Streams Mansfield Dam Colorado River

  7. HMS Schematic Prepared with CRWR-PrePro Mansfield Dam Colorado River

  8. HMS Model of the Austin Region

  9. HMS Results Watershed 155 Junction 44

  10. GIS-Based Flood Modeling • Terrain analysis using Digital Elevation Models • Flood hydrology model for the Austin region • Creating flood plain maps for Waller Creek • Real time flood emergency management

  11. Map-Based Hydrology and Hydraulics ArcView Input Data DEM ArcView Flood plain maps CRWR-PrePro AvRAS HEC-RAS Water surface profiles HEC-HMS Flood discharge

  12. Colorado River Network 1:100,000 scale Developed from EPA River Reach File 3 (the predecessor of the NHD)

  13. City of Austin Stream Network Developed from 1”=100’ Capco Areal photogrammetry 1:1200 scale

  14. Stream Definition: Waller Creek Austin Watersheds with Streamsderived from Aerial Photographs Streamlines generated by the aerial photographs are not always continuous.

  15. Information for Correcting Stream Network • DEM • Contours • Storm sewers • Orthophotos

  16. Resulting Corrected Stream • Subsequent steps: • Verification of corrected streams by flood hydrologists. • Running “tracer” program to connect arcs. • Burning of streams into DEM.

  17. Waller Creek HMS Model

  18. Flood Plain Mapping

  19. Connecting HMS and RAS

  20. Map-Based Hydrology and Hydraulics ArcView Input Data DEM ArcView Flood plain maps CRWR-PrePro AvRAS HEC-RAS Water surface profiles HEC-HMS Flood discharge

  21. HEC-RAS: Background • River Analysis System model of the U.S. Army Corps of Engineers • Input = cross-section geometry and flow rates • Output = flood water elevations Cross-Section Schematic

  22. Waller Creek Watersheds Network Channel

  23. HEC-RAS: Cross-Section Description • Points describe channel and floodway geometry • Bank station locations • Water surface elevations and floodplain boundaries

  24. Discharge at a Particular Cross-Section

  25. HEC-RAS: Output Graphical Text File

  26. Floodplain Mapping: Plan View

  27. 3D Terrain Modeling: Ultimate Goal

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