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CRWR-FloodMap

ArcView Digital Elevation Model. ArcView Flood plain maps. HEC-RAS Water surface profiles. HEC-HMS Flood discharge. CRWR-FloodMap. CRWR-PrePro. AvRAS. Digital Map Database. Waller Creek DEM. Waller Creek HMS Model. Flood Plain Mapping. HEC-RAS: Background.

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CRWR-FloodMap

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  1. ArcView Digital Elevation Model ArcView Flood plain maps HEC-RAS Water surface profiles HEC-HMS Flood discharge CRWR-FloodMap CRWR-PrePro AvRAS Digital Map Database

  2. Waller Creek DEM

  3. Waller Creek HMS Model

  4. Flood Plain Mapping

  5. 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

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

  7. 3-Dimensional River Channel ProfileLine Each point has (x,y,z) coordinates CrossSectionLine

  8. Connecting HMS and RAS

  9. Discharge at a Particular Cross-Section

  10. ArcView Digital Elevation Model ArcView Flood plain maps HEC-RAS Water surface profiles HEC-HMS Flood discharge CRWR-FloodMap CRWR-PrePro AvRAS Digital Map Database

  11. HEC-RAS: Output Graphical Text File

  12. HEC-RAS: Data Translation • Data translation from HEC-RAS text file to dbase table • Bank and floodplain boundaries measured from stream centerline

  13. Digital Stream Mapping • Digital orthophotograph and road coverage used as a base map • User digitizes stream with mouse • Boundary points define the RAS stream

  14. Floodplain Mapping: Plan View

  15. 3D Terrain Modeling: Procedure Outside Channel: Raster Inside Channel: Vector Result: TIN

  16. 3D Terrain Modeling: Procedure DEM raster to vector conversion Form a cross-section bounding polygon Intersect DEM points with bounding polygonand delete selected points

  17. 3D Terrain Modeling

  18. 3D Terrain Modeling

  19. Floodplain Mapping: Plan View

  20. Floodplain Mapping: Plan View

  21. Animated Flood Map 2-D View

  22. Floodplain Mapping: 3-D View

  23. 3D Terrain Modeling: Ultimate Goal

  24. Real-time flood emergency mapping Nexrad radar rainfall input Real time Precomputed flood map library Offline Flood hydrology analysis system

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