1. CRWR-FloodMap ArcView Digital Elevation Model HEC-HMS Flood discharge HEC-RAS Water surface profiles ArcView Flood plain maps CRWR-PreProAvRAS 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. Points describe channel and floodway geometry Bank station locations Water surface elevations and floodplain boundaries HEC-RAS: Cross-Section Description

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

8. Connecting HMS and RAS

9. Discharge at a Particular Cross-Section

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

11. HEC-RAS: Output Text File Graphical

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

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

14. Floodplain Mapping: Plan View

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

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

17. 3D Terrain Modeling

19. Floodplain Mapping: Plan View

21. Animated Flood Map 2-D ViewView

22. Floodplain Mapping: 3-D ViewView

23. 3D Terrain Modeling: Ultimate Goal

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