CRWRFlood Map HECRAS Water surface profiles HECHMS Flood
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CRWR-Flood. Map HEC-RAS Water surface profiles HEC-HMS Flood discharge CRWR-Pre. Pro Av. RAS Arc. View Digital Elevation Model Arc. View Flood plain maps Digital Map Database
Waller Creek DEM
Waller Creek HMS Model
Flood Plain Mapping
HEC-RAS: Background l River Analysis System model of the U. S. Army Corps of Engineers l Input = cross-section geometry and flow rates l Output = flood water elevations Cross-Section Schematic
HEC-RAS: Cross-Section Description l Points describe channel and floodway geometry l Bank station locations l Water surface elevations and floodplain
3 -Dimensional River Channel Profile. Line Each point has (x, y, z) coordinates Cross. Section. Line
Connecting HMS and RAS
Discharge at a Particular Cross-Section
CRWR-Flood. Map HEC-RAS Water surface profiles HEC-HMS Flood discharge CRWR-Pre. Pro Av. RAS Arc. View Digital Elevation Model Arc. View Flood plain maps Digital Map Database
HEC-RAS: Output Graphical Text File
HEC-RAS: Data Translation l Data translation from HEC-RAS text file to dbase table l Bank and floodplain boundaries measured from stream centerline
Digital Stream Mapping l Digital orthophotograph and road coverage used as a base map l User digitizes stream with mouse l Boundary points define the RAS stream
Floodplain Mapping: Plan View
3 D Terrain Modeling: Procedure Outside Channel: Raster Inside Channel: Vector Result: TIN
3 D Terrain Modeling: Procedure l DEM raster to vector conversion l. Form a crosssection bounding polygon l. Intersect DEM points with bounding polygon and delete selected points
3 D Terrain Modeling
3 D Terrain Modeling
Floodplain Mapping: Plan View
Floodplain Mapping: Plan View
Animated Flood Map 2 -D View
Floodplain Mapping: 3 -D View
3 D Terrain Modeling: Ultimate Goal
Real-time flood emergency mapping Nexrad radar rainfall input Offline Flood hydrology analysis system Real time Precomputed flood map library