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Floodplain Analysis Floodplain Analysis with ArcGIS Model with ArcGIS Model
BuilderBuilder
Donghyun RimDonghyun RimUniversity of Texas at AustinUniversity of Texas at Austin
What is floodplain and why What is floodplain and why is it important?is it important?
Floodplain - the lowland adjacent to a river, Floodplain - the lowland adjacent to a river, lake or ocean. lake or ocean.
Floodplains are designated by the frequency of Floodplains are designated by the frequency of the flood that is large enough to cover them.the flood that is large enough to cover them.
The National Flood Insurance Program has The National Flood Insurance Program has established a minimum standard of protection established a minimum standard of protection against the 100-year flood. against the 100-year flood.
Flood damage reduction – critical interestFlood damage reduction – critical interest
Work SiteWork Site
Austin
Waller Creek
Conceptual ProcessConceptual Process1.1. Rainfall input Rainfall input
2.2. Topologic dataset of the Topologic dataset of the watershed of Waller Creekwatershed of Waller Creek
3.3. Runoff Simulation by using Runoff Simulation by using HEC-HMSHEC-HMS
4.4. Calculation of water Calculation of water surface-elevations along the surface-elevations along the channel with HEC-RASchannel with HEC-RAS
5.5. Transformation of water-Transformation of water-surface elevation to a surface elevation to a unique inundation area unique inundation area known as flood plain known as flood plain
Marvelous Toolbox-Marvelous Toolbox-MAP2MAPMAP2MAP
Developed by Oscar Robayo
Rainfall Map to Flood Rainfall Map to Flood Inundation MapInundation Map
Import into Geodatabase
NEXRAD Rainfall Data
Transfer Data from NEXRAD Cell to
Subbasins
Export Timeseries of Rainfall to HEC-DSS HEC-HMS Streamflow
Hydrographs
Runoff Data (HEC-DSS) to
GIS HEC-RAS
Water Surface Elevation File
Import to GIS as XML Format
Convert WSE to WS TIN
Polygon as Inundated Area
Data CollectionData Collection
1. NEXRAD Rainfall Data 2. Topological Hydrography
3. HEC-HMS 4. HEC-RAS
5.DEM 6. Orthographic Photo6. Orthographic Photo
Creation of Compatible Creation of Compatible DataData
Result for Rosillo CreekResult for Rosillo Creek
Future WorkFuture Work
Use of 10 m cell DEM for delineation Use of 10 m cell DEM for delineation of Watershed.of Watershed.
Perform Map2Map run for Waller Perform Map2Map run for Waller Creek.Creek.
Use of rainfall for another time Use of rainfall for another time periodperiod
Special thanks toSpecial thanks to
Dr. MaidmentDr. Maidment Oscar RobayoOscar Robayo Laton CarrLaton Carr
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