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Floodplain Analysis with ArcGIS Model Builder. Donghyun Rim University of Texas at Austin. What is floodplain and why is it important?. Floodplain - the lowland adjacent to a river, lake or ocean.   Floodplains are designated by the frequency of the flood that is large enough to cover them.

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Floodplain Analysis with ArcGIS Model Builder


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floodplain analysis with arcgis model builder

Floodplain Analysis with ArcGIS Model Builder

Donghyun Rim

University of Texas at Austin

what is floodplain and why is it important
What is floodplain and why is it important?
  • Floodplain - the lowland adjacent to a river, lake or ocean.  
  • Floodplains are designated by the frequency of the flood that is large enough to cover them.
  • The National Flood Insurance Program has established a minimum standard of protection against the 100-year flood.
  • Flood damage reduction – critical interest
work site
Work Site

Austin

Waller Creek

conceptual process
Conceptual Process
  • Rainfall input
  • Topologic dataset of the watershed of Waller Creek
  • Runoff Simulation by using HEC-HMS
  • Calculation of water surface-elevations along the channel with HEC-RAS
  • Transformation of water-surface elevation to a unique inundation area known as flood plain
marvelous toolbox map2map
Marvelous Toolbox-MAP2MAP

Developed by Oscar Robayo

rainfall map to flood inundation map
Rainfall Map to Flood Inundation Map

Transfer Data from NEXRAD Cell to Subbasins

NEXRAD Rainfall Data

Import into Geodatabase

Export Timeseries of Rainfall to HEC-DSS

Streamflow Hydrographs

HEC-HMS

Runoff Data (HEC-DSS) to GIS

Water Surface Elevation File

HEC-RAS

Polygon as Inundated Area

Convert WSE to WS TIN

Import to GIS as XML Format

data collection
Data Collection

1. NEXRAD Rainfall Data

2. Topological Hydrography

slide8

3. HEC-HMS

4. HEC-RAS

slide9

5.DEM

6. Orthographic Photo

future work
Future Work
  • Use of 10 m cell DEM for delineation of Watershed.
  • Perform Map2Map run for Waller Creek.
  • Use of rainfall for another time period
special thanks to
Special thanks to
  • Dr. Maidment
  • Oscar Robayo
  • Laton Carr