1. Floodplain Analysis with ArcGIS Model Builder
Donghyun Rim
University of Texas at Austin

2. 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

3. Work Site
Austin
Waller Creek

4. 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

5. Marvelous Toolbox-MAP2MAP
Developed by Oscar Robayo

6. 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

7. Data Collection
1. NEXRAD Rainfall Data
2. Topological Hydrography

8. 3. HEC-HMS
4. HEC-RAS

9. 5.DEM
6. Orthographic Photo

10. Creation of Compatible Data

11. Result for Rosillo Creek

12. 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

13. Special thanks to
Dr. Maidment
Oscar Robayo
Laton Carr