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XP2D for Complex Flood Studies

 



Presenter: Sam Crampton, P.E., CFM
Senior Associate at Dewberry

SUMMARY

XP Solutions expert user, Sam Crampton, takes an in-depth look at the implementation of 2D modeling through the lens of two Case Studies: Rush Creek in Arlington, Texas, and a Coastal Plain Flood Study in Georgia. In the video, he looks at solving challenges in situations such as interconnected wetlands in a flat plain, diverging and converting channels, FEMA Zone A floodplains, breakout flows between a main channel and parallel flood relief channel, and complex hydraulic structures.

DETAILS

Rush Creek Flood Study, Arlington TX
The City of Arlington, TX selected Dewberry to develop a detailed 2-dimensional hydraulic model for the complicated lower section of the highly flood prone Rush Creek watershed. The model will help the city to more accurately identify flood risks and to support the assessment of mitigation solutions. Dewberry recommended the implementation of xpswmm/xp2D for this challenging project which contained complex multi-directional flooding, and numerous hydraulic structures.

Coastal Plain Flood Studies, GA
Dewberry recently performed floodplain studies for several hundred squares miles of the Georgia coastal plain geologic region which exhibits very flat terrain with numerous interconnected wetlands and very flat diverging and converging channels which make large scale 1-Dimensional modeling very impractical and far too expensive. The area was largely made up of vast areas of FEMA Zone A (approximate) floodplains. To address this challenge, Dewberry implemented xp2D’s rain on grid approach to model the rainfall runoff effects and route flows over the terrain to identify flood risks. XP provided a scalable solution that could be easily enhanced by adding 1D features such as culverts and channels where more model detailed was needed. The hydrologic results were compared with regional drainage area-discharge curves and proved to give valid results suitable for the application of FEMA Zone A floodplains studies.

 


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