Future 100 Year Flood Map for Coastal Resiliency in Broward County
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As part of Broward County's efforts to build coastal resilience and address the impacts of climate change, especially sea level rise, the Broward County Board of County Commissioners approved the creation of a Future Conditions Map Series in the Broward County Code of Ordinances.

The first map of the series – Future Conditions Average Wet Season Groundwater Elevation Map – was approved in July 2017 and establishes antecedent conditions for application in surface water permitting of all major redevelopment and new development projects. The map ensures drainage systems will function under conditions of additional sea level rise and more intense rainfall predicted through 2060 - 2069, decreasing future flood risk. The second map of the series – Future Conditions 100-year Flood Elevation Map – currently under development – will establish minimum finish flood elevations, under the same 2060-2069 seal level rise scenario, and a selected future 100-year rainfall event.

The presentation will discuss the leveraging of a County-wide integrated hydrological, hydraulic, and groundwater flow model to develop the future conditions 100-year flood map product. Stakeholder contributions to the model development, coastal considerations, and model calibration will be summarized. The efforts to develop extreme future rainfall scenarios for the study will be discussed including the expanded analysis of a varied set of downscaled rainfall datasets, including CORDEX, COAPS, BCCA, LOCA, Raw GCMs and Jupiter WRF, with the goal of reducing associated uncertainties in determining future rainfall through a super-ensemble approach.

This project breaks new ground in coastal resiliency by addressing future risk head on. The results of the study may provide guidelines for other coastal communities to likewise advance technical approaches to support addressing future uncertainty and implementing modernized design standards.

Publication Summary

  • Geosyntec Authors: Mark Ellard
  • All Authors: Mark Ellard,Geosyntec Consultants; Carolina Maran, Broward County Environmental Protection and Growth Management Department
  • Title: 33rd Annual National Conference on Beach Preservation Technology
  • Event or Publication: Event
  • Practice Areas: Groundwater Assessment and Remediation
  • Citation: Mark Ellard, P.E., CFM, D.WRE (Florida) will present "Future 100 Year Flood Map for Coastal Resiliency in Broward County" at the 33rd Annual National Conference on Beach Preservation Technology at the Hyatt Sarasota in Sarasota, Florida at 11:20 a.m. on February 7.
  • Date: February 7, 2020
  • Location: Sarasota, Florida
  • Publication Type: Platform Presentation