Future 100-Year Flood Elevation Map Project for Broward County, Florida
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The goal of the project is to establish a baseline for future resiliency for Broward County, Florida buildings and infrastructure to prepare for projected sea level rise and climate-change induced hydrological changes. The overall result will be reducing flood risk for development and re-development, while increasing the sustainability of structures over their lifespan. The future 100-year flood elevation map will be incorporated into county code. Leveraging the results of the 100-year flood mapping, the county will establish new regulatory criteria for setting finished floor elevations for development and re-development throughout the county.

Geosyntec's Scope of Services

The first focus of the project is developing an updated current condition county-wide flood model using U.S. Federal Emergency Management Agency (FEMA) approved MIKE SHE and MIKE 11 modeling. This modeling integrates both groundwater flow and spatially distributed surface hydrology connected to primary conveyance systems. The model covers the urbanized areas of Broward County, including 30 municipalities, 21 water control districts, and facilities managed by the South Florida Water Management District. Using future projections of sea level rise, corresponding changes to groundwater levels, as well as projected changes in rainfall durations and intensity, a future conditions 100-year flood model will be developed to provide a new regulatory flood elevation map.

The scope of work includes a detailed review of the county's current FEMA Community Rating System (CRS) score to determine areas where this project could help increase their ranking, which would result in additional flood insurance premium discounts for county citizens. Significant stakeholder involvement, including formal public information events and one-on-one meetings, was needed to garner support from the municipalities and water control districts as well as to solicit input and data for refining the model. Several GIS-based model data tools are also being developed to facilitate adjustments in the future modeling scenarios based on changes to future condition projections.

Beyond establishing regulatory elevations throughout the county based on future conditions, the model will also be used by stakeholders after the project to evaluate secondary drainage issues, provide a baseline for water management planning, and support the development of long term capital projects for water resources, transportation, and utilities.

Notable Accomplishments

This county-wide integrated modeling effort is the first of its kind in Florida to represent the impacts from future climate change and leverage that data to set county-wide regulatory standards

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Project Summary

  • Location: Broward County, Florida
  • Client: Broward County
  • Project Practice Areas: Environmental Management
  • Type of Facility: Resiliency and Adaptation
  • Services Provided: Resiliency and Adaptation Assessment, Flood Elevation Mapping, Integrated Surface Water and Groundwater Modeling of Sea Level Rise Impacts, Future Hydrological Analysis, FEMA Community Rating System Evaluation, GIS Based Data Management Tools
  • Type of Work: Future 100-Year Flood Elevation Map
  • Governing Regulation: State and Federal Regulations