Project Overview

As part of a multidisciplinary team, ATM conducted the coastal hazard assessment component of a coastal vulnerability assessment.

Services Rendered

  • Determine future 100-year coastal flood hazards due to anticipated sea level rise (SLR)
  • Site-specific coastal hazard modeling
  • Flood hazard maps


ATM estimated future coastal flood risks from increased storm surge elevations and wave heights at Atlantic Beach using SLR projections through site-specific modeling using FEMA’s Coastal Hazard Analysis and Mapping Program (CHAMP) Version 2.0 model suite.

The overall vulnerability assessment reflects forward-thinking modeling while adhering to FEMA methodology in projecting the likelihood of 100-year floods 25-, 50- and 100-years in the future. The assessment produced a series of flood maps, using this methodology but also calculating future SLR, which FEMA does not do. The net result is the City now has a new set of flood insurance rate maps that take into account SLR conditions. The data indicate that SLR will be 1.3 feet in 25 years; 2.9 feet in 50 years; and 7.0 feet in 100 years.


The Northeast Florida Regional Council (NEFRC) honored the City of Atlantic Beach with a Regional Award for its coastal vulnerability assessment.