Coastal engineers present detailed wave analysis for flood-proofing projects

The City of Clearwater's Building/Flood Board of Adjustment & Appeals meeting on May 6, 2025, focused on critical discussions regarding flood zone designations and wave height analysis for local properties. The meeting highlighted the importance of understanding the different flood zones, specifically the VE and AE zones, which are determined by wave heights during storm events.

During the meeting, a representative explained the distinctions between the coastal high hazard VE area, which experiences waves greater than three feet, and the AE zone, where waves range from one and a half to three feet. The discussion emphasized the significance of the liminal line, which marks the boundary for these zones. Properties located landward of this line are subject to lower wave heights, specifically less than one and a half feet.

The board reviewed a wave height analysis conducted by Humiston and Moore engineers, which indicated that the majority of the properties in question are situated in areas with predicted wave heights of 0.9 feet or less during a 100-year storm event, according to FEMA criteria. This analysis utilized a numerical model developed by the Army Corps of Engineers and incorporated detailed elevation data collected via LIDAR technology.

The findings were presented through a color-coded map illustrating the wave heights, with blue and light blue areas indicating waves of less than one foot. The analysis aims to support the proposed dry flood-proofing measures for the structures under consideration.

In conclusion, the meeting underscored the importance of accurate flood zone mapping and wave analysis in guiding local development and ensuring safety against potential flooding events. The board's next steps will likely involve further review of the wave analysis and its implications for future construction and flood management strategies in Clearwater.