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AECOM analysis estimates billions in coastal storm risk for Naples; seawall elevation and freeboard options show positive benefit-costs
Summary
An AECOM business-case analysis presented to the council estimated large increases in coastal-storm property damage by 2070 under multiple sea-level scenarios, and found seawall elevation and residential freeboard options could deliver favorable benefit-cost ratios in some scenarios.
AECOM presented a city-funded “business case for resilience” at the Oct. 13 workshop, quantifying the potential cost of inaction from coastal storms, compound flooding and daily high tides, and modelling adaptation options including seawall elevation and building freeboard.
Annie DeBoer of AECOM said the team modelled existing, 2040 and 2070 hazard conditions using NOAA sea‑level curves and applied depth-damage functions to city parcel data, building replacement values and business interruption estimates. The analysis separated temporary event damages (coastal storms and compound rainfall-and-tide events) from long-term impacts due to daily tidal inundation where more than 25% of a building footprint was…
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