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Post-Irma unmanned aircraft system (UAS) coastal storm impact surveys

BACKGROUND: Under the authority of Public Law (PL) 84-99, the U.S Army Corps of Engineers (USACE) Office of Homeland Security/ Emergency Management can use Flood Control and Coastal Emergencies (FCCE) funds to rehabilitate Coastal Storm Risk Management (CSRM) projects following major storms (33 USC §701n; 33 CFR Part 203). One criterion used to determine if rehabilitation is warranted under the PL 84-99 authority is the amount of fill volume lost, calculated by comparing preand post-storm topographic surfaces. Unfortunately, the prestorm surveys are often out of date (anywhere from months to years prior to the storm), and therefore the true impact of the storm cannot be separated from either natural variations in beach evolution, and/or the portion of the project designed to be sacrificial in nature. For example, the 2013 USACE Sandy Coastal Project Performance Evaluation Study (USACE 2013) highlights that many districts lack detailed, quantitative data before the storm to document and evaluate the performance of federal beach projects following extreme events1.