ABSTRACT

Guidance for Flood Risk Analysis and Mapping: Coastal Wave Runup and Overtopping   [open pdf - 1MB]

From the Overview and Purpose: "Wave runup and overtopping are complex physical processes occurring in the surf and backshore zones. They depend on the local water level, incident wave conditions, and the nature of the beach or structure encountered. In narrow developed coastal floodplains, the process of high velocity wave runup and overtopping puts residential and non-residential structures located above the storm surge levels along the shorelines at an increased flood risk. In these floodplains, wave runup elevations and overtopping rates determine 1-percent-annual-chance Base Flood Elevations (BFEs) as well as flood zone designations and spatial extents of the Special Flood Hazard Area (SFHA). This guidance document presents the physical processes and theory behind the analysis of wave runup and overtopping. This document also provides a framework for evaluating different methodologies and the considerations and best practices for each method when performing FEMA coastal flood hazard studies in different physical settings."

Report Number:
Guidance Document 89
Publisher:
Date:
2018-02
Series:
Copyright:
Public Domain
Retrieved From:
U.S. Federal Emergency Management Agency: https://www.fema.gov/
Format:
pdf
Media Type:
application/pdf
URL:
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