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Definition of Freeboard:
The height of the crest of a structure above the still water level.[1].
This is the common definition for Freeboard, other definitions can be discussed in the article

Note: a negative freeboard means that the crest of the structure is below the still water level.


  1. CIRIA (1996). Beach management manual. CIRIA Report 153.

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Stability of rubble mound breakwaters and shore revetments
Wave overtopping
Detached shore parallel breakwaters
Application of breakwaters