Last edited 31 Aug 2020


Overtopping is: ‘The passage of water over a component such as a floodbank or seawall, due to wave action. Overtopping does not necessarily represent ‘failure’ of a flood defence to perform its function.’

Ref Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019.

See also: Overflowing.

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