Last edited 12 Aug 2020


Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines freeboard as: ‘An allowance for uncertainty in design water level and any other physical processes that may affect the ability of an asset to withstand the design water level such as wave action or superelevation.’

See also Residual uncertainty allowance.

Containment systems for the prevention of pollution, Secondary, tertiary and other measures for industrial and commercial premises (CIRIA C736), published by CIRIA in 2014 defines freeboard as: ‘An allowance in the form of increased height of a containment wall for additional capacity over and above the minimum design requirement.’

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