Crisis level
Groynes in coastal engineering (CIRIA C793), published by CIRIA in 2020, defines the crisis level or crisis threshold as: ‘The level at which the function being monitored, such as the stability of the beach and/or any backing structures (seawall/promenade), could be compromised and emergency remedial action becomes necessary. An example would be, in the case described under alarm level/threshold above where it has been predetermined that an extreme event could result in 5 m of recession, that the beach crest recedes to within 4 m of an asset that requires protection.’
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