Last edited 18 May 2021

Mean sea level

Groynes in coastal engineering (CIRIA C793), published by CIRIA in 2020, defines mean sea level as the: ‘Average height of the sea surface over a 19-year period.’

It defines mean high water as: ‘The average of all high waters observed over a sufficiently long period.’

And mean low water as: ‘The average of all low waters observed over a sufficiently long period.’

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