tidal datum

tidal datum

[′tīd·əl ′dad·əm]
(oceanography)
A level of the sea, defined by some phase of the tide, from which water depths and heights of tide are reckoned. Also known as tidal datum plane.
References in periodicals archive ?
The Americans take MHW as the average of all the High Water heights observed over the National Tidal Datum Epoch.
The average of the Higher High Water height on all tidal days observed during a tidal datum epoch.
The average of the Lower Low Water height of all tidal days during the tidal datum epoch.
The average of the Lower Low Water height on all tidal days observed during a tidal datum epoch.