mean high water Tidal datum that is the arithmetic mean of the high water heights observed over a specific 19-year Metonic cycle (National Tidal Datum Epoch).
The shoreline of tidal waters will be mapped to represent the mean high water line (mean high tide level) ...
must know the minimum clearance between the masthead and the obstruction, which will occur at high tide. Consequently, bridge clearances etc are given relative to a datum based on high tide, such as Highest Astronomical Tide or Mean High Water ...
 See also: Tide, Surface, Elevation, Mapping, High water
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