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Mean low water

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Mean low water
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See: shoreline mean low water Tidal datum that is the arithmetic mean of the low water heights observed over a specific 19-year Metonic cycle (National Tidal Datum Epoch).

A vertical datum in which zero height is defined by a particular tidal surface, often mean sea level. Examples of tidal surfaces include mean sea level, mean low water springs, and mean lower low water.

See also: Trilateration, Traverse, Transit, Township, Equator