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Glossary Cartography / Term

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). For stations with shorter series, simultaneous observations are made with a primary control tide station to derive the equivalent of a 19-year value. Use of "mean low tide" is discouraged.

Permanent link Mean Low Water - Modification date 2020-01-22 - Creation date 2020-01-22


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