Mean High Water

Mean High Water (MHW) is a Tidal Datum representing the average of all the daily tidal high water heights observed over a period of several years. In the United States this period spans 19 years and is referred to as the National Tidal Datum Epoch.[1] The most current MHW values are found in the North American Vertical Datum of 1988 (NAVD 88).

"MHW" redirects here. For other uses, see MHW (disambiguation).

See also
  • Chart datum – The level of water from which depths displayed on a nautical chart are measured

References
  1. "Tidal Datums". tidesandcurrents.noaa.gov.
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