(MLW) - A tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch. For stations with shorter series, simultaneous observational comparisons are made with a c [..]

The average level of low water at a place over a 19-year period.

The average height of all of the low waters recorded at a given place over a 19-year period. Mean Sea Level

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 observation [..]

The average height of all low waters at a place over a 19-year period.

The average height of the low waters over a 19-year period. For shorter periods of observation, corrections are applied to eliminate known variations and reduce the result to the equivalent of a mean [..]

The average height of the low tides over a 19-year period.

Also expressed as MLW, the average height in a given area of the low water tide based on historical records for that area. This is usually the datum point from which depths are calculated on a chart or in navigational pubulications.

Mean of all low waters at a place when observed during a lunation of 29 days.

A figure representing the average low tide of a region.

Lowest average level water reaches on an outgoing tide.

A figure representing the average low tide of a region.

The average height of the daily low tides recorded over a 19-year period at a specific location.

(MLW) - A tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch. For stations with shorter series, simultaneous observational comparisons are made with a control tide station in order to derive the equivalent datum of the National Tidal Datum Epoch.

The average height of the low water over a 19-year period. For shorter periods of observations, corrections are applied to eliminate known variations and reduce the results to the equivalent of a mean [..]