Definitions for "Mean low water"
Keywords:  tide, datum, tidal, epoch, metonic
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.
average height of the low waters over a 19-year period; water level is computed the same as for mean high water
Lowest average level water reaches on an outgoing tide.
Keywords:  moyenne, mar, basse
" Marée basse moyenne"