Gulf Coast Low Water Datum (Gclwd)
Gulf Coast Low Water Datum (Gclwd) : A tidal datum. Used as chart datum from November 14, 1977, to November 27, 1980, for the coastal waters of the Gulf coast of the United States. GCLWD is defined as mean lower low water when the type of tide is mixed and mean low water (now mean lower low water) when the type of tide is diurnal. See: National Tidal Datum Convention of 1980
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