LLWLTLower Low Water Large Tide
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Lower Low Water Large Tide (LLWLT) is the lowest expected tide at 0.5 m Chart Datum and Higher High Water Large Tide (HHWLT), the highest expected tide, is 11.6 m above Chart Datum (CHS, 2001).
LNT--Lowest Normal Tide--in present usage it is synonymous with LLWLT, but on older charts it may refer to a variety of low water chart datums--it is also called Chart Datum (CD), a most important term of reference.