Mean Lower Low Water
The United States' National Oceanic and Atmospheric Administration uses mean lower low water (MLLW), which is the average height of the lowest tide recorded at a tide station each day during the recording period. MLLW is only a mean, so some tidal levels may be negative relative to MLLW.
Read more about this topic: Chart Datum
Famous quotes containing the word water:
“Reasoning with a drunkard is like
Going under water with a torch to seek for a drowning man.”
—Tiruvalluvar (c. 5th century A.D.)