Tidal Datum Description
Mean Low Tide (MLT)
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Tidal Datum Schematic
- Station Datum
- All water elevations are measured at each station relative to the Station Datum. Station Datum is an arbitrary zero point set low enough at each station such that the water level will never be below this point. The arbitrary number is designed to allow all water level observations to be positive numbers. Each station has its own unique Station Datum because of physical conditions at the station.
- A series of deep-driven-rod bench marks exist to maintain the station's zero point over time. If any of the benchmarks or the tide gage itself were to move, the water level measurements associated with that benchmark or tide gage could be adjusted accordingly to coincide with the readings of the others which did not move. In the figure below, station datum is labeled "STND" and is located at the bottom of the figure.