Recording of water levels is often needed to relate other activities to a particular tidal state.
In particular they are used to reduce bathymetric depth data to the required height datum.
Typical instruments utilised by WES are illustrated below.
The Hydrosphere ‘HydroTide’ vented pressure sensor and logger pictured below is the instrument of choice at harbour or jetty installations.
Alternatively this Coastal Leasing ‘MacroTide’ autonomous pressure sensor and logger can be deployed offshore in a seabed frame for several months at a time.
Supplementary board/step gauges surveyed into the required height datum are often employed to calibrate the recording instruments.