Hinkley Point tide gauge site

The tide gauge building is located in "A" station at Hinkley Point nuclear power station. The pressure transducers are mounted on the caisson 500m off-shore.
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Tide gauge location

The GRP building houses the tide gauge equipment which consists of a POL DATARING data logger monitoring both of the full-tide pressure sensors. The sensors are mounted on a steel pole and are attached to the caisson cables running through the access tunnel connecting the sensors to the data logger.

The tide gauge is levelled to the tide gauge bench mark supported by Ordnance Survey auxiliary marks.

External users

Sea level pressures and/or elevations from this site are supplied to the following authority:

  • Environment Agency, South West Region

Site history

1990 – Tide gauge system installed
1991 – The pressure sensors were lifted and the blocked sensing nozzles were removed - a new type of nozzle was fitted
1993 – The pressure sensors were lifted, cleaned and replaced
1996 – The pressure sensors were lifted, cleaned and replaced
2006 – The pressure sensors were lifted, cleaned and replaced

Latitude51° 12.636'N
Longitude3° 7.878'W
Grid refST 2107 4632
Earliest data1990
Tidal levels
HAT13.02 m
LAT-0.19 m
MHWS11.83 m
MHWN8.91 m
MLWN3.59 m
MLWS0.92 m
H for 2024 12.93 m
L for 2024 -0.17 m
H for 2025 12.69 m
L for 2025 0.11 m
MSR10.91 m
MNR5.32 m

HAT – highest astronomical tide
LAT – lowest astronomical tide
MHWS – mean high water springs
MHWN – mean high water neaps
MLWN – mean low water neaps
MLWS – mean low water springs
H – highest for year
L – lowest for year
MSR – mean spring range
MNR – mean neap range

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