Harwich tide gauge site
The tide gauge housing is located on the Harwich Haven Authority jetty.
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Tide gauge location
The GRP cabinet houses the tide gauge equipment which consists of a POL data logger and a three-channel bubbler system. The pressure points are fixed to a pile beneath the cabinet.
The tide gauge is levelled to the tide gauge bench mark supported by Ordnance Survey auxiliary marks.
External users
There are currently no external users.
Site history
2004 – Tide gauge station established
| Location | |
| Latitude | 51° 56.88'N |
| Longitude | 1° 17.526'E |
| Grid ref | TM 2634 3284 |
| Earliest data | 2004 |
| Tidal levels | |
| HAT | 4.60 m |
| LAT | -0.11 m |
| MHWS | 4.15 m |
| MHWN | 3.34 m |
| MLWN | 1.12 m |
| MLWS | 0.45 m |
| H for 2024 | 4.51 m |
| L for 2024 | -0.10 m |
| H for 2025 | 4.43 m |
| L for 2025 | -0.06 m |
| MSR | 3.7 m |
| MNR | 2.22 m |
Abbreviations
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
Measurement devices
Tide gauge systemsFull-tide bubbler
Half-tide bubbler
Direct pressure transducer
Tide gauges
Ott pneumatic gauge
Munro float gauge
Wellhead float gauge
Lea float gauge
Instruments
DATARING logger
Datum probe