In the 1931 earthquake a tsunami hit the river mouth, leaving fish up to 15 metres above the high tide level.
32.
At West Quay in Bridgwater where the river is tidal the highest astronomical tide level is above ordnance datum ( AOD ).
33.
It used a system of pulleys and wires to automatically calculate predicted tide levels for a set period at a particular location.
34.
It is also known as the intertidal zone because it is the area where tide level affects the conditions of the region.
35.
This allows vehicular access at all tide levels for the first time, although the road on Sanday is still covered by high tides.
36.
Iris was expected to bring a storm surge of 13-18 feet ( 4-5 meters ) above normal tide levels and large battering waves.
37.
In The Fens, water from the surrounding higher land is carried across the land which lies below high tide level, in embanked rivers.
38.
The site was attractive because of the wide average-range between low and high tide levels, with a maximum perigean spring tide range of.
39.
The caissons are linked by a concrete structure at approximately low tide level which accommodates the machinery room and bearings for the lifting span.
40.
Iris was expected to bring a storm surge of 13 feet-18 feet ( 4-5 meters ) above normal tide levels and large battering waves.
