It was 0.6 mi long, and had a single lock where it joined the river that was 108by14 ft, with a depth of 3.75 ft over the lower cill.
Built in 1959, it is 150 m long, 14 m wide, 8 m ditch depth, with cill water depth of 2.5 m.
It has a width of 20.5 m, a length of 180 m and cill depth of 5 m.
It would be 105 ft long, and the cill would be 22.5 ft below the highest tide level.
In some locks, there is a piece of oak about 9in cm thick which protects the solid part of the lock cill.
The edge of the cill is usually curved, protruding less in the centre than at the edges.
The levels in the two reservoirs were six inches and four inches, respectively, below the overflow cills.
For instance, the level of cill is to a large extent the best technical guess that can be made.
