Filling the lock through culverts eliminated that problem, as well as putting the lock gate below the breast wall.
2.
Lock 27 is a curious combination of the two specifications, having the culverts inside the masonry, but the upper gate below the breast wall.
3.
The 1830 design eliminated the use of culverts in the masonry, and the upper gate is "'below "'the breast wall.
4.
Having the wickets in the gates, particularly if the gates are above the breast wall, means that the water pouring in could swamp some boats in the lock.
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