CATGAT

1. flood barrage gate: an opening gate used to control flood water.
2. caisson: a steel structure used for closing the entrance of locks, wet and dry docks. (IHO Dictionary, S-32, 5th Edition, 602)
3. lock gate: lock gates are the massive hinged doors at each end of a lock. (adapted from IHO Dictionary, S-32, 5th Edition, 2882)
4. dyke gate: an opening gate in a dyke.
5. sluice: A sliding gate or other contrivance the level of a body of water by controlling the flow into or out of it. (IHO Dictionary, S-32, 5th Edition, 4783)