To make a drowning chamber for goblins in Dwarf Fortress, you must dig out an empty shaft above the intended flooding location. A 3 z-level shaft will quickly fill a room of a similar size. Once dug out, make some channels in the floor and install hatches over the holes. Connect those hatches to lever #1. A military drowning chamber can be a simple sally port (a secondary hallway leading into your fortress with bridges on both sides). Upon seeing the enemy, close down your main entrance while leaving the secondary open.
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