Gaving dock: the traditional form of dry dock. It is narrow basin, usually made of earthen berms and concrete, and closed by gates or by a caisson. When open, a vessel is floated in and the water pumped out, leaving the craft supported on blocks.
Drain pipe, water pipe.
Cloaca, a sewer.
Counter-drain: A drain run alongside of a canal or embanked waterway, to intercept and convey to a culvert or receptacle the water which may soak through.