1. outfall pipe: a pipe (generally a sewer or drainage pipe) discharging in to the sea or a river.
  2. intake pipe: a pipe taking water from a river or other body of water, to drive a mill or supply a canal, waterworks, etc. (IHO Dictionary, S-32, 5th Edition, 2468)
  3. sewer: a pipe in a sewage system for carrying water or sewage to a disposal area.
  4. bubbler system: a submerged pipe from which warm water bubbles, preventing the surrounding water from freezing.
  5. supply pipe: a pipe used for supplying of gas or liquid product.