outfall n : the outlet of a river or drain or other source of water
- The place where water exits a storm drain.
An outfall is the discharge point of a waste stream into a body of water; alternatively it may be the outlet of a river, drain or a sewer where it discharges into the sea, a lake or the like.
A wastewater treatment system discharges treated effluent to a water body from an outfall. An ocean outfall may be conveyed several miles offshore, to discharge by nozzles at the end of a spreader or T-shaped structure. Outfalls may also be constructed as an outfall tunnels or subsea tunnels and discharge effluent to the ocean via one or more risers with nozzles.