waste-water port; freeing port
Technical term for an outlet that discharges water from a dam, sewer, or ship's deck.
A large amount of water was released from the dam's waste-water port.
Seawater is drained from the ship's freeing port.
firefighting water outlet
Specifically an outlet for connecting fire hoses, often found in buildings or public facilities.
The fire brigade connected a hose to the building's water outlet.