Which term describes the line that discharges wastewater to an outfall?

• A. Outfall Line
• B. Gravity Main
• C. Inverted Siphons
• D. Grease Traps

Answer: (A)

In wastewater systems, the line that carries sewage to the discharge point is called the outfall line. This term identifies the pipe whose purpose is to deliver effluent to the outfall—the point where wastewater leaves the sewer system and enters a treatment facility or receiving water. The gravity main refers to a broad gravity-fed sewer, not specifically the line to the outfall. Inverted siphons describe a pipe that goes under an obstacle by dipping below the invert and using pressure differences, not merely the discharge path to the outfall. Grease traps are separate treatment devices that remove fats, oils, and grease before the wastewater enters the sewer. So the outfall line best fits the described function.