3. Drain Line: The drain line is the pipe system that removes wastewater from the building and transports it to the main sewer line or septic tank. 灰水:灰水是从淋浴和洗碗等活动中产生的废水,但不含污水。 20. Black Water: Blackwater is wastewater that contains sewage or fecal matter.
A drain is a pipe that serves only one building, conveying water and waste water away to a sewer. A lateral drain is a section of drain positioned outside the boundary of a building, connecting with the drains from other buildings to become a sewer.