What type of building drainage system removes wastewater but not stormwater?

A sanitary drainage system is specifically designed to transport wastewater from areas such as sinks, toilets, and other plumbing fixtures to a treatment facility or sewer system. This system is essential for maintaining hygiene and preventing the spread of pathogens, as it handles water that has been contaminated through human use.

The distinction between sanitary drainage systems and other types, like storm drainage systems, is significant. While storm drainage systems are meant to manage surface runoff and prevent flooding by directing rainwater or melted snow to appropriate drainage areas, they do not handle wastewater from toilets or sinks. Combined drainage systems, which are a mix of both sanitary and storm systems, can convey both types of water but are not singularly focused on just wastewater removal. Graywater systems deal specifically with the reuse of water from sources like showers and sinks but do not handle black water that comes from toilets.

Thus, a sanitary drainage system is the appropriate choice for transporting only wastewater, underscoring its unique role in plumbing and wastewater management.