Sanitary Sewers are defined as which?

• A. Closed system, waste
• B. Open system, storm water
• C. Mixed system, both waste and storm
• D. Unsealed system, waste

Answer: (A)

Sanitary sewers are designed as a closed piping system that carries wastewater from homes and businesses to a wastewater treatment facility, separate from rainwater. That’s why the description “closed system, waste” fits best: it emphasizes both the sealed nature of the network and its purpose of transporting sewage and other wastewater.

The other ideas describe different drainage setups. An open system would involve exposed channels, which sanitary sewers are not. Storm water refers to rain runoff managed by its own system, not the sewer that carries waste. A mixed or combined system carries both waste and stormwater in the same pipes, which is not the sanitary sewer. An unsealed system would allow leaks and exposure, which would defeat the purpose of a sanitary sewer.