In wastewater collection terminology, which term is synonymous with a holding tank?

• A. Manhole
• B. Wet well
• C. Septic tank
• D. Basin

Answer: (B)

The concept being tested is the specific vocabulary used for storage in a wastewater collection system. A holding tank in this context is a space that temporarily stores incoming wastewater before it’s pumped onward. The term that matches this function in typical sewer infrastructure is the wet well. It’s the underground chamber at a pumping station where wastewater collects and sits until a pump moves it to the next treatment stage, so the holding-tank-like role is inherent.

Other options don’t fit as well because a manhole is just an access point to the sewer, not a storage space. A septic tank is part of on-site disposal systems, not the central collection network. A basin can refer to various large storage or treatment areas, but in standard wastewater collection terminology, the specific term for a holding tank prior to pumping is wet well.