Absorption pits are used to receive drains from which source?

• A. Valve vault drains
• B. Roof runoff
• C. Stormwater
• D. Sewage lines

Answer: (A)

Absorption pits are used to receive drains from valve vaults. In a water distribution system, valve vaults can accumulate water from groundwater or during maintenance work. A drain from the valve vault is directed to an absorption pit so the water can percolate into the surrounding soil, keeping the vault dry and accessible and preventing pooling or frost-related issues. Roof runoff, stormwater, and sewage lines have their own designated drainage paths, so they aren’t routed into absorption pits.