What are the two basic lift station types described?

• A. Gravity-fed and pressure-dosed
• B. Wet pit-dry pit and wet pit-submersible
• C. Dry pit and wet well
• D. Submersible only

Answer: (B)

In lift station design, how the pump and its motor relate to the wastewater is the key difference. The two basic configurations described are a wet-pit (wet-well) setup paired with either a dry-pit arrangement or a submersible pump setup. In a dry-pit arrangement, the pump and motor sit in a dry chamber separate from or only lightly connected to the liquid, with seals on the shaft to keep wastewater out. In a wet-pit arrangement, the pump is located in the wastewater itself inside a wet well, and a submersible pump is designed to operate while submerged. These two describe the main ways engineers describe lift stations: one where the equipment isn’t submerged, and one where the equipment is submerged. Other options describe how the effluent is moved or claim a single type, which doesn’t capture the typical two-category distinction.