A sump collects water that is building up underground so that it can be pumped away from a construction site or finished building. The source of water for a sump is normally groundwater, but waste water generated from appliances can also be routed to a sump.
Sumps are emptied by pumping their contents to a sewer network using a sump pump. Sumps are used in both trenchless and conventional construction projects and applications and can be used during the dewatering of a construction site.
Trenchlesspedia Explains Sump
A sump is built based on the risk of water affecting a construction project or finished building. Water that builds up against a basement wall causes damp and mold to damage the wall and give off odors. Sumps are, therefore, a protection mechanism to keep water away from buildings.
Automatic systems measure the level in the sump and activate a sump pump when the sump is full. The water is pumped into a sewer network. Clean water can be pumped to a storm water network, but contaminated water must be pumped to a waste water network.