In building architecture and civil engineering, a sump is a specialized lowest point, recessed basin, or collection pit engineered into a structure's foundation, basement floor, or plumbing layout to capture, accumulate, and temporarily hold unwanted water or liquid waste. By channeling fluids into this central depression, buildings can utilize automated pumps or gravity drainage systems to safely expel accumulated groundwater, sewage, or industrial runoff away from the property, preventing structural water damage and flooding.
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