What is the primary purpose of a sump pump in drainage systems?

The primary purpose of a sump pump in drainage systems is to remove accumulated water from a sump basin. Sump pumps are typically installed in the lowest part of a basement or crawl space to prevent flooding and manage groundwater levels. When water collects in the sump basin, the pump engages to expel the water away from the structure and into drainage systems or outside, thus protecting the foundation of the building and minimizing the risk of water damage.

This function is critical in areas prone to heavy rainfall or where the water table is high, as it ensures that water does not overwhelm the space, which could lead to issues like mold growth and structural integrity concerns. Other choices, while relevant to different aspects of drainage and water management, do not align with the specific role of a sump pump. For example, filtering pollutants is related to water quality management, not the primary action of a sump pump. Similarly, regulating water pressure is more relevant to plumbing systems, while preventing soil erosion involves different practices entirely.