A submersible dewatering pump is a type of pump designed to remove accumulated water from construction sites, mines, tunnels, and flooded areas. It operates while fully submerged in the fluid, making it suitable for continuous or temporary water removal tasks.

The pump consists of a sealed motor, impeller, casing, and discharge outlet. The motor is protected within a waterproof enclosure to prevent water ingress during operation. The impeller, driven by the motor, generates centrifugal force that lifts water through the pump and expels it through the outlet.

The design emphasizes portability and resistance to corrosion and abrasion. Many submersible dewatering pumps feature float switches or level sensors to enable automatic operation based on water levels. This enhances efficiency and reduces the need for constant supervision.

Submersible pumps are often used where water collects in low-lying areas or below-grade work zones. They can handle water with small solid particles, though the size and type of solids depend on the specific pump design.