Well Point Dewatering System

A well point system comprises multiple well points strategically spaced along a trench or excavation site, all connected to a common header and powered by one or more well point pumps. Each well point assembly includes a well point, screen, riser pipe, and swing joint with tuning, typically installed by jetting. These assemblies facilitate water entry into the system by creating a partial vacuum, which is then pumped out through the header pipe.

Well point pumps consist of two pumps: one for pumping water from the header and another acting as a vacuum pump to remove air entering the system. Proper air control is essential to prevent cavitations, which can decrease pump efficiency. Advanced Land Drying pumps are specifically designed for dewatering purposes and are available in capacities ranging from 500 to 2000 gallons per minute.

Well point systems are often the most practical and cost-effective solution for dewatering construction sites where groundwater lowering needs are around 20 feet or less. However, the system can accommodate greater lifts by lowering the water in multiple stages. The 20-foot lift limitation is due to the difference in pressure between ambient air and the reduced pressure created by the pump.