Deep Well Pumps for Construction Dewatering

When a foundation pit or basement goes below the water table, the groundwater has to be lowered before digging can continue. Deep well dewatering does this with a ring of wells around the excavation, each with a submersible pump, drawing the water level down below the bottom of the pit.

How the pumps are chosen

• Well diameter decides the series: 100QJ for 100 mm wells, 150QJ for 150 mm, and so on
• Flow per well comes from the dewatering design, which depends on the soil and the depth to be lowered
• Head covers the lift from the drawn-down level plus the discharge to the drain or settling tank

Conditions that are harder than a water supply well

• New wells often carry sand at first, which wears pumps; develop the wells before long runs
• Levels fall as the dewatering works, so check the pump inlet stays at least 1 m under water
• Pumps run day and night for weeks; keep spares on site and log the current of each pump
• Cables run across a busy site and must be protected

Send us the number of wells, the well diameter, the design flow and the depths, and we will propose the pumps and cables.