Caisson Dewatering in Lehigh River, PA

As part of a multi-year bridge construction project over the Lehigh River in north central Pennsylvania, we created a dewatering system so foundation work could be done for the bridge piers. The environmentally friendly plan was engineered to control sediment when discharging water from the caisson.

We designed the system with diesel generators, submersible
pumps, and a series of four-inch hoses tied into the pumps and
connected to the manifolds to discharge the water downstream.

Included in the final system were:

• Four Atlas Copco QAS45 generators
• Eight Atlas Copco D50N submersible pumps (two per generator)
• An automated lag pump operating off a float system
• Fused HDPE pipe and assembled manifolds for discharge

The project began in October 2024 and is expected to take four
years to complete.