The river control structure and locks are being replaced using a system of float in and placement of precast elements to form a high-quality underwater structure. A key element of the system is the formation of joints and seals between the elements.

For the control gate section of the structure, concrete base shells and pier shell caissons are precast, lifted and   positioned into place by a purpose made floating crane barge suitable for river use. Proserve designed, tested, and supplied appropriate grout bag systems.