Leixlip Water Treatment Plant

Client: Siac
Services: Temporary works design, supply and installation of ground support system

The new stand-alone €30 million water treatment facility will provide water treatment capacity of an additional 80 million litres of water per day for consumers in the Greater Dublin supply area, bringing overall production at Leixlip to 215 million litres per day. The Leixlip Plant is the second largest water treatment plant in the country and supplies approximately 30% of the Dublin Region’s drinking water requirements, supplying North Dublin City and County as well as parts of South County Dublin and Kildare.

Working for Siac, Trench Control designed and installed a large cofferdam in order to facilitate the construction of an aeration tank and other structures as part of the plant upgrade. The temporary works included sheet piling and internal bracing for a total excavation depth approaching 6.5m. The internal bracing comprised proprietary elements of cross struts and flying shores to mitigate lateral sheet pile movement. Driven piles where used to support the 37m span cross struts at midspan.