An ambitious new project to dramatically reduce the amount of storm water entering the combined sewer network was launched last summer by Thames Water.
The project will be the biggest sustainable urban drainage system (SuDS) in the UK and has been developed through an innovative partnership between Thames Water and Nine Elms Vauxhall. Once complete, the £14 million scheme will free up more capacity for the large planned developments and help reduce discharges into the River Thames during storm conditions.
Rainwater landing on an area the size of 20 football pitches will be channelled back into the Thames to stop it entering the capital’s overstretched sewers, where it would mix with raw sewage. This is will reduce flood risks and save a huge amount of energy and cost involved in treating rainwater after it combines with waste water.
Main framework contractor to Thames Water, eight2O which is a Costain Atkins JV, has designed and is delivering the project. Included in the Nine Elms Battersea to Vauxhall scheme, designed to capture and channel rainwater via a number of above ground SuDS features, is a 250 metre run of large diameter precast concrete pipes beneath the new Nine Elms Park. After heavy rainfall, the excess surface water will be channelled via the pipe network to an upgraded pumping station on the Ponton Road and from here directly into the Thames.
After considering a number of storm water drainage design options, the team at eight2O opted for FP McCann’s DN2100 large diameter reinforced concrete pipes. The pipes manufactured at FP McCann’s precast concrete works in Knockloughrim, Northern Ireland were delivered on a just-in-time schedule and installed by Kent based specialist drainage civil engineer Davey Civils.
Commenting on the project, Chris Luck, eight2O’s Construction Manager on the Nine Elms Growth and SuDS Scheme says, “By keeping rainfall out of the combined sewers, the project is designed to reduce the risk of flooding, pollution and pressure on the waste water network. After considering alternative pipe systems and taking into account the difficult ground conditions, the use of FP McCann’s DN 2100 precast concrete pipes for this integrated SuDS and storm water management system was considered by far the best option”.
The unique drainage network will interact with a variety of eco-friendly rainwater design features included in new developments across Nine Elms. These include green roofs, swales, ditches containing vegetation used to remove pollutants and streets with rainwater gardens, which allow water to evaporate into the atmosphere, irrigate plants and generally reduce the volume of rainwater flowing back into the river.
For GB drainage enquiries, please contact our Ellistown sales team on 01530 240000, or contact our Knockloughrim sales tem for Scottish/NI enquiries on 028 7954 9026. You can also email us at firstname.lastname@example.org.