LANDSCAPING & EXTERNAL WORKS


97


Polypipe provides flood alleviation for retrofit scheme at ‘lost’ London river


flooding from west London’s combined sewers has seen Polypipe’s Permavoid system used to create two unique shallow stormwater drainage systems that are sensitive to their environment. A third scheme will begin this autumn using Polypipe’s Permavoid system to complete the project. The project, overseen by Thames Water in partnership with the London Borough of Hammersmith and Fulham and the Royal Borough of Kensington and Chelsea, will see SuDS solutions retrofitted into a highly urbanised area, in order to potentially mitigate the risk of surface water flooding during periods of heavy rainfall across the Counters Creek catchment area. In order to assess the varied approaches SuDS can offer, the project saw three scheme sites identified where a number of differing


A


n ambitious pilot scheme designed to combine engineered and soft SuDS solutions to alleviate the risk of


surface water management systems could be utilised in combination with their surroundings. The three ‘typical’ London streets selected met Thames Water’s criteria of being hydraulically discrete and having suitable monitoring points to measure the system’s effectiveness. The SuDS pilot scheme retrofitted in the


three streets of the two boroughs will limit, as far as possible, the volume and rate at which surface water enters the public sewer system. Monitoring performance in the three streets should provide evidence to show whether these systems provide a viable solu- tion that could be applied across a wider area. Polypipe’s Permavoid geocellular system


was used to create part of an engineered stormwater solution for each of the selected locations: Mendora Road in Fulham, Melina Road in Shepherd’s Bush and Arundel Gardens in Kensington. These three separate solutions have been developed with specific


focus on their particular environment. The retrofitted SuDS scheme at Arundel Gardens in the Royal Borough of Kensington and Chelsea will be built this autumn in collabo- ration with the council and their contractors. The third further environmentally sensitive


system design incorporated as part of the pilot project will see Permavoid installed beneath the road surface of Arundel Gardens, with the established magnolia trees on each side of the road benefitting from a passive watering system that uses some of the stored rainwater from within the attenuation crates.


01709 770000 www.polypipe.com/wms


ADF FEBRUARY 2017


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