Polypipe, manufacturer of engineered sustainable drainage solutions, has seen its popular Ridgistorm-XL large diameter piping system installed as part of a water management attenuation solution for residential developers Kensington Developments.
Situated in the village of Marton, near Blackpool, the Magnolia Point development consists of 45 detached and 38 semi-detached three and four bedroom new family homes.
Due to the layout of the site, there was a limited public open space available to install a suitable attenuation system capable of storing the required stormwater for the development. Polypipe was approached to review the initial site drainage plan and worked alongside Consultant Engineer, Elluc Projects Ltd to design an alternative solution to meet the needs of both a 1 in 30 and 1 in 100 year storm events under Section 104 agreement.
The selected system was required to fit within an area of 1.25km² and store 680m² of stormwater. In order to meet these requirements Elluc Projects Ltd specified an attenuation tank formed of 482m of Ridgistorm-XL 1200mm diameter SN2 pipe and fittings. Polypipe was able to take into account the site conditions in order to engineer the Ridgistorm-XL system to exact structural calculations. These calculations ensured that the Ridgistorm-XL system was designed to accommodate vehicles onsite, both during the backfilling and post installation.
The modularised system boasted 17 pipe runs as well as 20 prefabricated fittings, including 17 1200mm 90 degree bends, C and F sections, as well as 3 1800mm RIDGISTORMAccess Manholes. The system was connected together with sealing rings, the simplest jointing method which does not require welding, helping to save time during the installation.
Manufactured in Polypipe’s in-house specialist facility, the Ridgistorm-XL system was delivered to site in ready-to-install modular units, allow for easy handling, whilst reducing the need for heavy plant and minimising time and installation cost.
Richard Fox, Quantity Surveyor at Kensington Developments, said: “It was of paramount importance that the attenuation system used could be designed to fit into our limited available footprint. Polypipe’s pre-fabrication facilities meant that the system was designed and delivered to fit. The pre-fabricated fittings also assisted for a speedier installation, and reduced health and safety risks on site.”
Vikki Woodhouse, WMS Residential Manager at Polypipe Civils, said: “We have vast experience in providing water management solutions. The Ridgistorm-XL attenuation tank needed to be designed to fit within the limited space available and so Polypipe’s technical experts were on-hand to advise on the design from the beginning of the project. We were given a very unique project and designed a fully engineered system, taking all of Kensington Development’s requirements into consideration providing expert stormwater for the site.”
The installation of the Ridgistorm-XL attenuation system was completed in September 2015.