Polypipe has supplied a vital attenuation solution to one of the UK’s busiest railway stations, London Bridge, as part of the Thameslink redevelopment programme.

After working closely with main contractor Costain and consultant Hyder WSP, Polypipe’s design and product support team designed, delivered and oversaw the installation of a two-legged Ridgistorm-XL large diameter attenuation tank capable of storing 68m3 of water.

Located under a car parking facility at London Bridge station, the system comprises of Polypipe’s Ridgistorm-XL pipes and fittings in 1500mm diameters, along with a Stormcheck vortex flow controller within a 1500mm chamber to safely release water from the tank at a rate of no more than 70l/s in the event of extreme rainfall events.

Polypipe’s technical and product support team also worked closely with the end client to ensure that any necessary design changes were met for a quick and easy installation. The team’s ability to retro fit and undertake additional modifications to the attenuation tank and chambers whilst in situ went a great way to ensuring a speedy and safe installation.


Steve Bourne, Public Health Engineer at WSP, said:

Working with Polypipe gave us access to their technical support and enabled us to utilise their in-house manufacturing facility to create something unique that met the projects needs exactly.

“Rather than providing a ‘one size fits all solution’, Polypipe was able to produce a modularised design that included pipes in bespoke lengths, which ensured ease of handling and installation.

Russell Belleguelle, Rail Project Manager at Polypipe Civils added:

The versatile and high strength Ridgistorm-XL system doesn’t just offer a seamless integration with link drains, culverts, catchpits and manholes to form a single solution – but is also much lighter in weight than equivalent concrete products – making them easier to transport to site and install. We are delighted to add London Bridge Station to our portfolio of rail experience.

Date: 24 April 2015