Polypipe, the UK’s leading plastic piping systems manufacturer, has seen its popular Permavoid Podium Deck system specified as part of a large scale student accommodation project in East London.

Located near to the Olympic Park and adjacent to the Westfield shopping centre, Unite Students Stratford ONE project provides accommodation for over 1,000 students across 28 floors in the heart of the recently regenerated East London.

The project’s Main Contractor Westfield Construction and M&E Contractor, Dimension Data Advanced Infrastructure engaged with Polypipe to develop a practical rainwater attenuation system to manage the site’s stormwater drainage requirements in the event of a ‘1 in 100’ year + 30% storm event. The site had restricted external ground area to incorporate a large buried attenuation structure.

Working closely with design consultants the Environmental Protection Group (EPG), Polypipe supplied a two tiered Permavoid geocellular attenuation system at podium level to collect rainwater run off from both the building roof and podium level. The podium discharge was conveyed via flow control outlets into a small 30m3 buried attenuation tank constructed with Polypipe Polystorm geocellular units in order to attain the site discharge rate of 42l/s.

Consisting of lightweight, 85mm deep modular cells that can be interlocked to create a load supporting raft, Permavoid Podium Deck provides ideal first stage rainwater interception and source control that can be easily integrated into an overall SUDS solution. Having a 95% void ratio, Permavoid can collect and retain three times more water than aggregate sub-bases, making it ideal for projects where depths and loadings are a major consideration.

Glen Loftus from Dimension Data Advanced Infrastructure said: “Having to reconsider the drainage needs of the project during the build stage could have been an issue, however working with Polypipe and EPG on an appropriate podium level solution minimised disruption and went some way to making the project the success it was.”

Sean Robinson from Polypipe, explained: “Providing a compliant and cost effective stormwater attenuation scheme in built-up, urban areas is a real a challenge. Incorporating a Permavoid Podium Deck system into the scheme allowed the design process to begin at roof level.

“This project also highlighted the benefits of working with a manufacturer capable of supplying a range of modular components to provide site wide stormwater management solutions. The installation of the Permavoid Podium Deck system linking into the Polystorm tank ran smoothly, with our team able to deliver products to site in good time in order to keep the project on track.”

Work on the Unite Stratford ONE project completed in August, allowing the building to open for its first intake of students in September.

Date: 25 March 2015