Working closely with construction company, The Carey Group Plc, and international consultancy and construction company Mace, Polypipe's supply and install partner, SEL, undertook and evaluation of the site and its ground conditions. They recommended a Permavoid system to provide a shallow solution, due to the site being on Brownfield Land, having a high water table and a shallow outfall.
The shallow depth of the solution not only negated the need for pumping stations, it also reduced the need for temporary works, which in turn reduced the installation and labour costs as well as health and safety risks.
High strength Permavoid cells were combined with stretegically located Permachannel and Permavoid Biomat cells for the capture, treatment, storage and controlled discharge of rainwater at source.
Permachannel acts as both a surface water collection point and a treatment system that intercepts silt and oil with a zero gradient pavement level. Water is then discharged from the side of each Permachannel into Permavoid cells, complete with Permavoid Biomat and Permafilter for further treatment and storage, allowing only treated water to be discharged into the local watercourse.
The system incorporates a unique jointing mechanism that forms an interlocking 'raft' that will support structural loads across the most heavily trafficked areas, such as those found on the Coronation Street set.