Alongside consulting engineers from the Environmental Protection Group (EPG) and civil engineer NGB Cheltenham, Polypipe Civils & Green Urbanisation [Polypipe CGU] were able to provide a solution that incorporated a shallow attenuation system – necessary due to a water table that left only 130mm of cover in large hard landscaped areas.
Building on an initial design by contract engineer Rutter Johnson, a mixed product solution - which included Permavoid for use beneath a large permeable paving car park and two Polystorm tanks utilising anti-floatation measures in soft landscaped areas – was supplied.
Due to the high water table, a 150mm deep system using 2,614 Permavoid cells delivered 138m³ of stormwater storage beneath the hard landscaping surface. The project also benefitted from Permavoid’s high structural load capacity.
Rosie Cheetham, Marketing Manager at Polypipe CGU, said: “This is a great example of a collaborative approach delivering a system that will serve a community for years to come. Our water management experts worked closely with all parties from the early stages of design process to develop and deliver a modern, intelligently engineered SuDS solution that was easy to install.”