In cooperation with

Churchdown Surgery Gloucester

The village of Churchdown is prone to flooding. In 2007, Gloucestershire was hit by 78mm of rain in just 12 hours.

Gloucester, United Kingdom
NBG Cheltenham
Water capacity
138 m3


A closer look at this build-up at the Churchdown in Gloucestershire

Building on the initial design by the contract engineer Rutter Johnson, a mixed product solution was supplied by Polypipe that included a Permavoid system for use beneath a large permeable paving car park and two Polystorm tanks utilising anti- floatation measures in soft landscape areas.

The goal is to slow the flow of water into the sewer during periods of rainfall by detaining stormwater on-site.


Floot defence

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. Permavoid was also selected due to its high structural load capacity. 

To treat oil and capture silt, 35m of Permachannel, Permavoid Biomat and four Permaceptor separators were used to channel the collected stormwater away from the site and into local water networks.

Phil Williams, consultant engineer at EPG, said: By working with Polypipe’s technical experts, we were able to design a system that could be considered ‘good practice’ by the SuDS manual, local and national planning documents.”

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Permavoid source control ensures that no precious water goes to waste by catching, storing and reusing stormwater for irrigation, evaporation and infiltration. Find your local Permavoid distributor here to learn more about the technology and become part of the international movement.