This project re-visit after 17-years continuous use assesses the long-term performance of permeable paving and its important benefits for urban trees. It was one of three older projects where field tests were undertaken by an Interpave member which demonstrated that, despite receiving no specific maintenance to improve permeability, concrete block permeable paving still provided infiltration rates that would cope with any likely UK rainfall event.

The Martlesham project was also the subject of a video showing the trials and an illuminating interview with the original project designer about maintenance and also the benefits of permeable paving to irrigate trees. Retaining and introducing trees, and other green infrastructure, within our towns and cities is now a key planning requirement. As permeable paving allows the same pattern of run-off transfer to the ground as natural vegetation, it allows water to reach tree and shrub roots, despite providing a hard surface above.

A new case study is available here.