Permeable Paving Systems

Formpave have designed a range of Aquaflow paving blocks which when laid over a large area directly allows rainwater to permeate into a tanked attenuation or soakaway system before being released in a controlled manner into sewers or water courses. Discharge rates of 2.5 litres/hectare per second are easily achieved. Alternatively if the underlying geology is suitable, the water can be infiltrated directly into the sub-grade.

All of the Aquaflow blocks and slabs provide drainage through vertical channels and will allow water through the surface at a rate of approximately 9000mm per hour (9000 litres per m² per hour).

The water leaving the Formpave system can be cleaned by filtration and microbialaction and can be used for secondary non-potable uses such as flushing toilets and watering soft landscapings.

A further advantage of the system is that roof water can be drained directly into the sub-base via a roddable sump, or if siphonically drained, through a dispersion chamber.