Permeable paving

Sustainable Urban Drainage Systems (SUDS) are increasingly being used to prevent run-off and flooding, and as a method of collecting and cleaning storm water.

The Hanson Formpave sustainable urban drainage system allows heavy rain to infiltrate through a permeable concrete block paved surface into a unique sub-base before being released in a controlled manner into sewers or water courses.

Increasing urbanisation and rapid run-off have put tremendous strain on conventional stormwater drainage systems. This has resulted in sewers and culverts becoming overloaded during periods of heavy rain and contamination of streams and rivers,

Heavy metals, hydrocarbons, rubber dust, silts and other detritus are all deposited on impermeable surfaces during dry weather. These are scoured off such surfaces during periods of heavy rain and transported at best, into expensive treatment works, or directly into rivers and streams where they cause severe environmental damage.

The solution is source control. The Formpave sustainable urban drainage system allows heavy rain to infiltrate through a permeable concrete block paved surface into a unique sub-base before being released in a controlled manner into sewers or water courses.

Discharge rates as low as 2.5 litres/hectare per second are easily achieved. Alternatively, the water can be infiltrated directly into the subgrade if the underlying subgrade is suitable.

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

Formpave’s sustainable urban drainage systems and Aquaflow permeable paving products are suitable for use on:

  • Car parks
  • Industrial estates
  • Retail centres
  • Pedestrian areas
  • Domestic drives
  • Motorway services
  • Airport service areas and aprons
  • Garages
  • Truck stops and other heavy duty applications.

Aquaflow blocks, the permeable paving blocks designed to be used with the Formpave sustainable urban drainage system, let through 2.5 litres/sec/m².

The basic systems are either infiltration or tanked. With infiltration the system is underlined with a pervious geotextile and is suitable for use where the water will infiltrate directly onto a suitable sub grade. The tanked system is underlaid by an impervious HDPE membrane and is suitable for use where the storm water will be attenuated before releasing it in a controlled manner, where the stormwater will be harvested for re-use or where difficult or contaminated sub grades are present.

Aquaflow paving blocks can be used with either the lined or infiltration systems. The blocks provide drainage through vertical channels ands will allow water through the surface at a rate of 9000mm per hour.

Experience has shown that total construction costs are lower than conventionally drained surfaces. When using the Formpave system, it is not necessary to incorporate the gullies, drainage pipes, drain runs, oil and silt traps and flow control mechanisms needed for traditional drainage.

Principal benefits of the sustainable urban drainage system:

  • Water re-harvesting and re-use – water can be re-used directly from the system for non-potable purposes such as flushing lavatories and watering plants.
  • Roof water can be discharged into the sub-base – design details for this are available in the technical brochure offered below.
  • Performance
  • Heavy duty use

If you need more information, request the comprehensive technical brochure offered below.

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