Sustainable Drainage Systems (SuDS) and Resin Bound Surfacing

Sustainable drainage systems (SuDS) are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage systems work by slowing water run off from a site, allowing natural processes to break down pollutants.  Water draining through SuDS compliant paving may be allowed to flow naturally to groundwater or diverted to a soakaway when natural drainage is poor, as in heavy clay soils, or diverted to a rainwater harvesting storage tank and used for irrigation, car washing etc.  Permeable paving reduces surface water run-off and the risk of flooding, reduces the risk of sewer flooding during heavy rain and recharges groundwater to help prevent drought, all important elements of SuDS. RonaDeck Resin Bound Surfacing and RonaDeck EcoPath UV are paving products suitable for use where a fully permeable construction is required; the polyurethane resin used to bind the aggregate in both products is UV stable, ensuring that the resin will not yellow or darken.  RonaDeck Resin Bound Surfacing is applied to a solid base and may be used for car parks, driveways, footpaths, terraces, patios, swimming pool surrounds and other light vehicle traffic or pedestrian traffic areas.  RonaDeck EcoPath UV is suitable for pedestrian traffic and may be applied directly to a Type 3 aggregate base.

The depth of construction required for permeable pavement will vary according to predicted traffic conditions, the type of base to be laid and how well the subsoil drains.  Heavy clay soils may require laying of pipes to divert water draining through the construction to existing the drainage, a soakaway or a rainwater harvesting system.  The use of a waterproof membrane is typical in such cases, applied before laying of pipes and Type 3 aggregate sub-base.  It may be necessary for a capping layer to be applied to the sub-grade if the soil is too soft.  Information about minimum depths and the constituents of permeable pavement construction for car parks, driveways and footpaths can be found in the RonaDeck Resin Bound Surfacing technical data sheet, the following is a typical build-up.

Surfacing

RonaDeck Resin Bound Surfacing

Base Course

AC14 open graded asphalt concrete maximum 70/100 pen binder to BS EN 13108-1.

Or

No-fines concrete

Granular Sub-base

Well compacted Type 3 granular sub-base or similar approved

Optional Impermeable Membrane

Impermeable membrane for use when a storage system is to be installed

Or

Geotextile Layer

Geotextile layer to prevent upward migration of soil

Capping Layer

If required, depending on sub-grade condition