90 LANDSCAPING & EXTERNAL WORKS
HOUSEBUILDERS WILL NEED TO LOOK AT THE MATERIALS THAT ARE USED FOR LANDSCAPING AND AT THE LAYOUT OF ESTATES TO FIND WAYS TO MINIMISE AND MANAGE THE WORST EFFECTS OF EXTREME HEAT
The research demonstrated that the permeable paving systems which were looked at were more effective in removing pollution from rainwater run-off than attenuation tanks. The same research also showed that permeable pavements can remove a wider range of pollutants than oil separators.
COOL & CLEAN
In addition to managing the weather, permeable paving systems can assist in reducing the harmful pollutants that leave large paving areas exposed during extreme heat. Research conducted in 2004 by the Construction Industry Research and Information Association has shown that permeable pavements can remove between 60% and 95% of suspended solids and up to 90% of hydrocarbons.
This means that permeable paving effectively cleans the water as it goes through the system. Tyre residue on road surfaces causes a considerable amount of plastic pollution which can end up in the drainage system along with hydrocar- bons, detritus, silts, and microplastics. All of these pollutants can be captured by permeable paving.
Larger particles are stopped at the surface, while fi ner materials, hydrocar bons and heavy metals are trapped as they penetrate the supporting layers. Organic materials, once trapped, break
down over time, reducing the amount of contaminants that reach watercourses. The result is that the water which
infi ltrates into the ground or is drained to the next stage of a water management system is of a considerably higher quality than if using an impermeable surface, relying on attenuation tanks. With more extreme weather during all seasons expected to be the trend for UK climate over the coming decades, housebuilders and developers can turn to concrete block permeable paving as a useful tool to keep the carriageways, pathways and driveways of their estates cooler during extreme heat, productive in storing rainwater during heavy downpours and practical in assisting with the fi ltration of pollutants.
Jamie Gledhill is engineering technical manager at Brett Landscaping
WWW.HBDONLINE.CO.UK
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