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RAINWATER MANAGEMENT


ENGINEERED SUDS IS KEY TO FLOOD MANAGEMENT


BMJ talks to Brett Martin about the need to re-address the way we build homes to limit our exposure to flooding risks.


W


etter winters are becoming the norm in the UK making our towns and cities vulnerable to the devastating impact that


flooding can have on people’s lives. Failure to prepare for these events will come at a cost which is why we need to consider how we build new homes to address this risk. Sustainable Drainage Systems (SuDS) offer developers and housebuilders a way to manage excess stormwater on their developments. uilding on flood plains and urbanising our green spaces has a knock-on effect as we have less land for rainfall to be able to soak away into the ground. It’s imperative that water is managed where it falls, reducing the demand on built drainage and the sewerage infrastructure. Planning guidance requires all major new housing developments of 10 houses or more to incorporate SuDS for the management of surface water run-off. However this doesn’t apply to smaller developments or the retrofitting of SuDS in urban environments.


Managing water where it falls By taking a SuDS approach to managing water, housebuilders and developers can manage the risk of surface flooding, integrating these solutions into developments, whilst at the same


January 2019 www.buildersmerchantsjournal.net 23


time influencing other aspects of the site and reducing impermeable areas wherever possible. Sustainable drainage mimics natural drainage processes by allowing rainfall to soak into the ground where possible or by delaying discharges. Reducing both the volume and rate of surface water run-off to sewers and watercourses, this helps to improve water quality, ecology and amenity value of


watercourses. It is important, however, to remember that there is no single drainage solution for any one site.


There are a number of options from natural above ground SuDS solutions including swales, detention ponds, basins and permeable surfaces, to engineered solutions such as


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