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Rethinking rainwater harvesting for SuDS


Mark Manning of SDS discusses rainwater reuse in the context of SuDS regulations, and says that architects could be mistakenly rejecting such approaches as an important option for sustainable drainage


W


henever an architect receives a design commission that includes sustainable drainage, their


creative thoughts are likely to turn first to appealing blue/green infrastructure. But could a rainwater harvesting system be justified as part of the Sustainable Drainage System (SuDS)?


Even where there is limited space for above-ground SuDS ponds or swales, the opportunity for reuse is often missed. Why? Because our minds are set to view rainwater as a waste product to be discarded and quickly conveyed away. If someone throws paper, glass or recyclable plastic bottles onto the ground, we are enraged. Yet, all too often, we plan to let a valuable resource slip through our fingers.


Excess stormwater has become a nationwide waste problem; it causes flooding and sewage overflow pollution as it flows away into the overburdened drainage network and into our rivers.


SuDS design guidance Most architects know there is a design hierarchy to follow when selecting and specifying SuDS components. However, many guidance documents produced by Local Authorities and Water Companies either don’t include, or quickly demote, rainwater reuse. Instead, infiltration is frequently top of the list of methods to select from. In England, the Non-Statutory


Technical Standards (NSTs) for designing ADF JUNE 2021 WWW.ARCHITECTSDATAFILE.CO.UK


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