Natural Flood Management (NFM) is gaining increased traction in mainstream flood and coastal risk management practice, yet many practitioners remain uncertain about the efficacy of NFM techniques and the methodological approach that should be adopted at scheme appraisal stage. Drawing upon evidence from the Blackbrook initiative in Saint Helens, Merseyside, an approach is outlined that address what volumes of water need to be held in the landscape by Runoff Attenuation Features (RAFs) for various probability events, from the 1:5 to 1:1,000 AEP.
Primary data is presented on the first catchment intervention, four Engineered Log Jams (ELJs), a type of RAF, which have considerable sediment trapping efficiency and water quality improvement affects. Alongside the physical science data, the social dimension of NFM is explored: principally how do you engage a wider partnership of organisations across all sectors to recognise there is a problem and mobilise them in delivering a solution themselves. The delivery of NFM as a catchment based approach requires parallel effort on the social and physical dimensions. The Mersey Forest has always been acutely aware of the need for holistic science and partnership work, having existed for over 25 years and having planted over 9 million trees through partnership.Back to all speakers