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Communicating (nature-based) flood-mitigation schemes using flood-excess volume

Abstract : As interest mounts in nature-based solutions (NBS) for flood mitigation as complementary options to civil-engineering measures, possible flood-protection strategies have become more diverse and hence complicated to assess. We offer a straightforward and educational protocol targeted for effectiveness analysis and decision making involving stakeholder participation. It is based on the concept of flood-excess volume (FEV), the volume exceeding a threshold and generating flood damage, and explores what fraction of FEV is reduced, and at what cost, by particular flood-mitigation measures. Quantification and interpretation of cost scenarios are facilitated using a graphical display that is easy to understand and encapsulates concepts of flood magnitude, FEV and protection-measures efficacy. It is exemplified for two recent extreme-flood events on the River Calder in Mytholmroyd (Yorkshire, United Kingdom) and the River Brague in Biot (Alpes-Maritimes, France). Each case has different flood-mitigation measures such as natural water-retention measures, tree planting, river-bed widening, or use of reservoirs and floods walls. Our straightforward protocol enables fast, quantifiable and easy-to-understand exploration of protection strategies using multiple measures, and in doing so highlights the issue of NBS scalability.
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https://hal.inrae.fr/hal-02610267
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Submitted on : Saturday, May 16, 2020 - 7:24:45 PM
Last modification on : Tuesday, September 7, 2021 - 3:54:53 PM

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O. Bokhove, M.A. Kelmanson, T. Kent, Guillaume Piton, J.M. Tacnet. Communicating (nature-based) flood-mitigation schemes using flood-excess volume. River Research and Applications, Wiley, 2019, 35 (9), pp.1402-1414. ⟨10.1002/rra.3507⟩. ⟨hal-02610267⟩

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