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Cost-effective adaptation strategies to rising river flood risk in Europe

Author

Listed:
  • Francesco Dottori

    (European Commission, Joint Research Centre (JRC)
    CIMA Research Foundation)

  • Lorenzo Mentaschi

    (European Commission, Joint Research Centre (JRC)
    University of Bologna, Department of Physics and Astronomy ‘Augusto Righi’ (DIFA))

  • Alessandra Bianchi

    (FINCONS SPA)

  • Lorenzo Alfieri

    (CIMA Research Foundation)

  • Luc Feyen

    (European Commission, Joint Research Centre (JRC))

Abstract

River flood risk in Europe could rise to unprecedented levels due to global warming and continued development in flood-prone areas. Here, we appraise the potential of four key adaptation strategies to reduce flood risk across Europe based on flood risk modelling and cost–benefit analysis. We find that reducing flood peaks using detention areas is economically the most attractive option. In a scenario without climate mitigation (3 °C global warming), they can lower projected flood losses in Europe by 2100 from €44(30–61) billion to €8.1(5.5–10.7) billion per year and lower population exposed by 84% (75–90%) or achieve a risk level comparable to today. The economic investment required over 2020–2100 would provide a return of €4(3.5–6.3) for each €1 invested. The risk reduction potential of strengthening of dykes is somewhat lower, at 70% (59–83%) for a comparable annual investment. Implementing building-based flood proofing and relocation measures is less cost-effective but can reduce impacts in localized areas.

Suggested Citation

  • Francesco Dottori & Lorenzo Mentaschi & Alessandra Bianchi & Lorenzo Alfieri & Luc Feyen, 2023. "Cost-effective adaptation strategies to rising river flood risk in Europe," Nature Climate Change, Nature, vol. 13(2), pages 196-202, February.
    • Handle: RePEc:nat:natcli:v:13:y:2023:i:2:d:10.1038_s41558-022-01540-0
    DOI: 10.1038/s41558-022-01540-0
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