TY - JOUR
T1 - Defend or raise? Optimising flood risk reduction strategies
AU - Lendering, Kasper T.
AU - Jonkman, Sebastiaan N.
AU - van Ledden, Mathijs
AU - Vrijling, Johannes K.
PY - 2020
Y1 - 2020
N2 - Flood risk reduction can be provided by interventions such as raising land or constructing flood defences. This paper introduces an approach to optimise the selection of risk reduction strategies. It expands existing economic optimization approaches for flood defences, by introducing (largely) analytical formulations to include the effects of approaches to mitigate flood consequences. The method considers the size of the protected area and associated damages, the costs and dimensioning of interventions and the likelihood of flooding. It is applied in several practical cases. Within the context of this economic model, we conclude that a system of flood defences is more economical than a landfill for larger areas. Fills are preferred for small areas and/or for low costs. A combination of strategies is preferred when the value protected by the flood defence is low compared to the value protected by the fill, or when the high value development is relatively small in size. The sensitivity of outcomes to the choice of the main input parameters is presented, as well as implications of the results and selection of strategies in developing and developed countries. Overall, this approach supports decision makers in developing effective strategies to manage and reduce flood risk.
AB - Flood risk reduction can be provided by interventions such as raising land or constructing flood defences. This paper introduces an approach to optimise the selection of risk reduction strategies. It expands existing economic optimization approaches for flood defences, by introducing (largely) analytical formulations to include the effects of approaches to mitigate flood consequences. The method considers the size of the protected area and associated damages, the costs and dimensioning of interventions and the likelihood of flooding. It is applied in several practical cases. Within the context of this economic model, we conclude that a system of flood defences is more economical than a landfill for larger areas. Fills are preferred for small areas and/or for low costs. A combination of strategies is preferred when the value protected by the flood defence is low compared to the value protected by the fill, or when the high value development is relatively small in size. The sensitivity of outcomes to the choice of the main input parameters is presented, as well as implications of the results and selection of strategies in developing and developed countries. Overall, this approach supports decision makers in developing effective strategies to manage and reduce flood risk.
KW - flood management
KW - flood protection
KW - flood risk
KW - mitigation
KW - risk-based optimization
UR - http://www.scopus.com/inward/record.url?scp=85069717955&partnerID=8YFLogxK
U2 - 10.1111/jfr3.12553
DO - 10.1111/jfr3.12553
M3 - Article
AN - SCOPUS:85069717955
SN - 1753-318X
VL - 13
JO - Journal of Flood Risk Management
JF - Journal of Flood Risk Management
IS - S1
M1 - e12553
ER -