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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 11 | Copyright
Nat. Hazards Earth Syst. Sci., 17, 1893-1906, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 13 Nov 2017

Research article | 13 Nov 2017

Economically optimal safety targets for interdependent flood defences in a graph-based approach with an efficient evaluation of expected annual damage estimates

Egidius Johanna Cassianus Dupuits1, Ferdinand Lennaert Machiel Diermanse2, and Matthijs Kok1 Egidius Johanna Cassianus Dupuits et al.
  • 1Delft University of Technology, Faculty of Civil Engineering and Geosciences, P.O. Box 5048, 2600 GA Delft, the Netherlands
  • 2Deltares Unit Inland Water Systems, Department of Flood Risk Management, P.O. Box 177, 2600 MH Delft, the Netherlands

Abstract. Flood defence systems can be seen as multiple interdependent flood defences. This paper advances an approach for finding an optimal configuration for flood defence systems based on an economic cost–benefit analysis with an arbitrary number of interdependent flood defences. The proposed approach is based on a graph algorithm and is, thanks to some beneficial properties of the application, able to represent large graphs with strongly reduced memory requirements. Furthermore, computational efficiency is achieved by delaying cost calculations until they are actually needed by the graph algorithm. This significantly reduces the required number of computationally expensive flood risk calculations. In this paper, we conduct a number of case studies to compare the optimal paths found by the proposed approach with the results of competing methods that generate identical results. The proposed approach is set up in a generic way and implements the shortest-path approach for optimising cost–benefit analyses of interdependent flood defences with computationally expensive flood risk calculations.

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Short summary
Flood defences, such as levees, emergency storage basins or storm surge barriers, can be designed as multiple lines of defence. If each line of defence has a number of possible levels, the total number of possible system configurations can be large. This paper presents an approach that is able to find an optimal configuration including future adaptations of such a flood defence system, based on an economic cost–benefit analysis.
Flood defences, such as levees, emergency storage basins or storm surge barriers, can be...