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A method to identify the weakest link in urban drainage systems.

Didrik Meijer1, Hans Korving2, Jeroen Langeveld3

  • 1Deltares, Boussinesqweg 1, 2629 HV Delft, Postbus 177 2600 MH, Delft, The Netherlands E-mail: didrik.meijer@deltares.nl; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands.

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A new graph-based method analyzes urban drainage systems efficiently. It reveals climate change impacts, significantly increasing storm sewer flooding frequency and extent by 50%.

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Area of Science:

  • Environmental Engineering
  • Urban Hydrology
  • Climate Change Adaptation

Background:

  • Urban drainage system performance relies on subsystem storage and discharge capacities.
  • System performance can degrade due to aging, urbanization, and climate change impacts.
  • Traditional hydrodynamic models are computationally intensive for long-term analysis.

Purpose of the Study:

  • To introduce a computationally efficient method for analyzing urban drainage systems.
  • To assess the impact of aging and climate change on urban flood extent and frequency.
  • To compare the novel method's results with traditional hydrodynamic models.

Main Methods:

  • Development of the graph-based weakest link method (GBWLM).
  • Application of graph theory's flow path analysis, replacing complex hydrodynamic simulations.
  • Analysis of multi-decade rainfall series and climate change scenarios.

Main Results:

  • GBWLM provides results comparable to hydrodynamic models.
  • Increased rainfall intensity (approx. 20%) due to climate change has minimal impact on gully pot and surface water flooding.
  • A 50% increase in storm sewer flood frequency and expanded flood extent are projected.

Conclusions:

  • GBWLM is a feasible and accurate tool for analyzing urban drainage system performance over long periods.
  • Climate change poses a significant risk to urban storm sewer systems, increasing flood frequency and extent.
  • Effective adaptation strategies are crucial for mitigating climate change-induced urban flooding.