Development of a Reliability Index Considering Flood Damage for Urban Drainage Systems

Eui Hoon Lee, Joong Hoon Kim

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Urban drainage systems are used to safely drain rainwater and prevent urban inundation, and their reliability is usually calculated from the probability of failure, which includes the probability of the drainage facilities being destroyed. This study proposes a new reliability index that includes three factors (flood volume, nodes, and damage), with the aim of prioritizing the structural and nonstructural measures required to improve urban drainage systems. In this study, synthetic rainfall data are generated by the Huff distribution and are used as input data for runoff simulations. The Distance Measure Method that uses a utopian approach is employed here to generate a dimensionless reliability index, as the three factors use different units and no definitive criteria currently exist to determine the weights that should be assigned to each factor. The reliability indexes of flood volume, nodes, and damage determined in this study are 0.7226, 0.4584 and 0.9750, respectively, as the three factors are weighted equally in the reliability index calculation. Using the new method, the reliability index of the city of Jeongup is 0.6484. The new reliability index can be used to assess the effectiveness of various flood mitigation measures in preparation for extreme rainfall events.

Original languageEnglish
Pages (from-to)1872-1880
Number of pages9
JournalKSCE Journal of Civil Engineering
Issue number4
Publication statusPublished - 2019 Apr 1

Bibliographical note

Funding Information:
This work was supported by a grant from The National Research Foundation (NRF) of Korea, funded by the Korean government (MSIP) (No. 2016R1A2A1A05005306).

Publisher Copyright:
© 2019, Korean Society of Civil Engineers.


  • distance measure method
  • flood damage
  • multi-dimensional flood damage analysis
  • reliability index
  • urban drainage systems

ASJC Scopus subject areas

  • Civil and Structural Engineering


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