Accuracy evaluation of 2D inundation analysis results of simplified SWMM according to sewer network scale

Jung Hwan Lee, Seong gyu Kang, Gi Moon Yuk, Young Il Moon

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Constructing a reliable runoff model and reducing model runtime are important in research of real-time urban flood forecasting to reduce the repetitive flood damage. Sewer networks in the major urban basin such as Seoul are vast and complex so that it is not suitable for real-time urban flood forecasting. Therefore, the rainfall-runoff model should be simplified. However, the runoff results due to the simplification of sewer networks can vary depending on the subjectivity and simplification method of the researcher and there is a significant difference especially in 2-D inundation analysis. In this study, the sewer networks in various urban basins with different numbers and distributions of sewer networks were simplified to certain criteria. The accuracy of the simplification model according to the sewer network scale is evaluated by 2-D inundation analysis. The runoff models of Gwanak, Sillim, and Dorimcheon, frequently inundated basins were simplified based on four simplification ranges due to the cumulative drainage area set as a criterion for calculating the simplification range. This study will be expected that the inundation result of simplification models estimated through the analysis can contribute to the construction of a reasonable and accurate runoff model suitable for real-time flood forecasting.

Original languageEnglish
Pages (from-to)531-543
Number of pages13
JournalJournal of Korea Water Resources Association
Issue number8
StatePublished - Aug 2019


  • Real-time urban flood forecasting
  • SWMM
  • Sewer network simplification


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