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<p>Cities with weak drainage capacity often face serious urban flooding threats during extreme rainfall. However, systematic analyses of flood characteristics and street-level risks in such cities remain relatively limited in existing research. To systematically assess flood risks in cities with weak drainage systems, this study employs the Chicago rainfall hyetograph method to design precipitation scenarios with return periods of 0.5, 1, 2, 5, 10, and 20&#xa0;years for Yingjing County, Sichuan Province, China. The SWMM-LISFLOOD coupled model was employed to simulate rainfall-runoff processes and conduct sensitivity analyses. Node overflow, flood depth, flow velocity, and other relevant information were extracted and combined with the improved HR threshold method to assess flood risk. Results indicated that (1) As the return period increases, the percentage of overflow nodes increases from 11.61 to 44.95%, and the total amount of overflow soars from 3315 cubic meters to 99,415 cubic meters; (2) The maximum flood depth for the 20-year return period reached 1.57&#xa0;m, an increase of 141.54% compared to the 0.5-year return period; (3) At the 20-year return period, extremely high-risk and high-risk zones, constituting 33.3% of the total inundation area, are concentrated in the central and eastern study area and exhibit a high degree of spatial overlap with low-lying topography and high-density urban development. This study provides a scientific basis for optimizing drainage systems and developing disaster mitigation strategies in cities with a weak drainage system, thereby enhancing disaster resilience and regional economic stability.</p>

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Study on the spatial distribution of urban flooding and street flood risk in drainage-vulnerable city under extreme precipitation

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Yongkang Ma,
  • Yanmei Yang,
  • Zegen Wang,
  • Junnan Xiong,
  • Yinxiang Xu,
  • Jingtao Hao,
  • Jiahao Zhong,
  • Zhiwei Yong

摘要

Cities with weak drainage capacity often face serious urban flooding threats during extreme rainfall. However, systematic analyses of flood characteristics and street-level risks in such cities remain relatively limited in existing research. To systematically assess flood risks in cities with weak drainage systems, this study employs the Chicago rainfall hyetograph method to design precipitation scenarios with return periods of 0.5, 1, 2, 5, 10, and 20 years for Yingjing County, Sichuan Province, China. The SWMM-LISFLOOD coupled model was employed to simulate rainfall-runoff processes and conduct sensitivity analyses. Node overflow, flood depth, flow velocity, and other relevant information were extracted and combined with the improved HR threshold method to assess flood risk. Results indicated that (1) As the return period increases, the percentage of overflow nodes increases from 11.61 to 44.95%, and the total amount of overflow soars from 3315 cubic meters to 99,415 cubic meters; (2) The maximum flood depth for the 20-year return period reached 1.57 m, an increase of 141.54% compared to the 0.5-year return period; (3) At the 20-year return period, extremely high-risk and high-risk zones, constituting 33.3% of the total inundation area, are concentrated in the central and eastern study area and exhibit a high degree of spatial overlap with low-lying topography and high-density urban development. This study provides a scientific basis for optimizing drainage systems and developing disaster mitigation strategies in cities with a weak drainage system, thereby enhancing disaster resilience and regional economic stability.