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  11. Hydrologic Performance Assessment Of Low Impact Development Facilities Based On Monitoring Data And Swmm Modeling In An Urban Catchment In Taiwan

Hydrologic performance assessment of low impact development facilities based on monitoring data and SWMM modeling in an urban catchment in Taiwan

Yu-Jia Chiu1,2, Lo-Chen Chang3, Yu-Te Lin3

  • 1Department of Harbor and River Engineering, National Taiwan Ocean University, No.2, Beining Rd., Zhongzheng Dist, Keelung City, 202301, Taiwan R.O.C.. yjchiu@mail.ntou.edu.tw.

Scientific Reports
|July 27, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Low-impact Development (LID) significantly reduces urban runoff and flooding risks, cutting peak flow by 90%. Scaling up LID infrastructure is crucial for urban resilience against extreme rainfall.

Area of Science:

  • Environmental Engineering
  • Urban Hydrology
  • Climate Change Adaptation

Background:

  • Urban stormwater systems face increasing strain from impervious surfaces and climate change-driven extreme precipitation.
  • Low-impact Development (LID) offers a sustainable strategy to mitigate these impacts on urban water management.
  • Taiwan's Taoyuan Water Recycling Center represents a pioneering large-scale, integrated LID installation.

Purpose of the Study:

  • To assess the performance of integrated LID strategies at Taiwan's Taoyuan Water Recycling Center.
  • To quantify the effectiveness of bioretention cells, permeable pavements, and green roofs in managing stormwater runoff.
  • To identify key factors influencing LID performance in urban catchments.

Main Methods:

  • Utilized the Storm Water Management Model (SWMM) for hydrological simulations.
Keywords:
LIDPeak delay timePeak flow reductionTotal runoff reduction rate

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  • Calibrated the SWMM model using field data from 2021-2024.
  • Analyzed six sub-catchments under 24 synthetic storm scenarios to evaluate LID effectiveness.

    • Main Results:

    • LID facilities achieved up to 88% reduction in runoff volume and 90% in peak flow.
    • LID implementation delayed peak flows, reducing urban flooding risk during short-duration rainfall.
    • Facility layout, storage capacity, and drainage area were identified as critical determinants of LID performance.

    Conclusions:

    • Integrated LID significantly enhances urban stormwater management and resilience to extreme rainfall.
    • Increasing LID storage depth and spatial coverage are vital for maximizing performance.
    • Scaling up LID infrastructure is essential for future-proofing urban centers against hydrological challenges.