Study on Response Capacity of Drainage Systems in Coastal Urban of Vietnam Under the Impact of Extreme Weather Events

Authors

  • Van Hong Nguyen

    Sub-institute of Hydrometeorology and Climate Change, Ho Chi Minh City 70000, Vietnam
  • Thanh Long Pham

    Sub-institute of Hydrometeorology and Climate Change, Ho Chi Minh City 70000, Vietnam
  • Thao Hien Nguyen

    Sub-institute of Hydrometeorology and Climate Change, Ho Chi Minh City 70000, Vietnam
  • Truong An Dang

    1. Department of Oceanology, Meteorology and Hydrology, University of Science, Ho Chi Minh City 70000, Vietnam; 2. Viet Nam National University, Ho Chi Minh City 70000, Vietnam

DOI:

https://doi.org/10.30564/jees.v7i6.9437
Received: 10 Mach 2025 | Revised: 28 April 2025 | Accepted: 10 May 2025 | Published Online: 10 June 2025

Abstract

Coastal cities in Vietnam face increasing urban flooding vulnerability due to climate change-induced extreme precipitation. This study evaluates the response capacity of urban drainage systems, using Vung Tau City as a case study. We employed a comprehensive approach, combining Intensity-Duration-Frequency (IDF) curve analysis with hydrodynamic modeling, to assess drainage performance under current and projected rainfall intensities. A significant rainfall event on June 19, 2020 (54.4 mm in 3 h, peaking at 42 mm/h), which exceeded the 5-year return period design (TCVN 7957:2008), caused widespread flooding (25-50 cm depths). Design rainfall hyetographs for 2, 5, and 10-year return periods (TCVN 7957:2008) were developed. Results show that under more extreme scenarios, flooded areas increase significantly, with depths up to 1.05 m in the 10-year scenario and prolonged durations due to stormwater routing through regulatory lakes. The analysis reveals the current infrastructure meets only 64% of the 5-year return period demands and merely 41% for a 10-year period. This research highlights the urgent need for enhanced flood management in Vung Tau and similar coastal cities, suggesting upgrades to drainage capacity, implementation of sustainable urban drainage systems, and improved early warning. These insights are valuable for developing climate-resilient infrastructure.

Keywords:

Urban Flooding; Drainage System; Extreme Rainfall; IDF Curve; Climate Change

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How to Cite

Van Hong Nguyen, Thanh Long Pham, Thao Hien Nguyen, & Truong An Dang. (2025). Study on Response Capacity of Drainage Systems in Coastal Urban of Vietnam Under the Impact of Extreme Weather Events. Journal of Environmental & Earth Sciences, 7(6), 267–279. https://doi.org/10.30564/jees.v7i6.9437

Issue

Vol. 7 , Iss. 6 (June 2025): In Progress

Article Type

Article

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Copyright © 2025 Van Hong Nguyen, Thanh Long Pham, Thao Hien Nguyen, Truong An Dang

Creative Commons License

This is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License.

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