Author(s): Tran Thi Bich and Le Hoang Minh

Abstract: Urban flooding has emerged as a critical challenge in densely populated cities due to rapid urbanization, increased impervious surfaces, and climate change-induced extreme weather events. This study aimed to assess the efficacy of Sustainable Urban Drainage Systems (SUDS) in mitigating urban flooding, focusing on their hydrological performance and implementation barriers. Case studies were selected from Ho Chi Minh City, Vietnam, and Hanoi, Vietnam, based on high urban density, impervious surface coverage, and documented flooding incidents. Hydrological simulations using the Storm Water Management Model (SWMM) evaluated runoff volume and peak flow rates under baseline and SUDS scenarios, while thematic analysis of stakeholder inputs identified key implementation challenges. The results demonstrated that SUDS significantly reduced runoff volume by 29.2% and peak flow rates by 31.1% compared to baseline scenarios. A hybrid approach combining SUDS with conventional drainage systems achieved even greater reductions, with runoff and peak flow reductions of 35.6% and 38.9%, respectively. Spatial analysis revealed that areas with impervious surface coverage above 80% benefited most from SUDS interventions. Key barriers to SUDS adoption included spatial constraints, high costs, policy inertia, and limited public awareness. Stakeholders prioritized cost-effectiveness, environmental benefits, and urban adaptability, as evaluated through a Multi-Criteria Decision Analysis (MCDA) framework. The study concludes that SUDS are effective tools for urban flood mitigation, particularly when integrated into hybrid systems and supported by adaptive governance frameworks. Practical recommendations include designing compact SUDS for space-constrained areas, implementing policy incentives, enhancing community engagement, and leveraging emerging technologies for improved performance and monitoring. These findings contribute to the broader discourse on sustainable urban water management and provide actionable insights for policymakers, urban planners, and environmental engineers striving for resilient urban futures.

Pages: 34-38 | Views: 65 | Downloads: 39

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