Changjiang Liuyu Ziyuan Yu Huanjing/Resources and Environment in the Yangtze Valley

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Abstract : This study investigates global urban challenges, with a specific focus on Gbarnga City, Liberia. The primary concern revolves around effective flood management, exacerbated by rapid urbanization, population growth, and climate change. The objective of this study was to evaluate the design and infrastructure of the open urban drainage canal system in Gbarnga City. Open drainage canals were sampled from three shapes: triangular (1.60 km, with an average depth of 33 cm and 97 cm width), rectangular (1.23 km, with an average depth of 41 cm and 136 cm width), and trapezoidal (1.03 km, with an average depth of 26 cm and 97 cm width). The findings reveal that nearly 90% of Gbarnga's open drainage canal systems suffer from inadequate construction, making them highly vulnerable to flooding, as evidenced by significant flood-related damages in 2020. Technical factors negatively impact a substantial portion of open drainage canals, with maintenance-related issues ranging from improper garbage disposal to sediment deposition and overgrown vegetation. Triangular canals are the most affected (94%), followed by rectangular (84%), with trapezoidal canals experiencing the lowest impact (39%). In conclusion, this study highlights the critical role of urban drainage systems in flood mitigation, emphasizing the need for comprehensive solutions in rapidly urbanizing cities like Gbarnga. The study recommends stringent construction standards, maintenance programs, community engagement, professional training, and sustainable drainage techniques to enhance the sustainability and safety of Gbarnga's urban drainage systems.