Author(s): Cheng-Sheng Pong; Shih-Bin Lin; Yung-Chia Hsu
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Keywords: Drainage system; Drainage design standard; Flood inundation; High resolution hydrodynamic model
Abstract: This study investigates the performance of Wenshan drainage system before and after three new hydraulic engineering projects installed between 2015 and 2017 in Wenshan District of Taipei City. Owing to high population density of Taipei and high housing price, Wenshan since 40 years ago had its advantage for land development as a residential area. However, Wenshan District also has a disadvantage of tending for flood inundation due to its hilly landform. Taipei City Government in the last 40 years spared no effort to increase its drainage design capacity. The newly installed hydraulic engineering projects between 2015 and 2017, including: two detention ponds and one diversion tunnel, are aiming to reach the goal of 5-yr design standard of 78.8 mm/hr. A high resolution 2D hydrodynamic model which integrates quadtree and subgrid techniques was employed to evaluate flood inundation before and after the installation and the performance of the three projects. Results show that the flood inundation model demonstrates its capability for accurate simulation through photos comparisons in the validation process and the flood inundation has been substantially improved after the installation of the three projects.
Year: 2018