A Study of Flood Detention and Water Resources Exchange in Taichung Disaster Prevention Park

• Main Authors: Chung-Yen Tsai, 蔡宗諺
• Other Authors: 林昭遠
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/r3tp72

碩士 === 國立中興大學 === 水土保持學系所 === 106 === Taiwan suffered from frequent earthquakes and floods due to its geographic location, topography, and uneven rainfall distributions. Fengle Park was designated as the first disaster prevention park by the Taichung municipal government. This park was also used as the temporary refuge and shelter for victims from disasters. In order to take rescue action smoothly, it is important that the surrounding area of the park was free of flood. Hence, inventory and examination of the water-holding facilities and/or functions are necessary in the park. Fengle Park was taken as a case study and the facilities in the park were checked and analyzed. Flooding potential of the park and its nearby areas were also inspected. Feasibility of the operation mechanism of the water resources exchange was further discussed. Based on the maximum daily rainfall of a fifty-year return period, risk analysis showed that the inundation depth was less than 50cm which is classified as low grade. Therefore, Concepts of water diversion could be manipulated to guide the runoff at the nearby riparian areas to the park’s detention ponds during extreme rainfall event. The water storage capacity could be increased from 14,000m3 to 32,000m3 under the operation of improved detention facilities coupled with water tank installation. Permeable material was adopted to improve the bottom of the detention ponds. The detention volume could be increased to 18,000m3 and the flooding area could be reduced about 36,000m2. The newly depression sites could be planned as the operational center of water resource exchange which is employed to recycle the water resource of the excavation of tall building and/or huge development. The recycled water resource could be used as microclimate regulation, landscape ecology, fire extinguisher, and construction cleaning. The exchange mechanism of the recycled water could be promoted in the short term, and should remedy relative regulations for the middle and/or long term. Maintenance foundation should be also raised for the park to work effectively during normal and disaster period. The study results could be provided as the reference of related authorities.