Author(s): Yoshiya Ogawa Masanori Sera; Kotaro Kusakawa; Kosuke Morii; Akitsugu Kajitani
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Keywords: Ogura-Ike Reclaimed Land; Hazard map; Evacuation; Simulation; Field study
Abstract: The area around the Ogura-Ike Reclaimed Land, which spreads on the left bank of the Uji River, is mostly composed of fields, but also has residential areas. The Ogura-Ike Reclaimed Land is located at the lowest altitude of the Yamashiro Basin. Therefore, the Ogura-Ike and Kumiyama drainage stations were installed to counter possible flooding. A flood event with the same level as the flood caused by Typhoon No. 13 in September 1953 has not occurred. However, in recent years, heavy rains and other factors have caused flooding in both levee and non-levee areas of the Kizu and Katsura rivers in the Yodo River Basin. The possibility of flooding in the Uji River is high. This study used flood simulations and field studies to determine how evacuations could be safely conducted using flood hazard maps distributed to each household. The conducted flood simulation showed that the water overflowing from the Uji River flows into the Ogura- Ike Reclaimed Land at altitude. Our field studies confirmed the presence of several manholes. Care has to be exercised when moving to the evacuation sites because manhole covers are likely to open when flooding begins. In addition, the hazard map for a particular region shows little information on the neighboring regions; hence, it is necessary to be aware when considering the evacuation behavior. In summary, this study shows that evacuation could be safely conducted using hazard maps.
Year: 2020