Poor drainage of urban storm water can lead to urban inundation which presents a risk to people and property. Previous research has presented various measures to prevent and reduce urban flooding and these measures can be classified into costly but effective structural measures, and economical but less effective non-structural measures. This study suggests a new approach to reduce urban flooding by combining structural and non-structural measures in a target watershed in Seoul, South Korea. Inlet design modification in a detention reservoir (Decentralized Reservoir, DR) is examined in conjunction with combined inlet/outlet management for the DR. Monitoring nodes used to control DR inlet/outlet operations are selected by locating the first flooding node, maximum flooding node and DR inlet node. This new approach demonstrates outstanding flood volume reduction for historical flooding events that occurred in Seoul during 2010 and 2011. Flood volumes during the 2010 event using the combined inlet/outlet operation in the DR were between 1656 m 3 and 1815 m 3 compared to a flood volume of 6617 m 3 using current DR operation. Finally, the suggested operating level for the DR based on the best hydraulic section, system resilience index, and local regulations is 1.2 m.
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机译：城市雨水排水不良会导致城市淹没，这对人员和财产构成威胁。先前的研究提出了各种预防和减少城市洪灾的措施，这些措施可以分为成本高昂但有效的结构性措施，以及经济但效率低下的非结构性措施。这项研究提出了一种通过结合结构性措施和非结构性措施来减少韩国首尔目标流域的新方法来减少城市洪灾。结合DR的进/出口管理，检查了滞留池（Decentralized Reservoir，DR）中的进水口设计修改。通过定位第一个洪水节点，最大洪水节点和DR入口节点来选择用于控制DR入口/出口操作的监视节点。这种新方法展示了针对2010年和2011年在首尔发生的历史性洪水事件的出色洪水量减少。与洪水相比，在DR中使用入口/出口组合操作在2010年事件期间的洪水量在1656 m 3和1815 m 3之间使用当前DR操作的最大容积为6617 m 3。最后，基于最佳水力部分，系统弹性指标和当地法规，DR的建议操作水平为1.2 m。
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