Abstract
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 m3 and 1815 m3 compared to a flood volume of 6617 m3 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.
Highlights
The frequency of extreme rainfall events has increased with recent environmental change.the extent of impervious surfaces in urban areas has risen rapidly
This study focus on combined measure for detention reservoir in urban drainage system such as alternative inlet design and inlet/outlet operation of detention reservoir
Results for outlet operation in the DR are between 552 m3 and 703 m3
Summary
The frequency of extreme rainfall events has increased with recent environmental change.the extent of impervious surfaces in urban areas has risen rapidly. The incidence of urban inundation has increased markedly. To mitigate the risk of urban inundation, many solutions for preventing urban flooding have been suggested [1]. These solutions can be categorized into structural and non-structural measures. Structural measures refer to infrastructure changes including the construction of new drainage facilities and rehabilitation or replacement of sewer networks. Non-structural measures refer to technological or behavioral innovations which do not require significant infrastructure investment, including flood prediction, improved rainfall forecasting, and revised operating procedures for drainage facilities. Non-structural measures are significantly cheaper to apply as compared to structural measures they are somewhat limited in their ability to prevent or reduce flooding. Improving the operation of drainage facilities can do little to reduce flooding if the facility was designed to withstand a 30-year maximum rainfall event and a 100-year maximum rainfall event occurs
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