Abstract
Recently, the number of extreme rainfall events has increased because of climate change. The ever-widening impervious area in urban watersheds also continuously augments runoff volume. Most measures to prevent urban inundation are structural, such as the construction, rehabilitation, and replacement of urban drainage facilities. Because structural measures require time and money, nonstructural measures are also required for the efficient prevention of urban inundation. Current operations in Korea focus on the individual operation of urban drainage facilities while neglecting the status of effluent streams. A study on urban drainage facilities that considers the status of urban streams is necessary to improve the operation of drainage facilities in urban areas. A revised resilience index is suggested to evaluate measures. For the historical rainfall event in 2010, the system resilience for current and integrated operations was 0.199 and 0.238, respectively. For the 2011 event, the system resilience for current and integrated operations was 0.064 and 0.235, respectively. The integrated operation exhibited good performance for the 2010 and 2011 events. Based on the results of this study, an operation as a nonstructural measure for the total management of urban areas is proposed. The revised resilience index could support decision-making processes for flood-management plans.
Highlights
As the discharge in urban areas has increased because of urbanization, various measures to prevent inundation have been considered
The selection of monitoring nodes is required for the integrated operation of drainage facilities, such as a centralized reservoirs (CRs) and a decentralized reservoir (DR)
Historical rainfall events in 2010 and 2011, when flooding occurred in the Dorim stream, were selected for the rainfall runoff simulation, in which the current and integrated approaches for operating drainage facilities, including CR and DR operations, were applied to the target watershed
Summary
As the discharge in urban areas has increased because of urbanization, various measures to prevent inundation have been considered. The previous studies focused on the individual real-time control (RTC) and cooperative operation of urban drainage facilities in a single drainage area. This study proposes a new operation approach that considers the overflow in urban streams and the inundation of inland drainage areas simultaneously as well as the improvement of system resilience. The denominator was very large compared with the flooding volume per minute in the numerator This was because the denominator was multiplied by the rainfall amount considering the time of concentration (or the total rainfall amount) and the unit area (or the watershed area). The revised resilience index can better reflect the status of urban drainage systems It is calculated using real-time rainfall data and is easy to apply. A revised resilience index is needed to overcome the disadvantages of the previous indices
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