Flood Reduction in Urban Drainage Systems: Cooperative Operation of Centralized and Decentralized Reservoirs

Eui Lee,Yong Lee,Donghwi Jung,Joong Kim,Jin Joo

doi:10.3390/w8100469

Abstract

Failure of drainage systems leads to urban flooding; therefore, structural measures such as the installation of additional drainage facilities, including pump stations and detention reservoirs, have been adopted in the past to prevent and mitigate urban flooding. These measures, however, are costly and time consuming. To maximize flood mitigation efficiency, it is essential to also implement non-structural measures such as effective operation of drainage facilities. In this study, we propose a new cooperative operation scheme for urban drainage systems that involves linking centralized reservoir (CR) and decentralized reservoir (DR) operations by sharing water level information at monitoring nodes. Additionally, we develop a resilience index to assess the system's ability to mitigate, restore, and recover from inundation (i.e., failure). Most results show that flood reduction and resilience in cooperative operations are better than the current operation. However, the results of CR operation for 2010 are worse than the current operation at high monitoring node levels (1.4 m–1.5 m), and the results of DR operation for 2011 are worse than the current operation at low monitoring node levels (0.8 m–0.9 m). All results related to flood reduction and resilience in cooperative operation are superior to the current operation.

Highlights

In urban areas, various drainage facilities such as pump stations and detention reservoirs have been constructed
Various urban drainage facilities are operated in each area, often regardless of the sewer conduit
Individual decentralized reservoir (DR) operation is inferior to the current operation in 2011 when the monitoring node levels are 0.8 m and 0.9 m

Summary

Introduction

Various drainage facilities such as pump stations and detention reservoirs have been constructed. Detention reservoirs can reduce the peak discharge in urban drainage systems. It is difficult, to prevent flooding due to extreme rainfall, even though all drainage facilities are designed and constructed using the concept of design flood frequency [1]. To prevent flooding due to extreme rainfall, even though all drainage facilities are designed and constructed using the concept of design flood frequency [1] Both structural and non-structural measures can be implemented to prevent and reduce flooding. Structural measures are any physical construction used to reduce or avoid possible impacts of flooding, as well as engineering techniques used to achieve flood-resistance and resilience in urban drainage systems

Methods

Results

Conclusion