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Climate change and increase of surface runoff by urbanization caused the urban flooding. Therefore, a sustainable new paradigm is required to recover sound water circulation and overcome the limitations of the existing water management system vulnerable to flooding. Recently Rainwater management is widely known and its legal obligation is strengthened to improve the control capacity for flooding reduction and water conservation in urban areas. Multipurpose DRMS(Decentralized Rainwater Management System) is a new paradigm proposed and recommended by NEMA(National Emergency Management Agency) for both flood control and water conservation. In this study, a flood prone area in Suwon of South Korea is selected and analysis of DRMS has been made using XP-SWMM for different scenarios of RT installation with same total rainwater tank volume and location. In addition, the effects of water resources secure were analyzed in accordance with using stored rainwater in tank. Also according to a strong will of local governments for DRMS application in developing area, the additional guidelines were first given for DRMS design method and modeling realization using XP-SWMM, know-how for data collection and transformation. As a result, installing one rainwater tank of 3,000㎥ can reduce the peak flow rate by 15.5%. Installing six rainwater tanks of 500㎥ volume in the area can reduce the peak flow rate by 28%. Three tanks concentrated in the middle region can reduce peak rate more than evenly distributed tanks. In case of the same tank volume, the more the number of rainwater storage tanks installed, the more the better water quality was guaranteed. The method and results found from this study can be used for the design and performance prediction of DRMS at a flood prone area by supplementing the existing system, which contribute to design rainwater management system at small scale development area of P city in reality.


Session R75, Hydrologic Modeling and Aspects of Decentralization


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