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Effectiveness on Storm Water Management of Green City Planning Elements: Focusing on Multipurpose Rainwater Utilization Facilities

윤재봉 1,  KWON TAE JUNG 1

1동아대학교

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ABSTRACT

This study attempts (1) to find effective urban design elements in consideration of both heavy rainfall hazard mitigation and green city planning and (2) to evaluate their effectiveness in the field, a natural disaster-prone urban district in Busan, Korea. The analytical matrix considering previous green city planning research and ICPP’s three factors of disaster risk suggests three main urban design elements that can be used against heavy-rainfall natural disaster, which elements include green roof, permeable urban surface, and rain water utilization facility. Rain water utilization facility is, however, introduced alone to the field analysis given that its effectiveness has not been fully tested in the previous studies. The field analysis using EPA-SWMM reveals the possible role of rain water utilization facilities in reducing the amount of the peak flow reduction as well as in expanding the runoff flow time. The analysis also suggests that a better result is expected when rain water utilization facilities with small-to-medium capacity are introduced in a dispersed way. The analytical results help guiding municipal governments’ hazard mitigation efforts in consideration of green city planning and also promoting future studies to make connections between green city and hazard resilient city planning efforts.

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