도심형 홍수 예방을 위한 분산형 빗물저류장치 효과에 관한 연구

Abstract

Abnormal climate phenomena and urbanization recently causes the changes of the hydrological environment. To consist with the green grow policy of the government a fundamental solution such as decentralized rainwater management system and Low Impact Development(LID) techniques should be needed. In this study, urban runoff models for urban flood prevention, SWMM 5, was used to analysis the effects of decentralized stormwater retention. Wolcheon stream watershed localted in Changwon city was selected as the study watershed. SWMM 5 modelling was applied to analyze the runoff characteristic of urban stream with various methods of LID techniques(Permeable packaging, small rainwater storage tank, large rainwater storage tank). The runoff variation characteristics resulted from each of the methods of LID techniques were used to estimate at other places. It was estimated that the permeability of packaging materials and detention storage at the basic floor have high effect to discharge duration curve. And the initial rainfall retention at the rainwater storage tank effected to reduce the flood peak was estimated. These kind of data could be the advantage in the future for securing and maintenance discharge in the river and could use as the basis data for urban flood prevention facilities.