The increase in impervious area caused by development project has led to proper water management dealing with climate change which can affect the water cycle, including the ecosystem. It has been pointed out as a major cause of water pollution according to the increased runoff from nonpoint source as well as the cause of disasters such as floods and inundation resulted from heavy rains. LID techniques have been widely applied in order to recover water environment conditions prior to the development reducing the impervious area. Although the study on the optimum type, the number and placement of LID facilities suitable for area characteristics is being carried out, it is difficult to determine the efficiency of actual LID facility including the effect of runoff reduction from the combination of LID facility. Consequently, this study analyzes runoff characteristics for the units and combination of LID facilities through actual LID design practices and investigated the effect of runoff reduction and climate change responsiveness for the combination of retention-infiltration facilities as the rainfall scenario. The result confirmed that a combination facilities has about 10% or more of the peak runoff reduction than the single one, observed more outstanding effect of runoff reduction in combination facilities higher the storage capacity of among combination facilities. Particularly, when the proportion of retention-infiltration is 1:2 (1,000 m~3-500 m~2), it was possible to obtain up to 26% or more of the peak runoff reduced. When LID techniques are applied to areas similar to the present study, runoff reduction can be predictable based on the results from this research. Based on the all the method and guidelines for optimum capacity selection of combination facilities of retention-infiltration to achieve the targets of runoff reduction, the approach method proposed by this study can be used as a reference for LID design of future projects suitable for the condition and characteristics of target area.
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