Recently meteorological phenomena caused by climate change have brought localized heavy rainfalls, flash-floods causing severe damage for human-life and property. They also increase the occurrence of record-breaking rainfall. Development in urban area decreases the portion of open spaces, landscapes, leading to significant diminution of storage and detention function of the basin. The expansion of impervious areas increases the extent of peak-runoff and runoff volume, especially the shorter time of concentraion due to development makes the basin have different hydrological characteristics compared to pre-development. In addition, urbanization worsen the requirement of site for residence and public facility so that even floodplain and inundated district are urbanized threatening safety for flood control. In this study, applicable LID techniques are analyzed and implemented using LID modules of SWMM, which is the model for urban stormwater-runoff management in the project area. Effects of implementing LID practices are also assessed and reviewed. The result shows that scenario B and C ruduced 288.52ton(15.62%), 240.26ton(13.01%) each in runoff simulations compared to scenario A.
In recent years, as the occurrence of torrential rainfall in urban area which caused by global climate change has increased, the flood damage also has increased. It's because careful consideration of increase tendency for rainfall wasn't given to the hydraulic structure design standard and the occurrence of rainfall which exceed the design probability rainfall has actually increased. This paper suggests the regression equation which presents the extreme rainfall value in a probability function. The regression equation is made from the observed data and it can be used in design. As a result of the research, it is possible to apply the regression equation to disaster safety assessment of extreme rainfall when the hydraulic structures are designed.
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