Low impact development, a novel technique for cutting down urban flooding in Quynhon city, Vietnam

Many coastal cities are becoming more vulnerable to flooding due to increases in extreme precipitation as a consequence of climate change and reduction of infiltration due to urbanization. Application of Near-natural stormwater management measures such as Low Impact Development techniques (LIDs) is considered as an alternative option to reduce the risks of urban flooding caused by climate change and urbanization. This technique reduces inundation possibility by using natural or man-made systems to filter and recharge stormwater into the groundwater. In this research, applicability of two LIDs, infiltration trend and swales, was evaluated with case study in Quynhon, Binhdinh province, Vietnam. The results show that, the LIDs work effectively to reduce peak flood and enhance recharged amount groundwater in short duration rainfall. Their effects, however, depend on reaching saturation points of applied measures.