Climate change impact on urban flooding in Quynhon City, Vietnam

Flooding is one of the major problems in many cities. Adequate development of a drainage system is a primary measure the city used to deal with the problem. However, the risk of exceedance of design flood is more likely to increase due to the impact of urbanization as well as climate change. Changes in rainfall pattern and sea level rise increase the risks of inundation of city dwellings and amenities. This paper investigates the changing of flooding performances using the Stormwater Management Model (SWMM) to describe the impact of climate change on drainage in Quy Nhon city, Vietnam. Climate scenarios are developed for future 2050 and 2100 by following the emissions proposed in IPCC representative concentration pathways (RCP) of greenhouse gases. The results examined the future flooding areas and their durations. It also highlights the inappropriateness in drainage design which could contribute to flooding increase in the city.