Abstract

In the context of climate change, the impact of extreme rainfall and its knock-on effects has increased sharply in the mountainous districts of Quang Nam province, Vietnam. The basin division method, combined with assessing flash flood risk by basin with the maximum daily rainfall threshold, is divided into 77 basins with five levels of flash flood risk in mountainous districts in the region research area. The results show that low risk (I and II) accounts for 79.5% of the entire mountainous district, and high and very high-risk levels (IV and V) account for 10.5% distributed in mountainous areas district (Nam Tra My, Tay Giang) belonging to 7 basin areas (417, 44, 419, 393, 402, 425 and 415).