Identifying the Reasonable Rainfall Intensity Formula and Intensity–Duration–Frequency Curve for Tan Son Hoa Station, Ho Chi Minh City

Determining the relationship between rainfall intensity–duration–frequency (IDF) is primarily required for the design and management of any city’s drainage system worldwide. In recent years, Ho Chi Minh City has had to face to climate problems such as growth in the extreme rainfall events which resulted in rising serious floods and inundation. This city’s drainage system and flood defense structures were designed based on outdated input criteria, which may no longer be suitable for recent situation. This paper presents updated information on the rainfall IDF curve for Ho Chi Minh City. Moreover, the reasonable rainfall intensity formula-based IDF curves for frequencies of 2, 5, 10, 50 and 100 years are proposed. The results are able to support the local government in designing or upgrading drainage systems.