Flood study in downstream of river Sai Gon - Dong Nai

The region in the lower reaches of the Sai Gon -Dong Nai rivers, in general, and Ho Chi Minh City, in particular, is a large, rapidly developing economic center of Vietnam.It faces many pressing problems, of which the housing shortage and flooding are unresolved.This study uses the MIKE 11, MIKE 21, and MIKE Flood models to estimate the flood area and depth with and without flood control structures, providing a benchmark for each building and flood zone.The calculation results showed that the commissioning of flood control structures will help protect the city's central areas from flooding; the flood area will decrease, while the flooding of external areas during the operation of hydraulic structures will increase.Calculating the depth for each flood zone and establishing reference building elevations necessary for spatial planning can provide scientific input to the Ho Chi Minh City planning and construction management authorities in developing measures to minimize flood damage soon.