In this study a rainfall–runoff model is developed for the Can Le catchment in the upper
stream of the Sai Gon river Basin (Viet Nam). The model will serve for simulation of
catchment runoff into the Dau Tieng Dam reservoir and use as flood forecasting tool at the
Can Le catchment. In modelling many approaches are know and finding a suitable
approach by far is trivial. Can Le catchment is regarded as an ungauged catchment since
data from this area is not systematically collected.