Usually, hydraulic works are calculated and designed flood based on survey documents, past measurements, even using similar basins for calculation. During the exploitation and operation process, these data are often quite old and do not ensure reliability, especially in the context of increasingly obvious climate change. This leads to major changes in water resources, especially characteristics such as flow regime, flood peaks, flood frequency,... Therefore, previously designed reservoirs have high risks during operating process due to changes in flood. This article has updated new data and used the basin rainfall method to recalculate the flood curves for Ta Ranh reservoir. The results show that the design flood peak tends to increase, leading to a higher flood prevention water level compared to the original design documents. The study has provided the scientific basis for the need to upgrade and renovate the Ta Ranh reservoir as well as rebuild the flood regulation operating process with updated data.
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