Rainy season usually starts in the region from May to November each year. Natural geographical features of the basin a major impact on the flow characteristics. According to calculations by Tran Thanh Xuan (1988) the total amount of water across the entire basin of the Dong Nai river at about 32.8 x 109 m3 / year, equivalent to the flow layer is 814 mm / year and the flow coefficient of 0.4. in total, the amount of water in the Tri An mainstream is 16.77 x 109 m3 / year with an average flow of 532 years is m3 / s equivalent flow is 35.9 l modules / s.m2, the amount of water in the river baby is 6.5 x 109 m3 / year (about 20% of the total share).
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