5th International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991

Section 4: Hydrological Data and Analysis

Page 239

Characteristics Of Maximum Daily,Rainfall On Vietnam And It's Influence On Soil Erosion

Nguyen Van Tuan, Le Van Lan
Hanoi University, Vietnam

Abstract

Vietnam is the Tropical country, so its rainfall is high and its periods of sunlight are long. It's rainfall, especially, daily rainfall is the main cause of the flood and soil erosion. Studies of maximum daily rainfall serve as a base estimate flood and soil erosion.

This article expresses the results of the studies undertaken for many years about rainfall and soil erosion all over Vietnam Consisting of more then 1000 rainfall station with ten years data and data of 40 erosion tanks at Tay Nguyen-central part of Vietnam and at Vinh Phu province. Also this article mentions the following ideas:

1. The causes of flood Rain in Vietnam 
2. Characteristics of an annual Rainfall and maximum daily Rainfall, it's spatial-duration variation. 
3. Methods for calculating the maximum daily Rainfall.  
4. Influence of Rainfall on soil erosion and methods of soil erosion estimation based on maximum daily Rainfall data. Characteristics of maximum daily rainfall on Vietnam and it's influence on soil erosion

The main causes of flood Rain in Vietnam, Vietnam is the Tropical monsoon country, so that it's rainfall is very high. Many Researchers (5,6,7,9) show two main factors that cause flood Rain in Vietnam. They are:

• The action of world air masses (General circulation of air masses and 
• Geography.

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