-The flood water is high in a certain period of time, then gradually reduced (Hydro-Meteorological Centre country).-During the rainy season floods, the rains every row on the River, making the water level rise each successive batch, creating floods in streams and rivers. in the month of the rainy season has the strongest intensity, heavy rain, rain water accumulates rapidly, if the spot has no water, rain water flows both into ease, flow caused the flood, when a large flood, flood waters spill over the River, which flows into the back and causing widespread flooding. b. the condition of flooding in the MEKONG DELTA:-Every year, the Mekong Delta has about 1.4 million hectares of flooded in small flood and about 1.9 million ha in the big flood, inundation time from 3-6 months, later than the upstream about 1 month.-Mekong Delta Flood every day up on average 5-7 cm/day, at 20-30 cm high/day. the biggest flood peak is often triggered in late September, early October.-Average flood flow Of the Mekong Delta about 38,000 m3/s. major flood years 40,000-45,000 m3/s. total flood into Mekong Delta around 350-400 billion cubic meters.-Flooding in the Mekong Delta can be divided into 3 periods:+ Flood season (from May 7-8): flood waters on the main river, up drastic, flood water contains much silt.+ The second period is when the flood waters came up high, flood into the main river is driven by 2 in and from the borders of Vietnam, Cambodia tore down Dong Thap Muoi and long xuyen quadrangle.+ The third period is the period of the flood retreated, usually beginning in the lower level, 10-week flood waters down the MEKONG DELTA slowly until December, the public area off flooding.
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