Heavy rains and prolonged (due to storm) is the main cause of the flood, also in the River Delta region adjacent to the sea, the tide is a factor to make the flooding worse. There are also a number of other factors affect the ability of large floods and unusual appearance.-The wider basin flood water up slowly but will also withdraw slowly, in contrast to the long, narrow basin will make flood water up fast ....-a few cases will form the flash floods, flood tube-The forest devastation also causes up floods and soil erosion-The phenomenon of El nino and La nina has caused drought and flood phenomena on different parts-If a river system has many rivers form the combination possibilities
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