1.The main factors and causes) that affect the drainage system to the flood. Can be classified according to the severity level into 3 (1) level to severe flooding occurred in the area with high slope is the main factor.Resulted in various areas of high flood into the lowland (2) level flooding medium, there are the main factor and caused heavy rains and continuously for a long period of time. There are also factors to support.Assembly with no reservoir water level and the river bank was low. The flood overflowed the banks resulted in (3) level flood light occurs in the lowlands, a key factor.There are also factors to support. Drainage network system performance Due to the river basin. The bounds Mae Mae meets the river at the bottom. The lower river MAE is narrow, winding and shallowWith the expansion direction until the invasion of waterfront area and construction of FAI slow water. Weir type no door opens and closes. The flood overflowed and resulted in the flooding conditions
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