The flood is a phenomenon that occurs naturally. Due to rain the watershed with large quantity and fall for a long time. The runoff along the ground surface into the sewers, streams and rivers., or a community without drainage, complete and man of action, so when heavy rains for a long time, each time, the problem is caused flooding on the area.We can use science to solve the flood by creating a dam. In addition to dam is to store water for this will drain the reservoir water little components have been used in many aspects.Or the dry season, when entering the rainy season the following year. The dam will have a lot of water in the area to accommodate the quantity stored, which can prevent and decrease the problem flood in the lower area.