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Flash floods can come with no warning. Floods may: Result from rain, snow, coastal storms, storm surges and overflows of dams and other water systems. Flash floods occur when heavy rainfall exceeds the ability of the ground to absorb it. Flooding and flashing flooding are not restricted to specific areas of the country. Develop slowly or quickly. Floods can be dangerous for communities, lasting days, weeks or sometimes even longer. RIVER FLOOD Flooding along rivers is a natural and inevitable part of life. In a flood, a lot of water may collect in an area while there is hardly any water in another area. Floods are the most common natural disaster in the United States. Flooding is a longer term event and may last a week or more. Flash flooding occurs within 6 hours of the rain event. They can cover an area with just a few inches of water or they can bring enough water to cover the roof of a house. Flash floods are the most dangerous kind of floods, because they combine the destructive power of a flood with incredible speed. Failing to evacuate flooded areas or entering flood waters can lead to injury or death. Some floods occur seasonally when winter or spring rains, coupled with melting snows, fill river basins with too much water, too quickly. Flooding may occur as an overflow of water from water bodies, such as a river, lake, or ocean, in which the water overtops or breaks levees, resulting in some of that water escaping its usual boundaries, or it may occur due to an accumulation of rainwater on saturated ground in an areal flood. Flood waters are more dangerous because they can apply much more pressure than an ordinary river or a calm sea. This means that there so much water that does not have an exit channel. Floods can happen almost anywhere. A flood is an overflow of water onto land that is normally dry. 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