A flood occurs in a floodplain following severe rainfall, prolonged rainfall or the breach of a water source. A flash flood may be caused by several events, including rainfall, levee or dam failure or any sudden release of water. They are often the result of severe storms, such as thunderstorms and hurricanes. Flash floods may be a result of urbanization, which reduces the ability of the area to adequately absorb water.
Flash floods often occur away from where the precipitation actually hit the ground. This is because after long periods of precipitation the soil reaches its saturation limit and then all the precipitation still coming down is converting into runoff. This runoff can create massive floods even long distances away from the precipitation event. This is why there are floods in the valleys below where mountain ranges got precipitation.
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