A flood caused by heavy or excessive rainfall in a short period of time, generally less than 6 hours is known as a flash flood. It is usually characterized by raging torrents after heavy rains that rip through river beds, urban streets, or mountain canyons sweeping everything before them. They can occur within minutes or a few hours of excessive rainfall.
The intensity of the rainfall, the location and distribution of the rainfall, the land use and topography, vegetation types and growth/density, soil type, and soil water content all determine just how quickly the Flash Flooding may occur, and influence where it may occur.
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