A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, tropical storm, or meltwater from ice or snow flowing over ice sheets or snowfields. Flash floods may also occur after the collapse of a natural ice or debris dam, or a human structure such as a man-made dam, as occurred before the Johnstown Flood of 1889. Flash floods are distinguished from regular floods by having a timescale of fewer than six hours between rainfall and the onset of flooding. The water that is temporarily available is sometimes used by certain plants for growth. However, plants that thrive in drier areas can be harmed by flooding, as the plants can become stressed by the large amount of water.
Flash floods induce severe impacts in both the built and the natural environment. Especially within urban areas, the effects of flash floods can be catastrophic and show extensive diversity, ranging from damages in buildings and infrastructure to impacts on vegetation, human lives and livestock. flooding new york city, flood in new york, floods videos, flash flooding, flooding in china 2020, flooding in china, flooding caught on tape, flooding in Jamaica, flooding in Jamaica 2020, flooding house, flooding, flooding in India, flooding in Africa, flooding in France, flooding caught on camera, flood caught on camera, flood china, flood in germany, flash floods caught on tape, flash floods caught on camera
An impact severity scale is proposed in 2020 providing a coherent overview of the flash flood effects through the classification of impact types and severity and mapping their spatial extent in a continuous way across the floodplain. Depending on the affected elements, the flood effects are grouped into 4 categories: impacts on built environment impacts on man-made mobile objects, impacts on the natural environment (including vegetation, agriculture, geomorphology, and pollution) and impacts on the human population (entrapments, injuries, fatalities). The scale was proposed as a tool on prevention planning, as the resulting maps offer insights on future impacts, highlighting the high severity areas.
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