Facts About Flash Floods
Flash floods occur as a result of heavy rainfall, rapid snow thaw, city drains overflowing or dam/levee failures. They occur quickly and unexpectedly, within 6 hours of the events that caused them. Here are more facts to give you an idea of how dangerous flash floods can be:
- Every region in the United States can be affected by flash floods, especially low-lying areas: near river beds and coastlines.
- Cities are more likely to be affected by flash floods due to the predominant impermeable surfaces, such as asphalt, and the lack of natural drainage systems.