Flash floods can occur within minutes or hours of excessive rainfall, a dam or levee failure, or a sudden release of water held by an icejam. Overland flooding, the most common type of flooding even typically orccurs when waterways, such as rivers or streams, overflow their banks as a result of rainwater or a possible levee breach and cause flooding in surrounding areas. It can also occur when rainfall or snow melt exeeds the capacity of underground pipes, or the capacity of streets and drains designed to carry floodwater away from urban areas. Read On

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