Flash floods often have a dangerous wall of roaring water that carries rocks, mud, and other debris and can sweep away most things in its path. Overland flooding occurs outside a defined river or stream, such as when a levee is breached, and still can be destructive. Flooding can also occur when a dam breaks, producing effects similar to flash floods. The National Weather Service (NWS) estimates that flooding caused approximately $50 billion damage in the U.S. in the 1990s (NWS-HIC 2001).
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