flash-flood

flash flood

noun
a sudden and destructive rush of water down a narrow gully or over a sloping surface, caused by heavy rainfall.

Origin:
1935–40


See flood.
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World English Dictionary
flash flood
 
n
a sudden short-lived torrent, usually caused by a heavy storm, esp in desert regions

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
flash flood   (flāsh)  Pronunciation Key 
A sudden, localized flood of great volume and short duration, typically caused by unusually heavy rain in a semiarid area. Flash floods can reach their peak volume in a matter of a few minutes and often carry large loads of mud and rock fragments.
The American Heritage® Science Dictionary
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