A flash flood.
A flood that happens do to the overflow of a lake/river.
the land is washed away and than rebuilt
flash floods
there were 7 rescue helicopters scrambled in the boscastle flash flood according to the BBC
flash flood wall
How big can a flash flood be?
Flash flooding is when a flood happens very quickly, with not a lot of time to warn anyone, as when a dam breaks.
In 2007 in July Glouctestershire was hit by flash flood (a flash flood is a flood that happened really quick due to lots of rain)
flash flood
No there is no flash flood.
1 in August 17 1998 flash flood and 1 in March 2011 flash flood