The correct answer is Flash flood.
A sudden flood that is a result of heavy rain is called a flash flood. It lies in the low lying areas. The rain might sometimes accompany thunderstorm, hurricane, or snowfield. The difference between a flash flood and normal flood is that it lasts less than till 6 hours. In this case a high place can be used as a temporary shelter and once the flash flood is gone, anyone can shift to his or her normal routine.