" What is effect of Flash flood"

A flash flood is a dangerous thing. In some riverbeds there can be sunshine and no rain but somewhere upstream a torrential rainstorm will send water rushing downstream without warning. It carries debris and great volumes of water that can destroy whatever is in its path. it can wash away good topsoil and livestock. Flash floods have raged through towns and taken bridges, people, cars, evenwhole houses with it. Most times a flash flood gives no warning and people underestimate the power that is involved until it is too late.The basic methods of flood control have been practiced since ancient times. These methods include reforestration and the construction of levees, dams,  reservoirs, and floodways (artificial channels that divert floodwater).