The natural disaster characterized by a rapid flow of water is a flash flood. Flash floods occur suddenly, usually within six hours of heavy rainfall or sudden water release from dam failures or rapid snowmelt. They are dangerous due to their swift onset and can lead to significant property damage, loss of life, and disruption of infrastructure. Characteristics include high water levels, strong currents, and debris flow, which can impact urban areas, rivers, and other regions. Preparedness and quick response are vital in mitigating the effects of flash floods on communities.