Flood

A flood is a natural phenomenon defined by an overflow of a body of water beyond its usual banks or established boundaries. From a physical science perspective, flooding occurs when the volume of water exceeds the carrying capacity of a drainage basin, river channel, or surrounding topography. The primary mechanisms include extreme precipitation events, rapid snowmelt, storm surges, or the blockage of natural drainage pathways, which cause a buildup of hydrostatic pressure. The resulting inundation significantly alters local hydrology and geomorphology, leading to processes such as sediment deposition, erosion, and the temporary reshaping of riparian and floodplain environments. The study of flood frequency, extent, and recurrence intervals is critical for assessing risk and developing predictive hydrological models.