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River Floods
Seasonal rains, snow melt or stalled storms may lead to river floods. River floods occur as part of the natural seasonal cycle and may last a week or more.
Coastal Floods
Floods along coastlines happen when storms or winds push the ocean farther than the normal tide lines. Extreme low-pressure systems and intense on-shore winds, especially from hurricanes and tropical storms, cause coastal flooding. Seismic sea waves, better known as tsunamis or tidal waves, triggered by underwater earthquakes or volcanic eruptions also cause coastal flooding
urban Floods
As urban areas grow, so does the threat of flooding. Pavement and buildings prevent infiltration and increase runoff. Streets can become running rivers and low areas like underpasses and basements may fill with water
Ice Dams and Log Jams
Sometimes ice or other natural materials like trees and shrubs temporarily block runoff. When these materials hold back runoff, the water builds pressure, behaving like a flash flood if the temporary dam breaks suddenly.
Other Flood Events
Severe flooding may occur when levees or dams break or when water must be released from impoundments to relieve pressure. Melting of snow by magma movement may also cause sudden flood events, as with the 1980 eruption of Mt. St. Helens.