Subsequent flash flooding can occur downstream if the obstruction should suddenly release. Coastal flooding occurs when strong onshore winds push water from an ocean, bay or inlet onto land. This can take the form of surges associated with tropical storms and hurricanes, or can be associated with non-tropical storms such as nor'easters . Urban flooding may occur as land is converted from fields or woodland to more paved areas, losing its ability to absorb rainfall. Urbanization increases runoff 2 to 6 times over what would occur on natural terrain.
Streets can become swift moving rivers, while basements can fill with water.
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