- the melting of snow, particulary when the subsoil is still frozen, so the infiltration capacity is reduced.
- climatic hazards such as cyclones in Bangledesh, hurricanes in the Gulf of Mexico or deep low-pressure weather systems in mid-latitudes bringing abnormally large amounts of percipitation.
The nature of the drainage basin has an influence on the likelihood of flooding. Some drainage basins are more likely to flood than others. Relief, vegetation, soil type and geology all have a part to play. In areas of the world vegetated by dense forest, interception ammd uptake by plants reduce the risk of flooding during times of heavy rainfall.
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