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Causes of floods are given below:

1. Soil erosion.
2. Increasing level of rainfall.
3.  Heavy Storms.
4. Dams

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> heavy rainfall
Excessive levels of precipitation occurring over a prolonged period of time. This eventually leads to saturation of the soil. When the water table reaches the ground surface, there is increased overland flow or runoff
Coastal flooding - 
Flooding always occurs in coastal areas. High tides or storms cause the water level to rise. If the water level is higher than the level of the coastal lowland, flooding will occur. 

Flooding often occurs in lowlands. This is because rivers flow more slowly in low-lying areas. If the water volume increases suddenly, floods occur. 
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