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Causes of floods - Coggle Diagram
Causes of floods
Rainfall
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Long period of rainfall
The soil underground gets filled with water (until there is no more space for more), so the water has to flow through the surface directly into the river.
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Rock
Impermeable rocks
The impermeable rocks don't let the water pass through them so the water flows directly to the river making it overflow.
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Land use
Towns and Cities
Water cannot soak into the concrete and tarmac, so the water stays where it landed.
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