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The Water Cycle
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Processes - Erosion
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Flooding and management
The Great Floods of 2000
Case Study - Ganges/Brahmaputra River Basin

cloud formation
Condensation is a key element of the water cycle
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Floods can bring both advantages and disadvantages to an area. Floods can deposit rich, fertile alluvium on agricultural areas. Also, flood water can replenish irrigation channels. On the other hand floods can destroy food supplies, homes and transport infrastructures.

Causes of flooding

Human causes:
Deforestation - Cutting down trees causes increased run-off (water flowing over the surface of the earth). Rain water reaches rivers faster. Flooding becomes more likely.
Urbanisation - Man-made surfaces such as concrete result in greater run-off. Rain water reaches rivers faster and can cause flooding.

Natural causes:
Heavy rainfall
Melting snow

Solutions to flooding

Afforestation - Planting more trees reduces run-off and increases interception.
Dams - Although very expensive, dams can significantly reduce the risk of flooding downstream

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