There are many reasons why a river floods. Draw a line to link each cause of flooding to the correct explanation.

1. Deforestation
- If trees are removed, there is less interception and infiltration.

2. Previous weather
- The more saturated the soil, the less infiltration can take place.

3. Rock type
- Impermeable rock leads to greater overland flow.

4. Relief
- Steeper gradients lead to faster overland flow.

5. Heavy rainfall
- The infiltration capacity is quickly exceeded, and overland flow takes place.

6. Urbanisation
- Concrete and tarmac are impermeable and lead to more overland flow.

Deforestation reduces infiltration and increases overland flow. Heavy rainfall saturates soil, decreasing infiltration. Urbanization with impermeable surfaces leads to more overland flow.

Explanation:

Deforestation: If trees are removed, there is less interception and infiltration, leading to more overland flow.

Heavy rainfall: The more saturated the soil, the less infiltration can take place, resulting in overland flow.

Urbanization: Concrete and tarmac are impermeable, leading to more overland flow as they prevent water infiltration.

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