Human causes of flooding

Question 1

Deforestation-

Answer 1

Vegetation collects, stores and uses water from rainfall: this is called interception.
Plant roots also encourage water to pass into soil and rock, so vegetation reduces runoff: if it is removed, more water can reach the river channel more quickly.

Question 2

Urbanisation-

Answer 2

In towns and cities there is a lot of concrete due to houses. This causes the water to run off immediately into drains and river channels.