Flood Risk

• Heavy prolonged rainfall

  • Saturates the land increasing flood risk
• Geology

  • Impermeable rocks increase surface run off so water reaches the river channel more quickly increasing the risk of flooding
• Relief

  • Steep hills allow more surface run off as water does not have time to infiltrate rocks
• Land use

  • Urbanisation increases the amount of impermeable rock
  • Deforestation means that interception is lost which means water can reach the river faster