Factors increasing flood risk

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  • Factors increasing flood risk
    • human factors (land use)
      • urbanisation
        • impermeable surfaces, e.g. tarmac roads, maean water flows quickly into drains, sewers and river channels
      • deforestation
        • when trees are removed, much of the water which had been evaporated from leaves or stored on leaves and branches flows rapidly into river channels
      • agriculture
        • exposed soil can lead to increased surface runoff
    • physical factors
      • precipitation
        • torrential rainstorms and/or prolonged periods of rain can lead to flooding
      • geology
        • impermeable rocks don't allow water to pass through, so it flows overland into river channels
      • relief
        • steep slopes mean water flows quickly into river channels


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