Causes of flooding
- Created by: alicegrace22
- Created on: 21-11-17 09:52
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- Causes of flooding
- Physical factors
- Heavy rainfall
- Water reaches the ground quicker- shorter lag time
- Saturated ground
- Ground can't hold any more water- more surface run off
- Melting snow
- Increased water levels in the river
- Steep slopes
- Water rushes the river quickly
- Gentle slopes
- Water takes longer to reach the river - longer lag time
- Rock type is hard
- Impermeable- more surface run off
- Frozen land
- Rain on a frozen surface runs straight off- more surface run off
- Heavy rainfall
- Human factors
- Man made surfaces are impermeable
- More surface run off- water reaches the river quicker
- Deforestation means there are less trees/ vegetation
- Less water is intercepted- more water reaches the ground
- Dams are built
- River levels and flows can be altered
- Man made surfaces are impermeable
- Physical factors
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