Physical causes of flooding
- Created by: therevisionlife
- Created on: 03-03-16 11:15
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- Physical Causes
- The releif
- A steep-sided valley means water will enter the river more quickly
- Precipitation
- Excessive levels occurring over a prolonged period of time leads to the saturation of soil
- Intensive rainfall over a short period of time cannot infiltrate the ground quickly enough
- Drainage Basin Size and Shape
- A large Drainage basin means more water is collected, increasing discharge
- A circular shape will produce a shorter lag time with high peak discharge (which van lead to flash floods)
- Melt Water
- Melting of snow, particularly when the ground is still frozen
- Soil and rock type
- Saturated soil Impermeable and non-pourous rocks will not infiltrate ,increasing overland flow and run off
- Size of River Channel
- More Tributaries leads to a higher discharge
- A narrower shallower channel increases the the chances of flooding
- Storms
- Abnormally large amounts of precipitation increasing discharge.
- Vegatation
- Sparse vegataion cover reduces interception so more water will enter the river
- No vegetation means the soil is likely to be eroded and enter the river reducing its capacity
- Natural causes from the natural enviroment
- The releif
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