Rivers
- Created by: freddieam
- Created on: 06-04-16 15:30
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- Rivers
- River Flooding - BOSCASTLE
- Causes
- Heavy rainfall in short period of time with quick surface run-off
- Steep sided channel
- Lack of vegetation or woodland
- Effects
- Roads closed
- Tourism seriously affected
- Mud and debris left in town
- Buildings destroted
- Bridges washed away
- Stress for locals
- Car parks flooded
- Low bridges washed away
- Management
- Soft-engineering options
- Afforestation
- Relatively low cost option
- Trees are planted near to the river. This means greater interception of rainwater and lower river discharge
- Managed flooding
- The river is allowed to flood naturally in places, to prevent flooding in other areas - for example, near settlements.
- Planning
- Local authorities and the national government introduce policies to control urban development close to or on the floodplain
- There can be resistance to development restrictions in areas where there is a shortage of housing. Enforcing planning regulations and controls may be harder in LEDCs
- Afforestation
- Hard-engineering options
- Dam construction
- Water held back and released in a controlled way
- Can be very expensive
- Sediment can get trapped behind the dam leading to erosion downstream
- Water is usually stored behind the dam in a reservoir, this water can then be used to generate hydroelectric power or for recreation purposes.
- River engineering
- It may be widened or deepened allowing it to carry more water
- River channels may be straightened so that water can travel faster along the course
- The channel course can be altered, diverting floodwaters away from settlements
- Dam construction
- Soft-engineering options
- Causes
- Meanders
- River Flooding - BOSCASTLE
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