flood prevention schemes
- Created by: lucy._.hart
- Created on: 21-10-20 11:58
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- Flood Prevention Schemes
- dams - concrete walls regulating discharge by holding it in a reservoir
- case study - 3 Gorges Dam, China
- hydroelectric power, irrigation, water supply, navigation
- expensive, damage in other areas -> relocation, earthquakes
- channelisation - straightening the channel increasing velocity + widening/deepening to increase capacity of river
- case study - River Ravensborne
- effective, good for shipping, faster velocity because travels less distance + straighter, steeper gradient as meanders removed
- more erosion downstream, changes ecosystem, visual pollution
- embankments - raise banks of river to allow more water to flow through
- case study - Barton by River Trent
- increased carrying capacity, dual purpose
- unnatural, expensive, high maintenance, reduce river access
- floodplain zoning - policies to control urban development close to floodplain, allocating land based on flood risk + importance
- case study - River Exe, Exeter
- no buildings damaged, more parks by river
- doesn't help areas already built on, reduces area that can be built on
- washlands - area next to river returned back to natural habitat, land for river to flood in without destroying property
- case study - River Quaggy, Ravensborne
- natural, used for pitches, low maintenance
- doesn't stop flooding, pitches ruined
- flood relief channels - diverting channels increasing capacity
- case study - River Exe, Exeter
- increased capacity, take pressure off main channel
- hard to build, expensive, when empty full of rubbish
- flood warning systems - early warning of flood
- case study - Met Office
- prepares people, save lives + property, cheap
- doesn't stop flooding, areas with lots of warnings have increased insurance
- dredging - lowers the bed
- increases capacity
- temporary as silt builds up
- wing dykes
- dams - concrete walls regulating discharge by holding it in a reservoir
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