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Flood solutions – soft engineering strategies There is discussion about the costs and benefits of hard and soft engineering and debate about which is the better option
Lesson objectives: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Soft Strategies ,[object Object],[object Object],[object Object],[object Object]
Soft Engineering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Floodplain Zoning ,[object Object],[object Object]
Land use management = flood plain zoning It restricts development – a problem when there is a shortage of housing It can’t be used in areas that are already urbanised There are no new buildings or roads on the flood plain to be damaged so the impact of any flooding is reduced It provides recreational opportunities Planning restrictions prevent buildings or roads being constructed on the flood plain.  Use of the floodplain is restricted to things like playing fields, allotments or parks.  More water can infiltrate grassy surfaces so there is less surface run off which reduces discharge and flooding Disadvantages Extra benefits How it works
Wetland and river bank conservation Less land is available for farming Vegetation protects against soil erosion Vegetation creates wildlife habitats Wetlands store flood water and also slow it down.  This reduces flooding downstream.  Conserving or re-establishing wetlands gives natural protection from flooding.  Planting trees and shrubs along the river bank increases interception and lag time and reduces discharge.  This also decreases flooding (= riparian buffers) Disadvantages Extra benefits How it works
River restoration Local flood risk can increase especially if nothing is done to prevent major flooding Little maintenance is needed as the river is left in its natural state The river provides a better habitat for wildlife Making the river more natural – e.g. by removing man made levees and allowing the river to flood naturally.  As the water spreads out over the floodplain, the river’s discharge is reduced which reduces the flooding risk downstream Disadvantages Extra benefits How it works
Weather forecast and flood warnings …. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Which is more sustainable – hard or soft engineering? ,[object Object],[object Object],[object Object],[object Object]
Homework ,[object Object]
How can the risk of flooding be reduced? Control  LAND USE Stop  people  building on the floodplain Plant trees  to increase interception and infiltration
Control land use
Homes On Stilts
Re-planting Trees
Flood protection *Dams  *reservoirs  *straighten channels *Dredging *levees and embankments *land use zoning *afforestation plenary The challenge: to talk for sixty seconds on one of the flood control measures without any hesitation, repetition or deviation.
Your turn … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
homework ,[object Object],[object Object]

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L10 Soft Engineering Strategies

  • 1. Flood solutions – soft engineering strategies There is discussion about the costs and benefits of hard and soft engineering and debate about which is the better option
  • 2.
  • 3.
  • 4.
  • 5.
  • 6. Land use management = flood plain zoning It restricts development – a problem when there is a shortage of housing It can’t be used in areas that are already urbanised There are no new buildings or roads on the flood plain to be damaged so the impact of any flooding is reduced It provides recreational opportunities Planning restrictions prevent buildings or roads being constructed on the flood plain. Use of the floodplain is restricted to things like playing fields, allotments or parks. More water can infiltrate grassy surfaces so there is less surface run off which reduces discharge and flooding Disadvantages Extra benefits How it works
  • 7. Wetland and river bank conservation Less land is available for farming Vegetation protects against soil erosion Vegetation creates wildlife habitats Wetlands store flood water and also slow it down. This reduces flooding downstream. Conserving or re-establishing wetlands gives natural protection from flooding. Planting trees and shrubs along the river bank increases interception and lag time and reduces discharge. This also decreases flooding (= riparian buffers) Disadvantages Extra benefits How it works
  • 8. River restoration Local flood risk can increase especially if nothing is done to prevent major flooding Little maintenance is needed as the river is left in its natural state The river provides a better habitat for wildlife Making the river more natural – e.g. by removing man made levees and allowing the river to flood naturally. As the water spreads out over the floodplain, the river’s discharge is reduced which reduces the flooding risk downstream Disadvantages Extra benefits How it works
  • 9.
  • 10.
  • 11.
  • 12. How can the risk of flooding be reduced? Control LAND USE Stop people building on the floodplain Plant trees to increase interception and infiltration
  • 16. Flood protection *Dams *reservoirs *straighten channels *Dredging *levees and embankments *land use zoning *afforestation plenary The challenge: to talk for sixty seconds on one of the flood control measures without any hesitation, repetition or deviation.
  • 17.
  • 18.