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  • Created by: Katie_
  • Created on: 17-02-14 14:32
What were the effects of the 2007 floods?
-11 people killed -Roads damaged, bridges collapsed -Farm animals drowned or trapped -Emergency services all strained to breaking point -£3 billion in insurance claims -35,000 homes damaged -Homes lost power because the local power stations flooded
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Soft Engineering
Flood abatement=Change land use upstream (e.g. Planting trees),This delays the passages of water into rivers by interception and transpiration
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Flood proofing=Design new buildings or alter existing ones to reduce flood risks, Only affects new buildings; can be expensive to alter existing buildings
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Flood plain zoning=Refuse planning permission where flood risk is high, Not as many homes flooded, It phases out development in risk areas. Restricts permission to certain uses e.g. Leisure centres
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Flood prediction and warning=The environment agency monitors rivers and uses forecasts from the Met Office,Accurate predictions help to reduce flood damage and evacuate people
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Hard Engineering
Build flood banks=Raise the banks of a river to increase its capacity,Fairly cheap, Disperse water quickly and increases flood risk downstream
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Increase the size of the river channel=Dredge the river to increase its capacity, or lineit with concrete to speed up the flow of water,Speeding up the water can increase flood risk downstream,lining it is expensive and dredging has to be done yearly
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Divert the city away from the city centre=Create a diversion for excess water to avoid flooding the city centre,It costs £14 million for a 1km stretch.
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Increase the size of the drains=Dig up every major road into Sheffield and enlarge the major drains,Gets runoff away from the city, It is only as good as the capacity of the river to take all the water from the drains.
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Maintain the rivers=Clean rivers, drains and sewers to remove debris or vegetation,This needs to be done every year; it can be expensive.
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Flood abatement=Change land use upstream (e.g. Planting trees),This delays the passages of water into rivers by interception and transpiration

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More Soft Engineering

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