River Severn Case Study

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factors increasing risk of flooding

Physical

- steep valley sides > increase in SOF > no infiltration

- source - Shrewsbury > many tributaries > higher water conc.

- catchment area above Shrewsbury > slately-shales > impermeable

- winter > waters not absorbed by plants present in summer

Human Impacts 

- agricultural activity > ploughing > troughs > man-made tributaires

- deforestation > land becomes saturated (unable to soak up water)

- bridge buolding > semi dams > water exceeds limit of river > banks burst

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impacts of flooding

Social

- loss of business/trade

- traffic/public transport disruption and congestion

Economic

- damage to property/posessions

- reduction in property values/problems with obtaining insurance

In 2000, November - soils completely saturated > 27000 houses destroyed

despite inundation of large agricultural lands, overflowed embankments

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management strategies

- do nothing > reduce positive feedback

- adapt to hazard > re-design lower floors of buildings

- land-use zoning > restrictions on vulnerable areas

- hard flood defenses > walls/embankments (demountable)

> negative > prevent SOF draining into river > increase height of flood peak elsewhere

- soft flood defenses > open land can store floodwater

- dredging the river > deepen river

- dams/reservoirs > upstream of vulnerable town > store floodwater

Frankwell scheme - combination of stone clad floodwalls/embankments with demountable defences

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stats - July 2007

- £600 million > exisiting flood protection budget for S England

- £1 billion > estimatyed value needed for Environment Agency

- £3 billion > cost of flood damage covered/not covered by insurance

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Comments

Caitlin x

This highlights all the key information and would be great to use as part of your own case study

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