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The River Exe - Coggle Diagram
The River Exe
Peatland restoration
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Involves Southwest water, The Environment agency and Exeter University.
Fills the drainage ditches with peat, slowing down the flow of water.
As the water flows slower, it picks up less sediment and silt. This make sit 20% cheaper to treat the water for human use.
The regulation of flows, makes the catchment less flashy, reducing the risk of flooding.
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As the peatland stays wet, it doesn't oxidize, reducing the amount of CO2 entering the atmosphere as peat is very rich in carbon.
Encourages the growth of sphagnum moss, which acts as a sponge.
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Flood risk
Only 13% of land is woodland - less interception and evapotranspiration, more run-off increases flood risk.
Only 2.5% of all bedrock has high permeability. Less percolation, so the soil will reach its water capacity quickly, increasing run-off.
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11,000 properties at risk of flooding
Exeter and Exmouth have the highest flood risk as they are urban areas (non-permeable rock & down the course of the river)
Physical characteristics
Source in the hills of Exemore, flows south to Devon.
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Maximum Altitude of 516m - steep slopes increases surface runood, reducing lag-time.
Agriculture
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Livestock compact the soil due to their weight, which stops it form holding as much waster
Infiltration capacity of soil reduces, increase rapid surface runoff.
Wimbleball reservoir
Abstraction of water for human use,
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Urbanisation
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Exeter is a small city, increasing the rates of runoff and risk of flooding.