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Pickering Case Study - Coggle Diagram
Pickering Case Study
Background Information
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Main river is the River Derwent which is fed from the moors, Pickering Beck is a tributary of this river
Pickering beck flooded in 1999, 2000 and 2007. In 2007 89 properties and the A170 were flooded
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Flood Management
Strategies
Flood Plaining - A culvert was built to slow the water in times of high flow and force it to flood the land above Pickering creating a water storage area.
Afforestation - 40,000 trees planted to reduce the water that reaches the river by interception, infiltration and reduced surface flow.
Education - Local farmers educated in how to change farming practices so that they can have a smaller impact on the hydrological cycle. e.g. ploughing against hill slopes.
No Burn Buffer Zones - Heather burning is part of traditional moorland management but it removes vegetation and speeds up runoff. Zones have been created along the river in the upper catchment.
Debris Dams - Obstacles like twigs dam the rivers. They reduce the discharge in times of peak flow. 167 were built. Beavers have been released to increase dam creation.
Hard engineering is not an option in Pickering to stop flooding as it would have impacts downstream in Malton
Slowing the Flow
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National pilot project aimed at reducing peak discharge through Pickering and Sinnington using land management
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The land with management taking place is 1/3 public ownership, allowing changes to be easily made
Benefits include improved water quality, increased biodiversity and community involvement
Durham university developed a computer simulation model to see how the tributaries react to rainfall events before and after the intervention
Main principles are to store water in the middle of the catchment, slow the water at the top of the catchment and to improve water flow through the bottom of the catchment
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Causes of Flooding
Physical
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Significant river courses including the Derwent, Rye, Dove, Sever and Costa Beck
Human
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Land drainage on the moors surrounding the valley and movement along the springline make it more susceptible to flooding