Flashcards in Pickering Beck Deck (27):
Where is Pickering?
A market town
Which river is Pickering Beck a tributary to?
When has Pickering been flooded?
1999, 2000, 2007
How much damage did the 2007 floods cause?
Flooded 85 homes, shops and the A170
Why were many of the residents not prepared for the 2007 floods?
A lot of them had never been flooded before
Caused by a day of torrential rain- little preparation time
What is the Beck's catchment like?
Gritstone and limestone
Drains the North Yorkshire Moors, mixed land use
Upper catchment is moorland
Lower catchment is arable
Why is the gritstone partly accountable for the flashy hydrographs of the Beck?
It slowly absorbs water- increases runoff
Why is the steep topography partly responsible for the flashy hydrographs of the Beck?
Rapid runoff from the steep hillsides
How is the agricultural use of the area partly responsible for the flooding?
Overgrazing has compacted the soil- less water can infiltrate
How is urbanisation partly responsible for the flooding?
More impermeable surfaces i.e. tarmac- increases runoff
Drainage systems mean water from precipitation quickly enters the river channel
How is moorland and forest drainage partly responsible for the flooding?
Drainage systems increase the speed at which water reaches the river channel- reducing the lag time
What status is the Beck's water quality failing to meet?
'good water' from the Water Framework Directive
Why is the Beck's water quality not meeting the expected standards?
Chemicals farmers use leak into the river
What policy has the Pickering Flood Management Scheme adopted in 2007?
'Slowing the Flow'
Aims to reduce the peak flow of the beck
Why is a whole catchment approach being adopted to manage flooding?
As it is more sustainable that isolated projects
How much is the flood management project cost?
Which organisations are involved in the flood management project?
What other benefits should the project have?
Improve water quality
Increase community involvement
Why was the Beck's catchment chosen for the project?
Over a third owned by North York Moors National Park and Forestry Commission- easier to instigate change
Which university's computer model has helped the project?
Simulates how tributaries will react to precipitation after intervention- shows where intervention would worsen the problem
Strategies used: Blocking moorland drains
187 heather bale dams installed in moorland drains
Aims to improve water retention
Strategies used: Educating farmers, landowners and homeowners
Teaches them how to avoid rapid overland flow
Farmers taught to move cattle feeders regularly to stop the ground being compacted
Strategies used: No burn zones
Heather burning increases runoff as less interception
10m wide no burn zones established along the main watercourse in the Beck's upper catchment
Strategies used: Woodland creation
Helps protect soils from erosion, and increases infiltration rates- reducing runoff
15 hectares of woodland have been planted
Strategies used: Woodland restoration
Woodland has been restored in the floodplains
Helps reduce peak flows through interception and roots taking up water
Trees planted can withstand the wet conditions of the floodplain and help drain it more quickly after a flood
Advantages of the management scheme?
Cheaper and more environmentally friendly than hard engineering
Risk of flooding in Pickering reduced from 25% to 4%