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Human Causes of Flooding (Urbanisation (Strengthening channels…
Human Causes of Flooding
Climate Change
Some floods are of a higher magnitude than experienced previously
Heavier rains
Higher chance of flooding
Higher intensity rains
Higher chance of flash flooding
River Management
Budget cuts
EU Water Framework Directive
More environmental than anti flooding, so less river management to prevent flooding
Change of land use
Associated with agricultural development
Deforestation, overgrazing, ploughing or drowning wetlands occurs
Usually upstream from urbanised flood plains
Knock on effect downstream
Increased runoff
Increased levels of sediment
Washed into rivers
Block river channels
Deforestation
Less transpiration
Higher runoff
Larger chance of flooding
Urbanisation
Creation of impermeable surfaces
Speeding up drainage of areas through drains and sewers
Impeding channel flow by building alongside river
Strengthening channels (realignment)
Results in flooding downstream
Could be regarded as mismanagement
Resectioning and dredging involves widening and deepening the channel
Increase in efficiency
Increase in capacity
Moving water away at faster rate
Increased environmental cost