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Causes of Flooding

Weather events

Flooding is normally caused by natural weather events such as:

  • heavy rainfall and thunderstorms over a short period
  • prolonged, extensive rainfall
  • high tide combined with stormy conditions.

It is also predicted that climate change will increase the risk of flooding in the UK and other parts of the world. The following factors can also cause or contribute to flooding.

Poor maintenance

  • Faulty sewer networks
  • Poor or insufficient drainage networks
  • Inadequate maintenance of watercourses

Development/planning issues

  • Inappropriate development in flood plains
  • Building on land in a way that prevents rainfall from draining away naturally - this includes roads and car parks that are impermeable to water, increasing the risk of flooding from rainwater runoff
  • Flood defence schemes that are defective or badly designed

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