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  1. www.bbc.co.uk › news › science-environment-57969877Extreme weather: What causes flash flooding? - BBC News

    Oct 5, 2021 · Flash floods usually happen during intense rainfall - when the amount of water is too much for drains and sewers to deal with. It can occur very quickly and without much warning. Roads can...

  2. www.bbc.com › news › science-environment-57969877Extreme weather: What causes flash flooding? - BBC

    Oct 5, 2021 · Flash floods usually happen during intense rainfall - when the amount of water is too much for drains and sewers to deal with. It can occur very quickly and without much warning. Roads can...

  3. www.metoffice.gov.uk › rain › flash-floodsWhat causes flash floods? - Met Office

    • What Are Flash Floods?
    • What Causes Flash Floods?
    • Case Study: Boscastle Floods in 2004

    Flash flooding happens when rain falls so fast that the underlying ground cannot cope, or drain it away fast enough. Roads can become like rivers and if there is a lot of water, it can flood buildings and carry cars away. So, if the rain is falling too fast for the ground or drains to cope, there is a risk of flash flooding.

    See full list on metoffice.gov.uk

    Most rivers flow fairly gently as they slope slowly towards the sea. Therefore, when a river floods it does so quite slowly as it takes time for the rain to percolate through the ground and into the rivers and out to sea, allowing time for some warning. With flash flooding, there is often very little time between the rain falling and flash flooding...

    See full list on metoffice.gov.uk

    The village of Boscastle in Cornwall experienced flash flooding on 16 August 2004 when an exceptional amount of rain fell over eight hours. Heavy thundery showers developed over the moors to the southwest of Boscastle. A small, steep river flows through Boscastle and the thundery showers came one after another in a short space of time, over the sam...

    See full list on metoffice.gov.uk

  4. www.bbc.co.uk › newsround › 55738435Flooding: What is it and what are the different types?

    Jan 20, 2021 · Flash floods are floods that happens very quickly in low-lying land, and they're usually caused by very heavy rain, or when water can't be absorbed quickly enough. Why doesn't the ground soak...

  5. www.gov.uk › guidance › flash-floodingFlash flooding - GOV.UK

    Nov 11, 2013 · Flash flooding is a very dangerous type of flooding. It happens when a lot of heavy rain falls in a short period of time: onto the ground. into a river or stream. This can create deep,...

  6. en.wikipedia.org › wiki › Flash_floodFlash flood - Wikipedia

    A flash flood is a rapid flooding of low-lying areas: washes, rivers, dry lakes and depressions. It may be caused by heavy rain associated with a severe thunderstorm, hurricane, or tropical storm, or by meltwater from ice and snow.

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  8. theconversation.com › what-is-a-flash-flood-aWhat is a flash flood? A civil engineer explains

    Aug 2, 2022 · Flash flooding is a specific type of flooding that occurs in a short time frame after a precipitation event – generally less than six hours. It often is caused by heavy or excessive rainfall...

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