Boscastle flood- case study

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Boscastle, UK (2004)

Causes

  • Over 60 mm of rainfall (typically a month's rainfall) fell in two hours.
  • The ground was already saturated due to the previous two weeks of above average rainfall.
  • The drainage basin has many steep slopes, and has areas of impermeable slate causing rapid surface run-off.
  • Boscastle is at the confluence (where tributaries

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