1 Recognise the command terms


Topic: Rivers & Coasts Case Study



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Case Study - All Combined Studies
Topic: Rivers & Coasts
Case Study: MEDC Flood Management
Location: Boscastle, Cornwall
Geographical Keywords
• Flash flood
• Canalisation
Saturated ground
• Urbanisation
• Interception
Surface runoff
Case Study Detail
Background In August 2004 the small coastal village of Boscastle in Cornwall was devastated by a flash flood. Within minutes, river levels rose and the 3 rivers that flow through Boscastle burst their banks, creating a mph tide of water through the village. The flood was caused because of a number of factors
1. Saturated ground from a very wet summer
2. A single August storm releasing 1.400 million litres in 2 hours
3. Urbanisation in Boscastle and the small river channel. Damage included

25 business properties destroyed

50 buildings flood damaged

4 footbridges washed away
• Visitor centre destroyed
• Cars and vans washed away

£20 billion repair bill Management Since the flood a £4.6 million flood defence scheme was put in place which included
• A widened river channel
• Lower riverbed by an average m
New flood defence walls
• Raise car parks
• Remove dead trees and vegetation riverbanks Wider river channel upstream to create slow flow and allow deposition of larger sediment
• Encourage landowners to maintain vegetation cover on valley sides to increase interception and reduce surface runoff.



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