Karteikarten
Boscastle
Karten in diesem Stapel (5)
- 1LocationBoscastle is a small village found in the South-West of England, near the Bristol Channel, along the coast.
- 2WhenThe flooding in Boscastle happened on the 16th August 2004.
- 3CausesFlash floods which happened after a massive amount of rain fell in just eight hours that afternoon.
· A 2m rise in river levels in just one hour, causing the river to burst its banks.
· Large amounts of impermeable surfaces.
· Bridges over the river reduced its flow.
· Heavy rain
o 8.9 cm in an hour
o 2.4 cm in 15 min
· River speed
o Excess of 4m/sec
o 2m rise in 1 hour
· Warm climate à frontal rain
· Narrow river à hold small amounts of waterà build up of waterà no where to go à flood
· Impermeable surfacesà surface run off à increase risk of flooding
· Small drainage basin + steep slopes à increase risk of flooding
· Climate – low temperatures means a low evaporation rate. - 4Effects· 75 cars damaged
· 5 caravans washed into the sea
· 6 buildings washed into the sea
· Contamination of water with sewage
· 100 homes/buildings damaged beyond repair
· 90% of economy was based on tourism=loss of revenue
· Insurance costs went up. - 5River managementBarriers or dams put in to control the river’s flow.
· Raising the banks (creating levees) of the river, and widening and deepening the river to increase the amount of water it can hold.
· Zoning – only allowing people to build along certain parts of the river to reduce the amount of impermeable surfaces.
· Afforestation to increase the amount of interception and therefore storage of water, meaning the there is less water in the river so the risk of flooding is decreased.
· River widened and lowered=increased capacity =could hold more water
· Overflow Culverts put in place to re-direct excess water
· Underground pumps put in place so flood water couldn’t mix with sewage
Informationen
- Beschreibung
- GCSE Geography (Know) Karteikarten am Boscastle, erstellt von Molly Atkinson am 29/05/2013.
- Erstellt von
- Molly Atkinson
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