Flooding In Boscastle

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Flooding In Boscastle

  1. 1. Flooding in Boscastle <ul><ul><li>On Monday 16 August 2004, the village of Boscastle in Cornwall suffered one of the worst incidents of flooding in local memory </li></ul></ul>
  2. 2. Maps of Boscastle. Aerial Photo.
  3. 3. <ul><li>Boscastle – what were the causes of flooding? </li></ul><ul><li>Heavy localised rainfall (89mm of rain in an hour) and saturated land so rain likely to infiltrate so water reaches river quicker. </li></ul><ul><li>Topography of the land – the steep valleys upstream of Boscastle act as funnels so there is more surface run off and water reaches the river quicker. </li></ul><ul><li>Narrow river channels in the village itself. </li></ul><ul><li>Impermeable ground made from shale, slate and clay soils means water does not infiltrate. </li></ul><ul><li>Boscastle stands on a confluence of the rivers Jordan & Valency so there was a lot of water passing through village. </li></ul><ul><li>The village bridge constricted the flow of the water through the village, forcing the river to burst its banks. </li></ul><ul><li>The natural channel had been walled so the river couldn’t adjust to the sudden increase in water. </li></ul><ul><li>The village of Boscastle was built on the rivers flood plain. </li></ul><ul><li>The river channel’s capacity had been reduced due to the development of a road and a car park next to the river. </li></ul>
  4. 4. Heavy rain Narrow, steep valley sides & impermeable ground Narrow channel & building on floodplain Saturated land
  5. 5. Practice Question: For an example you have studied in an MEDC – explain the causes of the floods. <ul><li>1 ……....……....…….. and prolonged ……....……....…….. which has not infiltrated the ……....……....… and consequently reached the ……....……....…….. quickly resulting in a rapid increase in river ……....……....…….. </li></ul><ul><li>(rainfall, rivers, discharge, soil, heavy) </li></ul><ul><li>2 The ……....……....…….. of the surrounding landscape is also a contributing factor. Boscastle is in a ……....……....…….. and the ……....……....…….. of the valley are very ……....……....…….. </li></ul><ul><li>(slopes, valley, shape, steep) </li></ul><ul><li>3 In addition to this, the ……....……....…….. in the local area is ……....……....…….. as the underlying ……....……....…….. are mostly shales and slate. </li></ul><ul><li>( impermeable, ground, strata) </li></ul><ul><li>4 Also, Boscastle stands at the ……....……...........…….. of two major rivers, ……...........……....…….. and ……....……............……... A third ……....…......…....…….., Paradise, also flows through the village. </li></ul><ul><li>(river, confluence, Jordan, Valency) </li></ul><ul><li>5 A......................in the village is a man made structure that.......................the flow of the river, giving further cause for flooding as it may have contributed to the river bursting its.......................... </li></ul><ul><li>( banks, bridge, restricts) </li></ul>
  6. 6. Picture: www.cornwall-calling.co.uk EFFECTS OF THE FLOODS
  7. 7. <ul><li>What do you think the immediate effects of the Boscastle floods were? </li></ul><ul><ul><li>Loss of homes </li></ul></ul><ul><ul><li>Loss of businesses </li></ul></ul><ul><ul><li>Loss of possessions </li></ul></ul><ul><ul><li>Injury </li></ul></ul><ul><ul><li>Loss of public services (electricity, water etc.) Around 75 cars and 6 buildings were washed into the sea </li></ul></ul><ul><ul><li>Several boats were lost </li></ul></ul><ul><ul><li>Trees were uprooted </li></ul></ul><ul><ul><li>No loss of life was reported. </li></ul></ul><ul><ul><li>In conjunction with the Royal National Lifeboat Institute (RNLI), a fleet of seven Royal Navy and RAF helicopters rescued 150 people </li></ul></ul>
  8. 8. What do you think the longer term impacts of the Boscastle floods were? <ul><li>About 90% of Boscastle’s economy is tourism and about 2/3 of this income usually occurred during the school holidays. The area had o regenerate tourism in the area. </li></ul><ul><li>20 accomodation providers had to shut – took a long time to re-open. </li></ul><ul><li>Rebuild houses and infrastructure. </li></ul>
  9. 9. Write the title ‘Responses to the floods in Boscastle’ Put the following statements in the order you think they occurred after the flood. Draw a line to separate what you think the short and long term responses to the floods were. People worked together Sand bags put down People put up in temporary accommodation Evacuation 7 Rescue helicopters sent in and saved 150 people. Panic Water, sewage systems and telephone lines were restored. Damaged roads and bridges restored. Debris and silt was cleared from buildings (1850 tonnes in total). People donated money to the Red Cross appeal The relief channel for the River Jordan was made bigger. River banks and flood walls were raised A B C D E F G H I J K L
  10. 10. What’s the Question? – Boscastle floods. <ul><li>For each of the answers below think of a question that will give you that answer. All the questions need to be about the Boscastle floods. </li></ul><ul><li>River Jordan & Valency </li></ul><ul><li>Deforestation </li></ul><ul><li>Flash flooding </li></ul><ul><li>Cornwall </li></ul><ul><li>Sandbags </li></ul><ul><li>7 sea king helicopters </li></ul><ul><li>60mm </li></ul><ul><li>Steep sided valley </li></ul>
  11. 11. Managing the risk of flooding in Boscastle. A £4.5m scheme to improve flood defences.
  12. 12. The scheme stretches along the valley, incorporating drainage, sewerage systems and land re-grading. Boscastle main car park.
  13. 13. Boscastle car park is being raised in height. This will stop the river from bursting it’s banks so easily. The river lies here.
  14. 14. This drain allows water to run into the lower section of the river quickly. Boscastle flood defences.
  15. 15. The river channel is being made deeper and wider so that it can accommodate more water. The lower section of the village.
  16. 16. New sewerage systems are being put in place. The lower section of the village.
  17. 17. Bridges that hindered the drainage of the floodwater are being replaced by stronger bridges that are less likely to get blocked. The lower section of the village. Notice attempts to draw in much needed custom.

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