• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Boscastle
 

Boscastle

on

  • 7,071 views

 

Statistics

Views

Total Views
7,071
Views on SlideShare
7,057
Embed Views
14

Actions

Likes
0
Downloads
62
Comments
1

1 Embed 14

http://www.slideshare.net 14

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

11 of 1 previous next

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
  • shit
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Boscastle Boscastle Presentation Transcript

    • Boscastle floods
      • Where?
      • Boscastle is a small village on the north Cornwall coastline.
    •  
    •  
    •  
    • Boscastle floods
      • When?
      • The flood occurred on 17 th August 2004.
      • Watch the video and see what effects you can see;
      HUMAN CAUSES PHYSICAL CAUSES
    • PHYSICAL CAUSES
      • Three rivers: Valency, Jordan and Paradise, converge on the village.
      • Heavy rain caused by extreme frontal activity. 3 million tonnes of water added to a small drainage basin of just 40 square kilometres.
      • 185mm of rain in just under 5 hours – infiltration excess overland flow
      • Soils saturated from rainfall earlier in the week encouraged overland flow
      • 3 valleys steep and narrow – broader floodplain would have increased hydraulic radius
      • Soils thin on steep slopes due to mass movement
      • Parent rock is old red sandstone: limited permeability
      • Rivers flashy
      • Surrounding vegetation agricultural land: limited interception storage
      • High tide in the bay – restricted rate of exit of floodwater
      • Settlement developed on narrow flood plain where rainfall is often high – now over 1000 residents
      • Tourist season: population more than doubled – vehicles parked in top car park, and higher levels of stock in the shops
      • No flood defences: new ones built in October 2007
      • Narrow bridges – old stone arched design
      • Difficult to establish casualty figures due to transience of population – difficult for emergency services
      HUMAN CAUSES
      • Use the timeline to look at the effects of the flood
      • Here are some to help you to start of with,
        • Buildings were demolished, including Harbour Lights and Clovelly Clothing.
        • Only 1 casualty (broken thumb) and no deaths
        • Empty vehicles and a footbridge were washed out to sea.
        • Trees were uprooted.
        • 4 footbridges on the Valency washed away (debris dams)
        • 84 cars recovered from harbour, and 32 more ‘lost at sea’…
      Effects of the flood
    • Practice question …
      • With reference to a named specific case study describe and explain the causes of the flood.
      • You may use a diagram to help you.