Human Impacts There was a huge financial cost to the floods. We are investing in new ways of predicting heavy rainfall events on a small scale to produce better warnings. Severe floods in and Confluence of three rivers: Removing low bridges and replacing them with wider bridges – this meant large amounts of water could flow freely underneath the bridge and the bridge wouldn’t act like a dam in the flood, vegetation and debris became blocked, creating the effect of a dam. Flooding On the day of the flood, about 75mm of rain fell in two hours — the same amount that normally falls in the whole of August. Responses to the flooding John Prescott, the Deputy Prime Minister, and Prince Charles visited members of the emergency services and the local GP surgery, which acted as the emergency centre, in the days following the disaster.
Weather chart Fig 1. The drainage basin of Boscastle is steep and impermeable rock. Hundreds killed Millions made homeless Contaminated water led to disease. The wind is blowing anticlockwise about the low pressure area, so the air is arriving into Boscastle from a south-westerly direction. Prince Charles, who is the Duke of Cornwall, made a large donation to a fund to help rebuild parts of Boscastle.
The effects of and responses to floods vary between areas of contrasting levels of wealth.
Major incident declared at 5pm. Radar imagery Fig 2. Huge amounts of water from this sudden downpour flowed into two rivers, the Valency and Jordan which flows into the Valency just above Boscastle. We are investing in new ways of predicting heavy rainfall events on a small scale to produce better warnings. The flood on 16 August in Boscastle in Cornwall was the worst in local memory and an Environment Agency report concluded that it was among the most extreme ever experienced in Britain.
Cars were swept out to sea, buildings were badly damaged and people had to act quickly to survive. A line of very heavy rain starts at about 1 p.
About two billion litres of water then rushed inpacts the valley straight into Boscastle. Weather chart Fig 1. Physical Impacts Impachs On the day of the flood, about 75mm of rain fell in two hours — the same amount that normally falls in the whole of August. Satellite image The thickest cloud is shown by the brightest white areas on the picture.
Deforestation in Himalayas Ganges diverted for irrigation increasing silt deposition Rapid unplanned urbanisation in Dhaka.
Rivers and flooding – Revision 3 – KS3 Geography – BBC Bitesize
The thickest cloud is shown by the brightest white areas on the picture. Small catchment area about 23km2 Impermeable upland area Bodmin Moor Steep-sided valleys Extremely wet summer, by August ground was saturated. Download the free PDF resource.
Don’t show this message again. It is a warm and moist tropical maritime air mass. Raising the car park and using a permeable surface – this allowed cars to be much higher and so they were less likely to be swept away. Destruction of houses, businesses and gardens Floodwater gushed into houses, shops and pubs.
The church was filled with six feet of mud and water. Severe floods in and Confluence of three rivers: The pictures show cloud forming over Boscastle at about 1 p. Map of the area affected What happened to cause this event?
Extract The flood on 16 August in Boscastle in Cornwall was the worst in local memory and an Environment Agency report concluded that it was among the most extreme ever experienced in Britain. Both overflowed, and this caused a sudden rush of water to speed down the Valency — which runs through the middle of Boscastle.
Physical Impacts Fllod to stdy flooding What happened to cause this event? There was a combination of human and physical causes contributing to a series of effects and impacts.
The Environment Agency is responsible for warning people about foood and reducing the likelihood of future floods. Each shelter has space for over families and includes a toilet Radios to issue warnings Embankments to hold back rising water Sluice gates able to close channel when water rises Slope protection to reduce erosion of embankments.
Village built at the confluence of the River Jordan and the River Valency. Building along river Construction of small bridges across river trapped material behind them creating small dams River narrowed through Boscastle reducing capacity Deforestation in valleys.
Case Study – Boscastle Floods
Prince Charles, who is the Duke of Cornwall, made flopd large donation to a fund to help rebuild parts of Boscastle. Floods dramatically affected earnings. Flood management case study: Gardens and pavements destroyed by weight of floodwater.