About two billion litres of water then rushed down the valley straight into Boscastle. There were very few trees to absorb water and slow the amount of water going into the river. Tree management – dead trees were removed to prevent them being swept away, causing blockages under bridges. Weather chart Fig 1. The soils were quite thin and made up of impermeable peat soils. The flooding coincided with a high tide, making the impact much worse.
These became saturated so water became surface run-off very quickly. The Environment Agency is responsible for warning people about floods and reducing the likelihood of future floods. A large quantity of water arrived within a short space of time causing the rivers to overflow. Physical Impacts Responses to the flooding What happened to cause this event? Physical Impacts 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. Widening and deepening the river channel – this allowed the river to carry more water.
Steep valley sides – water flowed into the river channel very quickly.
The Environment Agency has carried a major project to increase flood defences in Boscastle, with the aim of preventing a similar flood happening again. Map of the area affected What happened to cause this event? A line of convergence formed near the coast line, where air moving in almost opposite directions collides, this helped to increase the rate of ascent and produced very heavy rain. Flood management case study: The soils were quite thin and made up of impermeable peat soils.
The thickest cloud is shown by the brightest white areas on the picture. Fortunately, nobody died — thanks largely to a huge rescue operation involving helicopters — but there was millions of pounds worth of damage.
Residents had little time to react. About two billion litres of water then rushed down the valley straight into Boscastle. Both overflowed, and this caused a sudden rush of water to speed down the Valency — which runs through the middle of Boscastle.
A few old arch bridges got blocked up with the flood debris. A line of very heavy rain starts at about 1 p.
Floods devastate village On 16 Augusta devastating flood swept through the small Cornish village of Boscastle.
Radar imagery Fig 2. The flooding also had several other key impacts on Boscastle and its inhabitants. 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.
Cars were swept out to sea, buildings were badly damaged and people had to act quickly to survive. Boscastle flood Emergency services on the scene of the flooded village of Boscastle. British Isles case study: These factors led to a flash flood which caused over one thousand homes, cars and businesses to be swept away and damaged.
The drainage basin of Boscastle is steep and impermeable rock.
Rain for 12 out of 14 days in August. The flooding coincided with a high tide, making the impact much worse. Cars, walls and even bridges were washed away. The pictures show cloud forming over Boscastle at about 1 p.
Slide show of photographs of the Boscastle flood.
Physical Impacts Responses to the flooding What happened to cause this event? It is a warm and moist tropical maritime air mass. Human Impacts There was a huge financial cost to the floods. Prince Charles, who is the Duke of Cornwall, made a large donation flold a fund to help rebuild parts of Boscastle.
The rainfall rate key shows how the colours in the image relate to the rate the rainfall is falling. There is more about rainfall radar in the weather section of the Met Office website. Weather chart Fig 1. Boscastle is a small coastal settlement in the south west of England. For example, the red areas indicate that rain is falling at between eight and 16 mm per hour.