BOSCASTLE FLOOD CASE STUDY BBC

Boscastle flood Emergency services on the scene of the flooded village of Boscastle. It remains over the area for about six hours. Boscastle is a small coastal settlement in the south west of England. Flood management case study: This limited interception and water went straight into the river channel.

Animation of Satellite images Flash Player required. Steep valley sides – water flowed into the river channel very quickly. It remains over the area for about six hours. The rock in the local area is slate which does not allow percolation. A large quantity of water arrived within a short space of time causing the rivers to overflow. 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. Tree management – dead trees were removed to prevent them being swept away, causing blockages under bridges.

The drainage basin of Boscastle is steep and impermeable rock. Human Impacts There was a huge financial cost to the floods. Both overflowed, and this caused a sudden rush of water to speed down the Valency — which runs through the middle of Boscastle.

Flood management case study: Boscastle is at the confluence of three rivers – Valency, Jordan, and Paradise. The soils were quite thin and made up of impermeable peat soils. Rainfall rates of at least 32 mm per hour are being measured.

boscastle flood case study bbc

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. The line labelled known as a trough line caused very heavy rain and thunderstorms.

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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. In Augustthe village of Boscastle saw a month’s worth of rain fall in two hours.

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Boscastle is a small coastal settlement in the south west of England. There is more about surface pressure charts in the weather section of the Met Office website. The rainfall rate key shows how the colours in the image relate to the rate the rainfall is falling. Many trees had been cut down for farming.

The thickest cloud is shown by the brightest white areas on the picture. Satellite image The thickest cloud is shown by the brightest white bbbc on the picture. The rock in the local area is slate which does not allow percolation. Destruction of houses, businesses and gardens Floodwater gushed into houses, shops and pubs.

This limited interception and water went straight into the river channel. Weather chart Fig 1. Radar imagery Fig 2. A line of convergence formed near the coast line, where air moving in almost opposite directions flooc, this helped to increase the boscastls of ascent and produced very heavy rain. These factors led to a flash flood which caused over one thousand homes, cars and businesses to be swept away and damaged. The wind is blowing anticlockwise about the low pressure area, so the air is arriving into Boscastle from a south-westerly direction.

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Residents had little time to react. The pictures show cloud forming over Boscastle at about 1 p.

The flooding also had several other key impacts on Boscastle and its inhabitants. 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.

Animation of rainfall radar. Prince Charles, who is the Duke of Cornwall, made a large donation to a fund to help rebuild parts of Boscastle. The Environment Agency is responsible for warning people about floods and reducing the likelihood of future floods.

For example, the red areas indicate that rain is falling at between eight and 16 mm per hour.

Case Study – Boscastle Floods

Huge amounts of water from this sudden downpour flowed into two rivers, the Valency and Jordan which flows into the Valency just above Boscastle. The bridge acted like a dam and eventually smashed through causing a surge of water up to 5m high.

boscastle flood case study bbc

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