Don’t show this message again. The flooding coincided with a high tide, making the impact much worse. Rainfall rates of at least 32 mm per hour are being measured. Causes It happened at high tide. There is more about rainfall radar in the weather section of the Met Office website.
The flash flood was a freak event. Widening and deepening the river channel – this allowed the river to carry more water. There is more about rainfall radar in the weather section of the Met Office website. The combination of high localised temperatures and the great quantity of unabsorbed surface water plus moist winds off the sea caused a great deal of moist, warm air to travel upwards quickly. Boscastle is a small coastal settlement in the south west of England. The pictures show cloud forming over Boscastle at about 1 p.
Case Study – Boscastle Floods
The wind is blowing anticlockwise about the low pressure area, so the air is arriving into Boscastle from a south-westerly direction. The entire South-West of the country had faced stormy weather in the days leading up to the flood on the 16th of August, therefore the ground was saturated. Report Sun 28th October, This is so good. Boscastle’s main industry is tourism. Removing low bridges and replacing them with wider bridges – this meant large amounts of water could dlood 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.
Flood management case study: Boscastle is a small coastal settlement in the south west of England. The rock in the local area is slate which does not allow percolation.
Huge amounts of water from this sudden downpour flowed into two rivers, the Valency and Jordan which flows into the Valency just above Boscastle. Effects Roads were blocked off by the floodwater, making emergency access difficult except from the air.
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. A few old arch bridges got blocked up with the flood debris. Increase in buildings within the drainage basin meant that there more impermeable surfaces which directed water back to the river faster.
The flash flood was a freak event. In Augustthe village of Boscastle saw a month’s worth of rain fall floos two hours.
River management – AQA – Revision 5 – GCSE Geography – BBC Bitesize
Steep valley sides – water flowed into the river channel very quickly. The town was effectively closed to tourists after the flood, causing a massive loss of revenue. Residents had little time to react.
Boscastle is at the confluence of three rivers – Valency, Jordan, and Paradise. Animation of Satellite images Flash Player required.
The steepness of the valley accelerated the rainwater falling on the hills as it travelled down to the valley floor where Boscastle lies. The combination of high localised temperatures and the great quantity bosacstle unabsorbed surface water plus moist winds off the sea caused a great deal of moist, warm air to travel upwards studyy. The Environment Agency has carried a major project to increase flood defences in Boscastle, with the aim of preventing a similar flood happening again.
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. Report Thu 30th May, These geographhy led to a flash flood which caused over one thousand homes, cars and businesses to be swept away and damaged. No flood control system.