Rain for 12 out of 14 days in August. Many trees had been cut down for farming. People in LEDCs cannot afford home insurance so they lose everything. The flooding coincided with a high tide, making the impact worse. The drainage basin of Boscastle is steep and impermeable rock. The ground was already saturated due to the previous 2 weeks of above average rainfall. This limited interception and water went straight into the river channel.
Where did the red mud in Hungary come from? How do steep valley sides affect the flood hydrograph? Lack of any flood control eg; raised banks around river and emergency drainage ditches. This limited interception and water went straight into the river channel. Widening and deepening the river channel – this allowed the river to carry more water. Which part of the flood hydrograph shows how long it takes for rainwater to reach the river? Causes Over 60mm of rainfll fell in 2 hours a typical months rainfall.
This limited interception and water went straight into the river channel.
Tree management – dead trees were removed to prevent them being swept away, causing blockages under bridges. The bridge acted like a dam and eventually smashed through causing a surge of water up to 5m high.
What does a storm hydrograph show? In Augustthe village of Boscastle saw a month’s worth of rain fall in two hours. Approximately permanent residents but more effected due to influx of tourists. Boscastle, Cornwall In Augustthe village of Boscastle saw a month’s worth of rain fall in two hours.
A depression brought a thunderstorm on 16 August with over mm of rain in 24 hours. Geography Case Studies – Water on the Land. 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.
This had an impact on livelihoods and the local economy. Widening and deepening the river channel – this allowed the river to carry more water. It flooded in Augustwashing cars and buildings into the sea and putting peoples’ lives in danger.
Roads blocked so rescue by helicopter only. Overall summary A small north Cornish town popular with tourists. A large quantity of water arrived within a short space of time causing the rivers to overflow.
A few old arch bridges got blocked boscaztle with the flood debris. Land owners were encouraged to maintain vegetation and plant new trees. These became saturated so water became surface run-off very quickly. Increase in buildings within the drainage basin meant that there more impermeable surfaces which directed water back to the river faster. 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.
River landscapes in the UK – GCSE Geography – BBC Bitesize
The topography of the land. Boscastle is at the confluence of 3 rivers, Valency, Jordan and Paradise. Effects Homes, businesses and cars belonging to more than 1, people were swept away. Rock that does allow water through it.
Old sewer bosczstle drainage system with low capacity. Rain for 12 out of 14 days in August. Causes Over 60mm of rainfll fell in 2 hours a typical months rainfall. There were very few trees to absorb water and slow the amount of water going into the river. They increase the lag time.
MEDC CaseStudy – Boscastle Flooding
Red mud and clay from a river bed. What is impermeable rock? Steep valley sides – water flowed into the river channel very quickly. What caused the Boscastle flood of ?
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