Rivers CS - Boscastle Flashcards
1
Q
Date of the Boscastle floods
A
16th August 2004
2
Q
How many people died during the floods?
A
0
3
Q
Where is Boscastle?
A
North Cornwall Coast, South West England.
4
Q
How many million gallons of water passed through the river?
A
440 million gallons of water
5
Q
Approximately how likely is the river going to flood?
A
1/400 year event
6
Q
Three rivers which converge to make the confluence at Boscastle
A
Vallency, Paradise, Jordan
7
Q
Geology of the surrounding Boscastle area:
A
Granite
8
Q
How much rain fell into the Vallency at 12 o’clock?
A
8 inches of rain
9
Q
What time did the river burst it’s bank?
A
3pm
10
Q
What time did the water recede?
A
8pm
11
Q
Impacts of flooding:
A
- Tourist center collapsed
- Businesses ruined
- Tourism damaged
- Coast guard had to be scrambled (Second largest air evacuation since world war 2)
12
Q
Causes of flooding:
A
- Deforestation
- Confluence of three rivers
- Granite (impermeable) surrounding geology
- Concrete car parks (impermeable rock)
- Climate change makes rain more frequent in larger amounts
- V shaped valleys
- Large drainage basin
