Flooding Flashcards
1
Q
What is flood frequency? (Flooding rivers)
A
How often the flood occurs
2
Q
What is flood magnitude? (Flooding rivers)
A
The size of the flood
3
Q
What is recurrence interval? (Flooding rivers)
A
The interval at which particular flood levels will occur
4
Q
How do you work out the recurrence rate? (Flooding rivers)
A
recurrence (T) = number of years of record (N) + 1 / the rank order (M)
5
Q
Why would the Thames Barrier shut? (Flooding rivers)
A
Under storm surge conditions to protect London from flooding
6
Q
What are the 5 main causes of flooding? (Flooding rivers)
A
- High discharge
- Prolonged rainfall
- Heavy rainfall
- Snow melt
- Steep relief
7
Q
What are some physical causes of flooding? (Flooding rivers)
A
- Sparse vegetation
- Impermeable ground
- Small drainage basin
- High drainage density
8
Q
What are some human causes of flooding? (Flooding rivers)
A
- Urbanisation
- Deforestation
- Flood management strategies
- Climate change
