Flashcards in Chapter 4- Flooding Deck (9)
What is flooding?
A flood occurs when a river has too much water in its channel so it spills onto the surrounding land
Causes of flooding (physical factors) ?
Strong winds in coastal areas
Ice or snow melts
Causes of floods ( human )?
Building in the drainage basin
What are the effects of flooding?
Homes - furniture destroyed, costing money and insurance is expensive
Farm animals may drown
Crops are destroyed- this means people may starve
Sewage systems overflow- drinking water is contaminated
Travel and transport can be disrupted
How are floods prevented?
Planting trees in the river basin- trees break rainfall and use up water
River channels are made larger by DREDGING- so they can hold more water
Walls called flood embankments are built to increase height
Flood relief(by-pass) channels are built around towns.
What is a flash flood?
A flash flood is a flood that happens suddenly with little warning.
Why are flash floods dangerous?
They happen so quickly people can't prepare
What are the causes of flash floods?
Intense / heavy rainfall
Dam breaking/ failing