Global Hazards 2 Flashcards
What is a drought
A long period of time when rain fall is below average
What are the causes of droughts
-Change in atmospheric circulation ( el Nino and La Niña )
-high pressure weather systems
What is a flash flood
When lots of water suddenly flows into a river causing it to overflow its banks
When was the flash flood in boscastle
16 august 2004
How much water fell on boscastle
75mm in 2 hours
What causes the flash flood in boscastle
-A low pressure brought warm air from Atlantic Ocean
-boscastle is in a steep sides valley
-near confluence of three rivers
What were the consequences of boscastle flash flood
-58 properties, 4 businesses destroyed
-50 cars washed out to sea
-number of tourism dropped as 90% of income was from tourism
What were some responses to the boscastle flash flood
-100 people has to be airlifted to safety
-£10 million pound flood defence scheme
What part of Australia did the millennium drought affect
South east Australia
What were the causes of the big dry
El Niño
Climate change
What were some consequences of the big dry
Water levels ran low
Livestock died
Farmers income fell
What were some responses to the big dry
-Water storage measures introduced
