a prolonged period of time when rainfall is below average for that area
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why do water supplies (lakes and rivers) deplete during drought?
people keep using them by they are not replenished by rainfall, high temp increases evaporation
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what are the climate conditions that cause drought?
changes in atmospheric circulation- means it doesn't rain much in an area for years, the annual rains fail, high pressure weather systems block depressions
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what are anticyclones?
high pressure weather systems
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what are depressions?
weather systems that cause rain
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why do people not move away from areas of drought?
always lived there, family, friends, job, don't think it will happen again
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4 primary impacts of drought?
vegetation and crops die, people and animals die from dehydration, aquatic animals die, soil dies and is easily eroded
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8 secondary impacts of drought?
death from starvation, shortage of food, desertification, conflicts over water supplies, unemployment, wildfires, psychological, dust storms
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what human activities increase the impacts of drought?
over grazing- reduces vegetation, soil erodes. excessive irrigation- uses up water, when it evaporates it leaves salts in which crops dont grow well
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why are impacts of drought more severe in LEDCs?
people depend on farming- livestock and livelihoods, they have less money to respond
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5 ways to reduce impacts of drought?
prediction, farming techniques, water conservation, increase water supplies, aid
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reducing impacts - prediction
monitoring rainfall, soil moisture and river levels- ban hosepipes, rationing water, move people
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reducing impacts - farming techniques
drought resistant crops- millet, olives, and more efficient methods of irrigation- drip irrigation to roots (reduce evaporation)- expensive
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reducing impacts - water conservation
low volume flush, showers, water butts to collect rainwater for garden and car
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reducing impacts - increase water supplies
build reservoirs, wells - deplete ground water supplies so less in the future and down river (not sustainable)
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reducing impacts - aid
emergency aid bring food and water, fund development- build wells, water pipes
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Other cards in this set
Card 2
Front
why do water supplies (lakes and rivers) deplete during drought?
Back
people keep using them by they are not replenished by rainfall, high temp increases evaporation
Card 3
Front
what are the climate conditions that cause drought?
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