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Презентация на тему Floods
Содержание
- 2. FloodsAre the result of prolonged rainfall from
- 3. FLOODSThe river overflowed in several places and
- 4. What causes Floods?Heavy rainfallHuge snow meltingFailures of
- 5. The Two Main Floods Flash
- 6. Where Do Floods Often Occur?Floods occur all
- 7. Destruction by FloodsFloods can cause major structural
- 8. Destruction by Floods
- 9. Other FactsFloods account for 40% of all
- 10. Скачать презентацию
- 11. Похожие презентации
FloodsAre the result of prolonged rainfall from a storm , rapid melting of large amounts of snow , or rivers which rise up their levels of water
Слайд 3
FLOODS
The river overflowed in several places and huge
areas of farming land are now several feet under
water . Boats are being to rescue people in nearby villages.
Слайд 4
What causes Floods?
Heavy rainfall
Huge snow melting
Failures of dams
, barrages etc.,
Landslides causing blockage of river
Deforestation
Storms in the
sea
Слайд 5
The Two Main Floods
Flash floods
Flash
floods occur when heavy rainfall persists for only a
short time period (usually only a few hours), yet can cause major damage and death due to their sudden arrival.Flash floods can also be caused by dam bursts or overflows.
Riverine floods
Reverine floods occur when water rises above its natural banks, often caused by snowmelts in combination with prolonged and heavy precipitation.
Riverine floods take days, weeks, or months to rise to its max and return to normal, much longer than it takes a flash flood to.
Слайд 6
Where Do Floods Often Occur?
Floods occur all over
the world, except for in Antarctica. Highlands are also
unlikely to be struck by flooding.They often occur in urban areas where water cannot drain into the soil properly.
Floods usually affect floodplains, low lying, flat areas near large bodies of water.
Слайд 7
Destruction by Floods
Floods can cause major structural damage
to buildings, kill plants and animals, destroys habitats, and
removes soil.Floods cause many deaths and drown many plants and crops, and hundreds of millions of dollars in damage.
Many nutrients in topsoil are brought downstream deposited in the ocean.
Слайд 9
Other Facts
Floods account for 40% of all deaths
caused by natural disasters.
In an average year, floods account
for about 200 deaths and $2 billion of damage in the U.S. alone.In 1937 floods removed 300 million tons of topsoil in the Ohio Valley.
The flood of Huang river of 1887 killed over a million people
