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
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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

FLOODSThe river overflowed in several places and huge areas of farming land

What causes Floods?Heavy rainfallHuge snow meltingFailures of dams , barrages etc.,Landslides causing

The Two Main Floods Flash floodsFlash floods occur when heavy

Where Do Floods Often Occur?Floods occur all over the world, except for

Destruction by FloodsFloods can cause major structural damage to buildings, kill plants

Other FactsFloods account for 40% of all deaths caused by natural disasters.In

Слайды презентации

Слайд 2 Floods
Are the result of prolonged rainfall from a

FloodsAre the result of prolonged rainfall from a storm , rapid

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

FLOODSThe river overflowed in several places and huge areas of farming

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

What causes Floods?Heavy rainfallHuge snow meltingFailures of dams , barrages etc.,Landslides

, 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

Where Do Floods Often Occur?Floods occur all over the world, except

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

Destruction by FloodsFloods can cause major structural damage to buildings, kill

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 8 Destruction by Floods

Слайд 9 Other Facts
Floods account for 40% of all deaths

Other FactsFloods account for 40% of all deaths caused by natural

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