definition 112 causes, effects and control measures of


  DISASTER MANAGEMENT: FLOODS



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Chapter5(1)

5.6

 

DISASTER MANAGEMENT: FLOODS,



EARTHQUAKES, CYCLONES, LANDSLIDES

The Indian subcontinent is very vulnerable to

droughts, floods, cyclones, earthquakes, land-

slides, avalanches and forest fires. Among the

36 states and Union territories in the country,

22 are prone to disasters.

Among all the disasters that occur in the coun-

try, floods are the most frequently occurring

natural disasters, due to the irregularities of the

Indian monsoon. About 75 percent of the an-

nual rainfall in India is concentrated in three to

four months of the monsoon season. As a re-

sult there is a very heavy discharge from the

rivers during this period causing widespread

floods. Approximately 40 million hectares of land

in the country has been identified as being prone

to floods. Major floods are mainly caused in the

Ganga-Brahmaputra-Meghna basin which car-

ries 60 percent of the total river flow of our coun-

try.


India has a long coastline of 5700 kms, which is

exposed to tropical cyclones arising in the Bay

of Bengal and the Arabian sea. The Indian Ocean

is one of the six major cyclone prone regions of

the world. In India, cyclones occur usually be-

tween April and May and also between Octo-

ber and December. The eastern coastline is more

prone to cyclones as it is hit by about 80 per-

cent of the total cyclones generated in the re-

gion.


Droughts are a perennial feature in some states

of India. Sixteen percent of the country’s total

area is drought prone. Drought is a significant

environmental problem as it is caused by a lower

than average rainfall over a long period of time.

Most of the drought prone areas identified by

the Government lie in the arid and semi-arid

areas of the country.

Earthquakes are considered to be one of the

most destructive natural hazards. The impact of

this phenomenon occurs with so little warning

that it is almost impossible to make prepara-

tions against damages and collapse of buildings.

About 50 to 60 percent of India is vulnerable to

seismic activity of varying intensities. Most of

the vulnerable areas are located in the Hima-

layan and sub-Himalayan regions.


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