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What Is A Disaster

A disaster is defined as a destructive event that causes great damage or loss of life suddenly. Disasters can be natural, caused by events like earthquakes, floods and droughts outside of human control, or man-made, triggered by human actions like bomb explosions or industrial accidents. Natural disasters result from natural processes, while man-made disasters are caused by human activities. Common natural disasters include earthquakes, floods, and droughts, while man-made disasters involve bombings, pollution, and infrastructure failures.

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101 views4 pages

What Is A Disaster

A disaster is defined as a destructive event that causes great damage or loss of life suddenly. Disasters can be natural, caused by events like earthquakes, floods and droughts outside of human control, or man-made, triggered by human actions like bomb explosions or industrial accidents. Natural disasters result from natural processes, while man-made disasters are caused by human activities. Common natural disasters include earthquakes, floods, and droughts, while man-made disasters involve bombings, pollution, and infrastructure failures.

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DebasisBarik
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WHAT IS A DISASTER ?

A disaster is a destructive event that occurs suddenly and involves loss of life and
property.
Disasters can be of two types, natural and man-made. It is a sudden accident or a
natural catastrophe that causes great damage or loss of life.

TYPES OF DISASTERS
Disasters can be of two types, natural and man-made.

NATURAL DISASTERS
Earthquakes, volcanic activity, tsunamis, floods, cyclones, landslides, avalanches
and droughts are natural disasters and man has no control over them. They are a
result of natural activities and hence known as natural disasters .

MAN MADE DISASTERS


The man-made disasters are triggered by human beings. Some of the man-made
disasters are: bomb explosions, terrorism, war or civil war, leakage of poisonous
chemicals, breach in dams, air or water pollution, industrial accidents and epidemics.
They are known as man made disasters because they occur due to human actions
and not natural forces.

EARTHQUAKES
An earthquake is a sudden tremor or movement of the earth’s crust, which usually
originates at or below the surface. The outer layer of the earth is solid and is divided
into many sections known as plates. The point of origin of the earthquake within the
crust or mantle is called the seismic focus. Since the focus is often deep below the
surface, the location of the earthquake is often referred to as the point on the surface
of the earth, vertically above the seismic focus. This point is called the epicentre.
PROTECTION AGAINST EARTHQUAKES
 The information about earthquakes and their intensity should be shared with
the public through radio, television and newspapers
 Construction of buildings based on earthquake-resistant techniques .
 Construct buildings over pillars made of concrete and iron that are built deep
in the ground
 Water, ration, first-aid kits, radios, flash lights, battery, blankets, jackets and
fire extinguishers should be stored in safe places.
 If inside a building or a house, take cover under a solid surface like a table, or
stand in the doorway
 If one is outside, move to an open space away from trees, electric poles and
buildings .
 Switch off the gas and electric supply in the house during a quake and do not
use elevators .
 After the quake is over, the affected people should be given immediate
medical help .
 Transport and communication facilities should be restored as soon as
possible .

FLOODS
 A flood is an overflow of a large amount of water beyond its normal limits,
especially over what is normally dry land.Flooding may occur as an overflow
of water from water bodies, such as a river , lake, or ocean, in which the water
overtops or breaks leeves , resulting in some of that water escaping its usual
boundaries

PROTECTION AGAINST FLOODS


 Floods caused by cloud bursts, bursting of dams, or tsunamis are called flash
floods. Any flood is preceded by a threat period known as the Probability
Period. This allows the authorities to issue warnings and plan evacuation.
 Artificial reservoirs should be built with sluice gates and sand bags should be
used to block the flow of water. Low grounds or viaducts can be created to
carry water in a certain direction or underground. Trees should be planted in
the catchment areas to stop soil erosion .

DROUGHTS

A drought is a period of below-average precipitation in a given region, resulting in


prolonged shortages in its water supply, whether atmospheric, surface water or
ground water.It can have a substantial impact on the ecosystem and agriculture of
the affected region and harm to the local economy .Diminished crop growth or yield
productions and carrying capacity for livestock

CAUSES of Drought

Lack of rainfall (or precipitation) Droughts can occur when there is the lack of
‘expected’ precipitation (rain and snow)

Surface water flow

Some regions are also well distributed with surface water (streams and rivers) that
have their sources from far away mountains and watersheds. These surface waters
may dry out if the flow from their sources upstream is affected.

Global Warming

Even though some people do not accept that the average temperature of the earth
has risen, it is on record that human actions have contributed to more greenhouse
gasses in the atmosphere. As a result, there are warmer temperatures, often
resulting in more dryness and bush fires often causing drought conditions .

EFFECTS OF DROUGHTS
Diminished crop growth or yield productions and carrying capacity for livestock

Dust bowls, themselves a sign of erosion, which further erode the landscape

Dust storms, when drought hits an area suffering from desertification and erosion

Famine due to lack of water for irrigation

Habitat damage, affecting both terrestrial and aquatic wildlife

Hunger, drought provides too little water to support food crops.

Malnutrition, dehydration and related diseases

Mass migration, resulting in internal displacement and international refugees

Reduced electricity production due to reduced water flow through hydroelectric


dams[45] of water for industrial users

Social unrest

War over natural resources, including water and food

PROTECTION AGAINST DRAUGHTS

Strategies for drought protection, mitigation or relief include:

Dams – many dams and their associated reservoirs supply additional water in times
of drought .

Desalination – of sea water for irrigation or consumption.

. For instance, analysis of water usage in Yemen has revealed that their water table
(underground water level) is put at grave risk by over-use to fertilize their Khat crop.

Land use – Carefully planned crop rotation can help to minimize erosion and allow
farmers to plant less water-dependent crops in drier years.

Outdoor water-use restriction – Regulating the use of sprinklers, hoses or buckets on


outdoor plants, filling pools, and other water-intensive home maintenance tasks.

Rainwater harvesting – Collection and storage of rainwater from roofs or other


suitable catchments.

Recycled water – Former wastewater (sewage) that has been treated and purified for
reuse.

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