ENVIRONMENTAL SCIENCE AND ENGINEERING, R2013 ANNA UNIVERSITY

1. DISASTER MANAGEMENT
(Flood,earthquake,drought)
BY
SATHYAN S ,
II-CIVIL,
KIOT.

2. DISASTER/CALAMITIES
• It is defined as a sudden accident or a natural catastrophe that causes
a great damage to environment or life.
TYPES:-
1. Natural disaster.
2. Man-made disaster.

3. Natural disaster
 Floods
 Drought
 Earth quake
 Landslides
 Cyclone
 Tsunami
Manmade disaster
 Accidents
 Pollution
 Economic collapse
 Terrorist attack

4. Normal phase Emergency/
disaster phase
DISASTER CYCLE
Mitigation Rescue phase
Reconstruction Rehabilitation

5. FLOODS
• Whenever the magnitude of water flow exceeds the carrying capacity
of the channel within its banks , the excess of water over flows on the
surroundings causes floods.
TYPES:-
Coastal(surge flood).
Fluvial(river flood)
Pluvial(surface flood)

6. CAUSES:-
Heavy rainfall during cyclones.
Sudden melting of glacier.
Unchecked civil development of a region.
Sudden release of impound water.
Less carrying capacity of a channel/river

7. EFFECTS:-
It cause damage to the people’s property.
It affects the cultivation.
Health problems due to contamination.
It leads to a great economic loss.

8. PREVENTION MEASURES:-
• Encroachment of flood ways should be banned .
• Diverting the excess water to lakes,rivers,etc.
• Introducing check dams in small streams.
• River networking.
• Restore wetland.
• Satellite picture can be used for management.
• Flood forecast and flood warning by CWC.
• Afforestation .

9. Flood in 7-Sisters of India
• CAUSE – Over flowing of the river Brahmaputra.
• LOCATION- ASSAM,MANIPUR,ARUNACHAL
PRADESH,TIRIPURA,MIZORAM,MEGHALYA AND NAGALAND.
• DATE - 14/JULY/2017.
• EFFECTS- 85-DEADS.
4,00,000- were affected.
50,000-homeless.
60-animals.
Kaziranga national park.

10. DROUGHT:-
• It is defined as a prolonged period of abnormally low rainfall,leading
to a shortage of water.
CAUSES:-
Dry season
EL Nino
Erosion due to human activities
Climatic changes

11. TYPES:-
METEOROLOGICAL
AGRICULTURAL
HYDROLOGICAL
EFFECTS:-
CROPS YIELD
DUST POLLUTION
FAMINE
Increase of crime

12. EARTH QUAKE:-

13. Role of civil engineers in disaster
management.
• Structural analysis should be done using the latest techniques.
• Study of ground behaviour is must.
• Construct a proper earth quake resistant buildings.
• Construction of proper drainage system.
• Flooding resistant
• Study about disaster and management.