Severe Weather Phenomena: Floods & Droughts
1
Floods: A Case Study of India
2
Case Study 1: Bangladesh, India
3
Causes of Flooding
1. Relief of the land
•Low lying country
•Flood plain and delta occupies 80% of the
land
•
4
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In these Lecture Slides, the Lecturer has discussed the following key concepts in Geography : Floods, Severe Weather, Floods, Droughts, Floods, Flooding, Low Lying Country, Flood Plain, Delta Occupies, Ganges
Typology: Slides
2012/2013
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Severe Weather Phenomena: Floods & Droughts
1
Floods: A Case Study of India
2
Case Study 1: Bangladesh, India
3
Causes of Flooding
- Relief of the land
• Low lying country
• Flood plain and delta occupies 80% of the
land
4
- Drainage of land
• 3 rivers enter the Bay of Bengal through
Bangladesh ! ! !
• Sediments build up on the river beds
__________________
Causes of Flooding
5
- Snow melt from __________________
• Water flows in the rivers Brahmaputra and
Ganges
• Increases the volume of water when it
reaches Bangladesh
Causes of Flooding
6
- Monsoon Rain
• ____________ Monsoon brings about
heavy rainfall
• Flooding becomes worse with rivers
overflowing with water from both monsoon rain and snow melt.
Causes of Flooding
7
- Storm Surges
• Tropical cyclones strike Bangladesh during
April – May, September – November.
• _________at Bay of Bengal forces water
to move forcefully inland & flood the land
Causes of Flooding
8
13
Causes of Flooding
- Climate Change
• Global warming exacerbates the impacts of
heavy rainfall received in flood prone regions.
13
Summary 14
14
(Other) Causes of Flooding
Not directly related to India’s Case Study
- Global Atmospheric Processes (El Nino)
15 15
(Other) Causes of Flooding
Not directly related to India’s Case Study
- Global Atmospheric Processes (La Nina)
16 16
(Other) Causes of Flooding
Not directly related to India’s Case Study
- Earth’s Movement
• Earthquakes
• Sediments deposited into rivers -->
flooding
17 17
• Social Impacts
• Economic Impacts
• Environment Impacts
Effects of Flooding
18
• Kills many people and leave them
homeless.
• Destroy crops, roads, railway lines and
bridges
Effects of Flooding
19
• Sweep away animals, farm equipments
and anything in the way
• Bring about water borne disease due to
contamination. Eg. cholera, typhoid
• Great financial losses.
Effects of Flooding
20
- Improve weather forecasting & preparedness
• Storm and flood forecasting
• Advanced warning system so that people
can evacuate flood-risk areas
Measures to handle Flooding
25
- Better evacuation procedures.
• More motor boats to evacuate people to
safer grounds
• Radios are linked to relief offices
• Volunteers equipped with loudspeakers
for better instructions
Measures to handle Flooding
26