The 2011 Thailand floods were caused by a combination of natural and human factors. Naturally, the La Niña phenomenon brought heavy rains to western Thailand. However, human activities like deforestation and urban development exacerbated the flooding. The floods caused billions in damages, disrupted the global supply chain, and spread diseases. Thailand implemented solutions like building dykes, dams, and an underground canal to manage flood waters, but constructing a new underground canal was deemed the most effective long-term strategy.
Wetlands in Bangladesh encompass a wide verity of dynamic ecosystems ranging from mangrove forest (about 577, 100 ha), natural lakes, man-made reservoir (Kaptai lake), freshwater marshes (about 400 haors), oxbow lakes (about 54488 ha, locally known as baors), freshwater depressions (about 1,000 beels), fish ponds and tanks (about 147, 000 ha), estuaries and seasonal inundated extensive floodplains (Akonda, 1989; cited in Akbar Ali Khan 1993 and DoF 1985).
Now a days climate is rapidly changing. Its' effect on Bangladesh is described in this document. Mainly focused on the sea level rise of Bangladesh. Hope many will get idea about this.
Thanks to all.
Presentation at Twentieth Fobana 2006
20. ATLANA
Host: Bangladesh Association of Georgia
Date: Labor Day Weekend, September 1-3, 2006
Venue: Cobb Galleria Centre, Atlanta, GA
Convener: Jashim Uddin
Member Secretary: Mohammed Arefin Babulhttp://www.fobanaonline.com/index.php?option=com_content&view=article&id=126&Itemid=61
Wetlands in Bangladesh encompass a wide verity of dynamic ecosystems ranging from mangrove forest (about 577, 100 ha), natural lakes, man-made reservoir (Kaptai lake), freshwater marshes (about 400 haors), oxbow lakes (about 54488 ha, locally known as baors), freshwater depressions (about 1,000 beels), fish ponds and tanks (about 147, 000 ha), estuaries and seasonal inundated extensive floodplains (Akonda, 1989; cited in Akbar Ali Khan 1993 and DoF 1985).
Now a days climate is rapidly changing. Its' effect on Bangladesh is described in this document. Mainly focused on the sea level rise of Bangladesh. Hope many will get idea about this.
Thanks to all.
Presentation at Twentieth Fobana 2006
20. ATLANA
Host: Bangladesh Association of Georgia
Date: Labor Day Weekend, September 1-3, 2006
Venue: Cobb Galleria Centre, Atlanta, GA
Convener: Jashim Uddin
Member Secretary: Mohammed Arefin Babulhttp://www.fobanaonline.com/index.php?option=com_content&view=article&id=126&Itemid=61
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mostly poor people are dying because of water and food but mostly food cause rich or middle class people are wasting water how as they drink water some water is still left in the glass but they throw it it in the bin with dirt that mixes with water and be a bacteria.
he management of water resources has become a critical need in Bangladesh because of growing demand for water and increasing conflict over its alternative uses. As populations expand and make various uses of water, its growing scarcity becomes a serious issue in developing countries such as Bangladesh.
By Md. Rezaul Hasan, Md. Shamsuddin, Md. Sohel Masud, Dr. AFM Afzal Hossain (Institute of Water Modelling)
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mostly poor people are dying because of water and food but mostly food cause rich or middle class people are wasting water how as they drink water some water is still left in the glass but they throw it it in the bin with dirt that mixes with water and be a bacteria.
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http://waterandfood.org/ganges-conference/
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Session Overview
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2. Background Information
• Thailand normally experiences its rainy season during the period of June to
October.
• As Thailand is geographically sloped, all the rainwater collected from the
North will flow southward and into the Gulf of Thailand.
• However, due to the increase in human activities, it resulted in 100 000 000
000 cubic metres of water to be accumulated behind the dams.
• Currently, there are only 3 routes left for the water to flow into the Gulf of
Thailand, namely, the Jeen River, the Bang Pakong River and the Chao
Praya River.
• These rivers can only bring 2 000 000 000 cubic metres of water into the
Gulf of Thailand which means that it will take 50 days for the water to be
completely drained away.
• The 2011 Thailand flood is by far the worst flood that had struck Thailand.
4. Causes of the flood
Natural Causes
• La Niña phenomenon
Human Causes
• Deforestation
• Urban Development
5. La Niña phenomenon
• La Niña refers to the abnormal warming of the water surface at the
southwestern part of the Pacific Ocean.
• It usually follows after an El Niño process.
6. La Niña phenomenon
• During La Niña, cold waters rising from the east chill the air above it,
bringing drought to countries at the eastern Pacific since the wind will blow
from the east (a region of high pressure) to the west (a region of low
pressure).
• On the other hand, as the trade wind blows toward the west, it will bring
heavy rains to the western Pacific, increasing the likelihood of flooding in
that area.
• Coincidentally, Thailand is located in the western Pacific. Henceforth,
flooding will eventually occur due to the La Niña process.
7. Urban development
• As Thailand is a developing country, the government has to build various
infrastructures in the major cities and urban areas.
• In these urban areas, concrete pavements and tarred roads prevent
rainwater from seeping into the ground.
• Besides that, with the rise of high density buildings, it prevents water from
draining away more efficiently.
• This is reflected in the case of Big C Department Store located in Hat Yai,
which prevented water from being drained via the Utapoa canal.
8. Deforestation
• Ten years ago, Thailand was a home to many natural vegetation and
forests.
• However, due to illegal logging and the government’s agricultural policy, it
had resulted in the loss of many forests.
9. Deforestation
• Without these forests, there will be no vegetation to intercept the rainwater.
• Besides that, since Thailand is geographically sloped at an angle, without
trees to secure the soil together, it will increase the chances of soil erosion.
• As such, soil and mud will be washed into rivers, causing them to be
shallower.
• Furthermore, the bare slopes that remained will result in increased surface
runoff.
• All these will then result in flooding in Thailand.
10. Effects of the flood
1. Damage to industrial estates and global supply shortages
2. Sanitation concerns
3. Loss of lives and economic damages
11. Damage to industrial estates and global
supply shortages
• On 8 October 2011, the flood had caused the collapse of a 10 metre high
water blockage in Nikom Rojna industrial estate which housed many
manufacturing plants.
• The strong currents interfered with reconstruction efforts and resulted in the
whole area being non-operational.
• Thailand is also responsible for approximately 25% of the world’s production
of hard disk drives.
• However, numerous factories, including Western Digital’s, that are in charge
of the production of hard disk drives were flooded, leading to some industry
analysts to predict future worldwide shortages of hard disk drives.
• Nonetheless, the problem was alleviated when Western Digital managed to
re-operate one of their plants.
12. Sanitation concerns
• As the flood water subsides, it will leave behind stagnant pools of water
which may cause the effects of trash and sewage within them to peak.
• In addition, since a household sanitation system is unable to operate under
flood water, individuals that remained in flooded areas exposed themselves
to risks and also increased the risks for those living downstream by
continuing to produce more sewage and trash in the waters.
• As a result of these stagnant water and water pollution, it will encourage the
growth of bacteria and mosquitoes which will result in the spread of dengue
fever, malaria, cholera and other diseases which are detrimental to our
health.
13. Loss of lives and economic damages
• As of 6 November 2011, the flooding has affected 3,151,224 people from
1,154,576 families, with 506 deaths and 2 missing persons.
• The total damages summed up to approximately 185 billion baht.
• 930 factories in 28 provinces were flooded, causing many industrial
processes to halt.
• It is estimated that the flood will result in a decrease of 0.6 to 0.9% in
Thailand’s economic growth.
14. Solutions
1. Building of dykes
2. Building of dams
3. Building of new underground canal
4. Watershed management
15. Building of dykes
• Dykes were already being built in Bangkok to prevent floods.
• Dykes are made up of sand, stone and concrete and are built along river
banks which are prone to flooding.
• These dykes increase the capacity of the river to hold water and hence
reducing the chances of flooding.
• Through the building of more dykes, the Thailand government hopes to
reduce the effects of flood significantly.
Dykes
16. Building of dams
• Building of dams is another way in which the Thailand government
implemented to reduce floods.
• The main purpose of a dam is to control the amount of water that flows
downstream in a river.
• Gates are being installed in the walls of the dams to hold back or release
water from the man-made reservoir behind it.
• The reservoir also serves a purpose in preventing flood simply by increasing
the amount of water that a river system can hold upstream.
• Currently, dams had already been constructed on the Ping river (the
Bhumibol Dam) and on the Nan River ( the Sirikit Dam).
17. The man-made reservoir
The Dam
A bird’s eye view of the Bhumibol Dam.
Other than preventing floods, it is also used for
hydroelectric production.
18. Building of new underground canal
• The Engineering Institute of Thailand came up with a proposal to build a
underground tunnel that stretches 100km with a diameter of 24 meter and a
depth of 10km in order to reduce the impact of floods.
• The construction will take at least 2 years and it will cost about 200 billion
baht.
• This underground tunnel will be connected to existing canals and will act as
an expressway to allow water to flow directly and quickly into the sea
without any impact to the communities.
• With this new tunnel, it will boost the drainage capacity of the city to 130
million cubic metres a day.
19. Watershed management
• New ways to deal with floods include managing the entire water shed.
• The Royal Forest Department(RFD) in Thailand is an example where it has
developed a watershed management programme to prevent floods from
occurring.
• This programme comprises detailed plans on conserving the natural
vegetation in watersheds.
• By conserving vegetation cover, surface runoff and the amount of sediments
washed into rivers are reduced.
• This in turn reduces the occurrence of floods.
• The RFD programme also includes re-planting trees in areas where they
were previously cut down.
• The planting of trees and grass on slopes reduces surface runoff and soil
erosion, thereby decreasing the chances of flooding.
20. Evaluation of the 4 solutions
Solutions Advantages Disadvantages
• Able to increase the • May erode over time due
holding capacity of the to the currents of the
Building of dykes river, thus, reducing river, hence, checks had
floods. to be conducted on a
timely basis to ensure
that it’s still in working
conditions.
• Compared to dykes, it is • Dams are costly to
able to increase the build.
Building of dams holding capacity of the • Dams may be
river more.
damaged as a result
• Dams are able to
produce hydroelectricity of too much water
at the same time, pressure.
21. Evaluation of the 4 solutions
Solutions Advantages Disadvantages
• Allow water to flow • Like the construction
directly and quickly to of dams, it involves a
the sea without any great amount of
Building of new impact to the money.
underground canal communities. • It is time consuming to
• Boost the drainage construct.
capacity of the current
canals.
• It helps to solve the • Illegal logging may
problems of still take place when
Watershed management deforestation in the trees are grown.
Thailand at the same
time.
22. Our opinion
• Out of the 4 solutions, we feel that building of the new underground canal is
the most effective solution.
Why?
• The building of dykes can only prevent floods for a short period of time.
• As time goes by, the dykes will be eroded by the water which may cause it
to collapse and thus, the government will have to carry out checks on a
timely basis to ensure that it is still in working conditions.
• This will require a huge planning process and would not be cost effective as
it needs to make use of large amount of manpower to carry out the checks.
23. Our opinion
• Out of the 4 solutions, we feel that building of the new underground canal is
the most effective solution.
Why?
• Managing a watershed environment for the prevention of floods is a perfect
example of "Prevention rather than Cure".
• It emphasizes on how we can make preparations before the flood comes
instead of trying to salvage the remains and aftermath later.
• However, we feel that even if this project is successful, it would be
extremely costly to continue funding this project and to sustain it.
• The vegetation might not be suitable to grow in that area and often, external
factors such as heavy thunderstorms and droughts might cause the plans to
wither away or to collapse and fall.
• Plants are also weak, vulnerable and susceptible by nature. Thus, they can
only rely on circumstantial factors to survive.
• In conclusion, this is not a good suggestion.
24. Our opinion
• Out of the 4 solutions, we feel that building of the new underground canal is
the most effective solution.
Why?
• As for the construction of dams, without an efficient draining system, floods
will still occur.
• Dams only allow about 2 billion cubic metres of water to flow into the Gulf of
Thailand via the three rivers.
• During the rainy season in Thailand, there will be about 100billion cubic
metres of water to be accumulated.
• This will definitely mean that it will take 50 days for the water to be
completely drained away.
• Therefore, it is not time-efficient enough to be considered the best strategy.
25. Our opinion
• Out of the 4 solutions, we feel that building of the new underground canal is
the most effective solution.
Why?
• With the construction of more underground canals, it will allow more water
to flow directly and quickly to the Gulf of Thailand.
• Hence, the time taken for the water to be drained away will decrease
significantly, causing the chances of flood occurrence to drop.
• Therefore, we feel that building of the new underground canal is the most
effective solution.
26. Thank you for your kind attention and
good bye!
Our wiki: http://geography-project-floods.blogspot.com/