Rapid urbanization and changing land values in mega cities ...
Water Resources Management for Mega-Cities - OECD.org · Water Resources Management for Mega-Cities...
Transcript of Water Resources Management for Mega-Cities - OECD.org · Water Resources Management for Mega-Cities...
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Water Resources Managementfor
Mega-Cities
OHGAKI, Shinichiro
Department of Urban Engineering, The University of TokyoJapan
Vice Chair, OECD/CSTP
Workshop on International Scientific and Technological Co-operation for Sustainable DevelopmentIn South Africa, OECD-SA, November 21-23, 2005
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The 13th Session of The United Nations Commission on Sustainable Development
(CSD-13)11-22 April, 2005,
at UN Headquarters in New York
The thematic issues were:to provide measures to facilitate and enhance implementation in themes of
water, sanitation and human settlements.
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(by courtesy of Prof.Gupta,Asian Institute of
Technology, Bangkok)
World Environment Day: June 5th 2005
UN Secretary- General Kofi Annan said, by 2030,more than 60% of the world’s population will live in cities. The growth poses huge problems, ranging fromclean water supplies to trash collection.
(Bangkok Post, June 6th, 2005)
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World mega-cities (over 5 million population)1950: only 8 cities in the
world
2015: 31 cities in Asia out of 58 cities
2020: 1 billion in Asia
©National Geographic, Nov. 2002
(By courtesy of Dr. Takizawa, The Univ. of Tokyo)
1950
2000
2015
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Detail Distributionof Urban Population (over 100,000)
(drawn by Dr. Ohta, Center for Sustainable Urban Regeneration,The Univ. of Tokyo)
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(Dr. Ohta, Center for Sustainable Urban Regeneration, The Univ. of Tokyo)
Distribution of Urban Population from Africa to Asia
10 million
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Urban and peri-urban areas are faced with many kind of threatsto water resources and water environment.
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8(Source: Global Environment Outlook 3, UNEP, 2002)
Water problems with poverty in urban area
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● case study cities
Sri Lanka● ●
●
●
●
●
Ho Chi Minh
Bandung
Tianjin
Bangkok
Tokyo
by Freshwater ResourcesManagement Project,
Institute for Global Environment Sustainability, Japan
■ Singapore
■Singapore
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Anaerobic polluted river (in Colombo, Sri Lanka)
Heavily eutrophic river
(photo by Ohgaki, S., 2005 April)
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11(by Mr.A.D. Sutadian)
Bandung, Indonesia
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Groundwater Problems (1) Quantity
Source: UNESCAP, 2002
Total Land Subsidence (1992-2000)
Groundwater Depletion- Water level drawdown- More difficulty in extracting
water
Land Subsidence- Damage to infrastructure- Flooding- Disturb/deteriorate drainage
systems
Bangkok, Thailand
(by courtesy of Dr.Babel, AIT)
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Layer 2:Phra Pradaeng Aquifer
Source: JICA 1995 Data collected in 1993
Groundwater Problems (2) QualityWater Quality Deterioration- saltwater intrusion
Saltwater of 2000 ppm intruded more than 80 km from the sea
(by courtesy of Dr.Babel, AIT)
Bangkok, Thailand
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15%
50%
23%
12%
Industrial Water UseAgricultural W ater UseDomestic W ater UseEcological W ater Use
Beneficial Use of GW (2002)
South part = salt water areas
50% of GW use is for agriculture
All GW use for agricultural is not counted = large different from
the actual use volume?
Groundwater Use and shortage of waterTianjin, China
(by courtesy of Dr. Xu He, Nankai Univ.)
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15(Photo by Ohgaki, 2005 April)
TSUNAMI destroyed groundwater quality, also.
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Fresh Groundwater
Dug Well
Water Table
Pond, Paddy Field etc.
Saline Groundwater
Saline water Interface
Dry Soil Cover
TSUNAMI WAVES
Drawing by Dr. Gemunu HERATH and Shinichiro OHGAKI, (2005)Freshwater Resources Management Project,Institute for Global Environmental Strategies, Hayama, Japan
Original concept by Dr. Atula SENARATNE,Senior Lecturer in Geology, University of Peradeniya, and alsothe current Chairman of Water Resources Board, Sri Lanka
Saline Water Intrusion
AfterBefore
Sea Level
TSUNAMI
X
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Water in
Tokyo and Surrounding Urban Areaas a super mega city
(population : around 26 million)
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Water environment in Tokyo
Downtown, Sumidagawa River & Tokyo Bay
Water Resources: Ogouchi ReservoirSurburb
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100 km
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Yagisawa Dam
Fujiwara DamAimata Dam
Yatsuba Dam
Takizawa Dam
Naramata Dam
Tokura Dam
Kuriharakawa Dam
Sonohara DamKusaki Dam
Ogouchi Dam
Sagami Dam
Shiroyama Dam
Urayama Dam
Shimokubo Dam Edogawa riv.
Arakawa riv.
Tamagawa riv.
Tonegawa riv.
Nakagawa riv.
Sagamigawa riv.
Yamaguchi Res. Murayama Res.
Watarase Res.
Watarasegawa riv.
Arakawa Res.
Kasumigaura
Water ChannelsWater Treatment Plants
Water Network in Tokyo
Modified from the source: Bureau of Waterworks, TMG © S.Ishii, COE Project, Tokyo University
under construction
DamsIn operation
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0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Population with water supply/sewerage in TokyoPo
pula
tion
(mill
ion)
Fiscal year
Total PopulationPopulation with water supplyPopulation with sewerage
© S.Ishii, COE Project, Tokyo UniversityCreated from the sources: Bureau of Waterworks, TMG; Keihin Office of River, MILT Japan; Bureau of General Affairs, TMG
Wor
ld W
ar II
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22Copyright:Hajime Ishikawa@Tokyo Canal Project
Artery of water in Tokyo downtown
10 km
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23Copyright:Hajime Ishikawa@Tokyo Canal Project
10 km
Vein of water in Tokyo downtown
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Combined Sewer Overflows Problem in Tokyo
Source: Bureau of Sewerage, Yokohama city & TMG
Source: Bureau of Sewerage, TMG
When the rain comes…
Combined type Separated type
797 CSO-outlets0 km 5 km 10 km
(by courtesy of Prof. Furumai, The Univ. of Tokyo)
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Source: Web site of Ministry of Land and Transport, Japan
Tama River flows through Densely Inhabited Area(22km from the river mouth)
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26Sumidagawa riv.
Ochanomizu station
Nihonbashi
Kandagawa riv.
Picture source: Tokyo Canal Project
Picture source: Tokyo Canal Project
Picture source: Tokyo Canal Project
Rivers in Downtown of Tokyo
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Chofu intake gate
Yanagibashi bridge
Tamakawara bridge
Shingashi riv.
Shishigebashi bridge.
Tamagawa riv.
Kodairabashi bridge
Ryogoku bridge
Nakagawa riv.
Kasaikobashi bridge
Taishibashi bridge
71.0%
18.1%
32.3%
50.2%50.6%
95.9%
17.0%
35.3%
Modified from the source: Bureau of Sewerage, TMG
Sumidagawa riv.
Treated Effluents (%)
Large share of effluent from STPs in rivers
0 km 5 km 10 km 20 km
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Current issues associated with the water environment in urban area in Japan
-How to allocate a future water resource in watersheds
(rational beneficial use/reuse of water)-How to accommodate the multiple functions of
“water” in urban area(need of co-existence between human and ecosystems)
-How to maintain and upgrade the existing infrastructures
(e.g. aging sewerage systems, combined sewer overflow problem)
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For sustainable water resources and water environment of mega-cities
We are far from the ideal sustainable cities in both economically developing and developed regions.And the water is one of the most complicated social issues, but we have and are obtaining
our knowledge and toolson innovative science and technology,on new policy measures,on new implication methods, andon new system management.
For example,…..
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Some Technological Policies and Practicesfor
Water resources in mega-citiesin
Asia
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Rainwater for
toilet flushing and cooling waterIn
Tokyo
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National Sport Stadium
Tank capacity: 1,000 m3
For toilet flushing / cooling water
Daily use: 20.9 m3 (70% of total)
Tokyo Dome Stadium
Tank capacity: 1,000 m3
For toilet flushing
Daily use: 186.3 m3
Rainwater use
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Reclaimed wastewater from a sewage treatment plant
fortoilet flushing reuse
in a skyscrapers area in Tokyo
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Shinjuku Skyscrapers and Tokyo City Hall
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Shinjuku Area
Ochiai Sewage Treatment Plant
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36Source: Bureau of Urban Development, TMG
Sinjuku wastewater reuse centre
Daily supply: 2,740 m3 (30% of total)
For toilet flushing only
Tank Capacity: 8,000 m3
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37Source: Bureau of Urban Development, TMG
Category
Individual building
Group of buildings
Large area scale
Reclaimed wastewater reuse systems in operation in Tokyo (at March, 2002)
Number of system
293
170
97
43,809
20,167
17,062
Volume(m3 day-1)
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Reclaimed wastewater reuse for
Landscape regenerationin Tokyo
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Landscape regeneration using reclaimed wastewater
Nobidome yousui
Picture source: Bureau of Sewerage, TMG
Senkawa jyosui Tamagawa jyosui
Picture source: Mitaka Education Centre
Dry up
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Seawater Reclamation Experimental Facility
with UV radiation
at Tokyo Bay Seashore
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Tokyo Bay
Picture source: Bureau of the Environment, Tokyo Metropolitan Government:
ODAIBA
Tokyo Downtown
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Seashore and the Outlet of Reclaimed Seawaterin a Pilot Study (Started from July 2003)
(東京都環境局HP)Odaiba Seashore Park
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System on Reclamation of Seawater
Bio-membrane filtration
UV disinfection
Medium-pressure UV lamps
(1.9kW×12)
(Photo by MasagoJune 2003)
Discharge
Ariake WWTP
effluent
(5000m3/d)
Odaiba seashore
Ariake Canal
pumped up
(Oguma and Ohgaki,2003)
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Cascade system for
hand-washing water followed by
toilet-flushing
inan individual house in Tokyo
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Singapore (population = 4.2 million)
PUB, Singapore, has ensured a diversified and sustainable supply of water for Singapore with;
the Four National Taps
1. Local catchment water
2. Imported water (from Malaysia)
3. NEWater (reclaimed wastewater)
4. Desalinated water (from seawater)
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Marina Barrage (河口堰)
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Wastewater reuse in Tianjin, China
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Mobile Plant of Membrane Water Treatment Systemin Thailand
(By courtesy ofDr. Chavalit Ratanamskul,Chulalonkorn Univ., Bangkok)
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Patchwork on Environment in Asia-Pacific Region- Population density- Climate (Rainfall, Temperature, ………)- Sanitary condition- Measures against disasters (Tsunami, Earthquake, Flooding,….)
Pacific Ocean
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Mega-cities in economically developing regions in Asia-Pacific are experiencing mainly five major surges simultaneously:
-Increasing urban population,-Rapid economic growth and centralization,-Unprecedented technological development,-Social and cultural fragmentation, and -Surge of economic globalization
(Other regions like African cities would be in the same situation.)
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For future international co-operation on water issues;
Because of the patchwork-environment and the five surges in the current developing cities,
-We cannot discuss the water issues on the base of country-size but we should consider it as the specific areas.
-We should be careful that we do not misunderstand the real social issues in the specific area from the discussion on the country based data.
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For possible indicators of good practices in international science and technology co-operation (especially for water):
- Does the co-operation have a clear target area?
- Is the output from the co-operation based on the facts and evidence?
- Does the output from the co-operation clarify the priority of policy options?
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AcknowledgementsColleagues and friends
of-Center for Sustainable Urban Regeneration, The Univ. of Tokyo-Dept. of Urban Eng., The Univ. of Tokyo-Asian Institute of Technology, Bangkok-Churalongkon Univ., Thailand -Institute for Global Environment Strategies, Hayama, Japan
Ms. Kataoka, Y. , Dr. Hara, K., Dr. Gemunu HERATH-PUB, Singapore
-Tianjin, ChinaDr. Xu He and his team, Institute of Environmental Science and Engineering, Nankai University
-Bandung, IndonesiaDr. Setiawan Wangsaatmaja and his team West Java Environmental Protection Agency
-Bangkok, ThailandDr. Mukand Singh Babel and Ms. Niña Donna Sto. DomingoAsian Institute of Technologies
-Ho Chi Minh City, VietnamDr. Nguyen Phuoc Dan and his teamHo Chi Min City University of Technology
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Thank you