Bureau of Waterworks Tokyo Metropolitan Government

2009

1Tokyo Metropolitan Waterworks Bureau

Copyright 2009 Bureau of Waterworks,Tokyo Metropolitan Government.

All Rights Reserved.

１. Overview of water services in Tokyo ２. Efficient usage of water by leakage

prevention３. Achievement of the C40 Tokyo

Conference on Climate Changes - Current efforts on the joint actions -

2Tokyo Metropolitan Waterworks Bureau

Tokyo Metropolitan Waterworks Bureau

Population served (in thousands ) 12,494

Total length of water main and distribution pipes (ｋｍ) 25,652

Ave. distribution amount per day (in thousands ㎥) 4,390

（Actual in 2007）

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TokyoJAPAN

Tokyo

4Tokyo Metropolitan Waterworks Bureau

Water resources

Water leakage preventionWater leakage prevention

Measures to climate changesMeasures to climate changes

Energy CO2Finance

Tokyo Metropolitan Waterworks Bureau 5

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(%)

Leakage rate （％）• Effective use of water, approx. 340 mil.

m3/year (equivalent to the amount of water distributed to a city of 2.5 mil. People)

• Energy saving, approx. 170 thousand kW hour/ year (equivalent to energy used by approx. 50,000 households)

• Reduction of CO２ emissions, approx. 68,000 ton/year

• Effective use of water, approx. 340 mil. m3/year (equivalent to the amount of water distributed to a city of 2.5 mil. People)

• Energy saving, approx. 170 thousand kW hour/ year (equivalent to energy used by approx. 50,000 households)

• Reduction of CO２ emissions, approx. 68,000 ton/year

Effects of leakage preventionEffects of leakage prevention

In 1955Leakage rate

20%In 2007

Leakage rate 3.3%

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Ensuring high level technologies

Leakage detection technology / repairs of leakage in early

stages

Replacing water pipes /

improving pipe materials

Measures of water leakage prevention in TokyoMeasures of water leakage prevention in Tokyo

Leakage rate3.3%(2007)

Improvement of water pipe materials (implementation of ductile cast-iron pipes）

Midnight leakage detection Training of plumbing

technology

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Planned replacement of water pipesPlanned replacement of water pipes(replacement of aging distribution pipes with ductile cast(replacement of aging distribution pipes with ductile cast--iron iron pipes)pipes)Aging distribution pipes Ductile cast-iron pipes

Replacement Approx. 180

km/year

Transition of the ratio of ductile cast-iron pipes and leakages（distribution pipes)

0

100

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500

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0%

10%

20%

30%

40%

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90%

100%

Ratio of ductile cast-iron pipes

Rat

io o

f ductile

cas

t-iron p

ipes

(%) Number of

leakages in the distribution pipes

Num

ber o

f leakage

s in

the d

istributio

n p

ipes

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Lead service pipes

Improvement of pipe materialsImprovement of pipe materials(replacement of service pipes to stainless steel pipes(replacement of service pipes to stainless steel pipes））

Stainless steel pipes

公 道 部 私 有 地Public roadPublic road Private propertyPrivate property

Service pipesDistribution pipes

Water meter

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Research, identify, and repair subsurface leakage

Subsurface leakage prevention

Prompt repairs of leakageoperates 24 hours

Leakage prevention on the ground

Aging pipes φ500mm

Water leakage detection technique and prompt repairs of Water leakage detection technique and prompt repairs of leakageleakage

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correlative leak detector

Helium gas leak detectorPipe inspect robot

Ensuring a high standard of technologyEnsuring a high standard of technology

Leakage detection technologyLeakage detection technologyDevelopment of correlative leak detector and helium gas leak detector etc.

Leakage prevention technologyLeakage prevention technologyDevelopment of a robot to inspect the pipes

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““Promotion of water leakage prevention and Promotion of water leakage prevention and provision of technical informationprovision of technical information””

Joint ActionsJoint ActionsJoint Actions

1 education of water leakage reduction1 education of water leakage reduction2 sharing of leakage prevention technology2 sharing of leakage prevention technology

Save  the  water , Save  the  earthSave  the  water , Save  the  earth

Achievement of C40 Tokyo Conference on Climate ChangeAchievement of C40 Tokyo Conference on Climate Change

Participating CitiesParticipating Cities・・Addis AbabaAddis Ababa・・ChicagoChicago・・Hong KongHong Kong・・JohannesburgJohannesburg・・Los AngelesLos Angeles・・Mexico CityMexico City・・New YorkNew York・・Sao PauloSao Paulo・・SeoulSeoul・・TokyoTokyo・・TorontoToronto・・WarsawWarsaw

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Joint action posterJoint action poster

World Water Forum, Tokyo boothWorld Water Forum, Tokyo booth

Current efforts of the joint actionsCurrent efforts of the joint actions

created and distributed posters created and distributed posters to the participating citiesto the participating cities

Participated in the 5th World Water Forum

（Istanbul, Turkey, March 16-22, 2009)

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Let’s join us！

Thank you for your attention.Thank you for your attention.

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