Leakage Rate Decreased to 3.0% -Leakage Prevention Measures - Tokyo
■ Overview
Bureau of Waterworks, Tokyo Metropolitan Government has successfully lowered its water-leakage rate from over 30% sixty years ago to 3% in 2009 through advancing its leakage-prevention measures.
These measures have realized leakage prevention totaling an annual 330 million m3 (equivalent to the water usage of a 2.5 million man city).
Furthermore, this has also led to the annual reduction of 65,000 tons of CO2 greenhouse gas emissions.
These measures therefore contribute not only to the effective utilization of our precious water resources, but also to the effective curbing of global warming.
Trend in water leakage
■ Features
The following three policies are being strategically advanced:
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The systematic exchange of water pipes and enhancement of pipe material efficiency
(distribution pipes and service pipes)
・ Distribution pipes are being systematically changed to ductile cast-iron pipes, which are not only stronger and earthquake-resistant, but are also coated along the inside.
・ Service pipes, which are often the main cause of leakage, are being switched from brittle lead to strong stainless steel.
 Water Pipe with Earthquake-resistant Joint
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The early detection of leakage and prompt repair
・ The metropolitan area has been subdivided into approximately 6,800 blocks, allowing for meticulous leakage investigations and implementation of repair.
・ Highly-proficient personnel respond to issues around the clock utilizing the latest equipment
Leakage prevention work using the Electronic leak detector
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The development of leakage-prevention technology
・ Cutting-edge technological development is being proactively pursued, such as the development of an "inner-pipe investigatory robot."
■ Outcomes / Achievements
- ・ Compared with the leakage rate of FY1949, the Tokyo Metropolitan Government has been successful in reducing leakage by an annual 330 million m 3
- ・ CO2 emissions have been reduced by an annual 65,000 tons
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