The challenges sewerage system in tokyo
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THE CHALLENGES SEWERAGE SYSTEM IN TOKYO PowerPoint PPT Presentation


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THE CHALLENGES SEWERAGE SYSTEM IN TOKYO. ・ 1884 Started sewer construction ・ 1995 Accomplished almost 100% coverage in Tokyo 23 wards area In this duration, The implementation of project had been “trial and correct”. THE CHANGE OF SEWERED POPULATION AND WATER QUALITY IN RIVER.

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THE CHALLENGES SEWERAGE SYSTEM IN TOKYO

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The challenges sewerage system in tokyo

THE CHALLENGES SEWERAGE SYSTEM IN TOKYO

・1884 Started sewer construction

・1995 Accomplished almost 100%

coverage in Tokyo 23 wards area

In this duration, The implementation of project had been “trial and correct”.


The challenges sewerage system in tokyo

THE CHANGE OF SEWERED POPULATION

AND WATER QUALITY IN RIVER


The factors to promote the expansion of sewered area

THE FACTORS TO PROMOTE THE EXPANSION OF SEWERED AREA

・Crisis of epidemic

(caused by insufficient wastewater treatment)

・Deterioration of environment

(air/water pollution etc.)

・Rapid expanding of urban area


The factors to delay the expansion of sewered area

THE FACTORS TO DELAY THE EXPANSION OF SEWERED AREA

・Financial shortage

(caused by recession, disaster, war etc)

・Difficulties administrative coordination


The effort to harmonize promotion with obstacle factors

THE EFFORT TO HARMONIZE PROMOTION WITH OBSTACLE FACTORS

・Ensure stable finance system

(establish tariff and implementation

collection, introduction of subsidization

from central/local government)

・Review of priority/ commitment of governor

・Ensure legislation/ administrative system

・Project considered cost-reduction


The current theme

THE CURRENT THEME

・Reduction indebtedness

・Asset management

(Especially reconstruction of deteriorated sewer network area)

・The effort for new demand

(high level inundation control, combined sewer overflow control, advanced wastewater treatment etc.)


The changes indebtedness and cost

K×0.1bn. yen

The relation indebtedness and construction cost

K×0.1bn. yen

The total of indebtedness

Annual construction cost

THE CHANGES INDEBTEDNESS AND COST

2005

1991

2000

The relation total sewer length and management cost

K×0.1bn. yen

Annual management cost

Total sewer length

1996

2005

2000


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