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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 CHANGE OF SEWERED POPULATION AND WATER QUALITY IN RIVER.

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THE CHALLENGES SEWERAGE SYSTEM IN TOKYO

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  1. 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”.

  2. THE CHANGE OF SEWERED POPULATION AND WATER QUALITY IN RIVER

  3. 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

  4. THE FACTORS TO DELAY THE EXPANSION OF SEWERED AREA ・Financial shortage (caused by recession, disaster, war etc) ・Difficulties administrative coordination

  5. 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

  6. 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.)

  7. 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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