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Ensuring quantity and quality of r aw water for water supply Methodology of Japan

Ensuring quantity and quality of r aw water for water supply Methodology of Japan. Japan Water Agency KUMAGAI Kazuya. Background of Japan. 3 layers administration Central government: Ministry of Health, Labor and welfare Prefecture(47): large area administration

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Ensuring quantity and quality of r aw water for water supply Methodology of Japan

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  1. Ensuring quantity and quality of raw water for water supplyMethodology of Japan Japan Water Agency KUMAGAI Kazuya

  2. Background of Japan • 3 layers administration • Central government: Ministry of Health, Labor and welfare • Prefecture(47): large area administration • Municipality (about 1800): water supply utility • Large number of Water supply utilities: about 10000

  3. Trend of service population and ration(Japan 1960-2005)

  4. Number of Utilities etc.(Large scale water supply/Bulk water supply/Dams) Dam 7339 4896 756

  5. Water Resource Quantity(million m3/year)

  6. To ensure quantity • Issue • Large number of bodies concerned • Multi purposes for water resource development (not only water supply but also agriculture, industry, electricity …..) • Key of success • Water resource development: Set only one special organization (owned by Central Gov.) • Water supply: gave prefectures “new role” as bulk water supply and it’s cost management

  7. Change for role of administration body Water supply management Specialized Organization (Central gov.) Water resource development Multi purpose management Cost assistance (Subsidy/loan) Municipality Water supply management Water resource Water treatment Distribution Charge/Cost management Prefecture Water treatment Cost management (for water resource development) Municipality Water treatment for one’s water resource Distribution Charge for people

  8. To ensure Quality • Fusion environment and water supply • Set the Common target : environment quality guidelines • Environment administration automatically work for water supply • Example : River • Lank AA : BOD 1mg/l simple or slow sand filtration • Lank A :BOD 2mg/l rapid sand filtration • Lank B :BOD 3mg/l advanced water treatment

  9. Improvement of water quality and environment protection Setting Environment guideline Effluent limitation in all Japan Strengthening effluent Limitation

  10. Issues for next stage in Japan • Making large scale water supply utility • Integrating bulk water supply and municipality’s water supply utility • Correspond to population decrease • Less energy water supply replacement KEYWORDS of Next Water Supply SystemSafety, Reliability, Stability, Environment and International

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