Ensuring quantity and quality of r aw water for water supply Methodology of Japan
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Ensuring quantity and quali Ensuring quantity and quali ty ty of of r r aw water for water sup aw water for water sup ply ply Methodology of Japan Methodology of Japan Japan Water Agency KUMAGAI Kazuya
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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 - PowerPoint PPT Presentation
Transcript of Ensuring quantity and quality of r aw water for water supply Methodology of Japan
Ensuring quantity and qualityEnsuring quantity and quality of of rraw water for water supplyaw water for water supply
Methodology of JapanMethodology of Japan
Japan Water Agency
KUMAGAI Kazuya
Background of JapanBackground of Japan
3 layers administration– Central government: Ministry of Health,
Labor and welfare– Prefecture(47): large area administration– Municipality (about 1800): water supply
utilityLarge number of Water supply utilities:
about 10000
Trend of service population and rationTrend of service population and ration(Japan 1960-2005)(Japan 1960-2005)
53.4
80.8
91.5 94.7 96.6 97.2
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
1960 1970 1980 1990 2000 2005
Pop
ulat
ion(
millio
n pe
rson
)
0
10
20
30
40
5060
70
80
90
100
(%)
population service pop diffusion(%)
Number of Utilities etc.Number of Utilities etc.(Large scale water supply/Bulk water supply/Dams)(Large scale water supply/Bulk water supply/Dams)
1051
1662
1964 1958
1602
1828
35
85
105111
102
5
0
500
1000
1500
2000
2500
1960 1970 1980 1990 2000 20050
20
40
60
80
100
120
large scale utility Bulk
756
4896
7339
Dam
Water Resource QuantityWater Resource Quantity(million m3/year)(million m3/year)
1965 1985 2005
River 3581(54%) 5265 4329(27%)
Dam 756(11%) 4895 7339(44%)
Lake 56(1%) 190 224(1%)River-bed
947(14%) 738 611(4%)
Well 935(14%) 3307 3343(21%)
Others 378(6%) 488 478(3%)
Total 6653 14884 16324
To ensure quantity 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
Water supply management
Change for role Change for role of administration bodyof administration body
Municipality
Water supply managementWater resourceWater treatment
DistributionCharge/Cost management
MunicipalityWater treatment for one’s water resource
DistributionCharge for people
PrefectureWater treatment
Cost management (for water resource development)
Specialized Organization (Central gov.)Water resource developmentMulti purpose management
Cost assistance (Subsidy/loan)
To ensure QualityTo ensure Quality
Fusion environment and water supply– Set the Common target : environment
quality guidelines
– Environment administration automatically work for water supply
Example : RiverLank AA : BOD 1mg/l simple or slow sand filtrationLank A :BOD 2mg/l rapid sand filtrationLank B :BOD 3mg/l advanced water treatment
Improvement of water quality Improvement of water quality and environment protectionand environment protection
51
6774
8287
15
30
44
71
81
0
10
20
30
40
50
60
70
80
90
100
1970 1974 1980 1990 2000 20050
10
20
30
40
50
60
70
80
90
100
environment guideline value achievement ratio(%)
sewage diffusion(%)
Setting E
nvironment guideline
Effluent lim
itation in all Japan
Strengthening effluent Limitation
Issues for next stage in Japan 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 System Safety, Reliability, Stability, Environment
and International
