21 September 2011
At the 3rd WEPA workshop on water quality management

Katsunori Takagi
NARBO (Network of Asian River Basin Organization)
Water Resources Engineering Department

Japan Water Agency

11.Water Resources Development Promotion Law
Water Resources Development Basic Plan (“Full Plan”) for each river system

2.Japan Water Agency Law
JWA’s activities
New construction and reconstruction of Water
Resources Development Facilities and operationof those completed structures
Ministers
ste sWater utilization•Domestic Water•Industrial Water•Irrigation Water

supervising
Flood control

JWA’sactivities

21

Tone & Ara River system- Total basin area:19,780km2- Completed project: 21- Under construction:3- Population supplied: 15 million people- Irrigated area:94,000ha- Contribution for industrial shipment:3.2 trillion yen/yr
Toyo & Kiso River system- Total basin area:9,824km2- Completed project: 14- Under construction:2- Population supplied: 8.5
8 5 million people- Irrigated area:52,000ha- Contribution for industrial shipment:5.2 trillion yen/yr

On-going projects:11
Completed project:58
Location of JWA Project

Yagisawa Dam

Nagaragawa Estuary Barrage

Yodo River system- Total basin area:8,240km2- Completed project: 11- Under construction:2- Population supplied: 12 million people- Irrigated area:1,000ha- Contribution for industrial shipment:2.1 trillion yen/yr

Lake Biwa Development

Yoshino River system- Total basin area:3,750km2- Completed project: 8- Population supplied: 1.5 million people- Irrigated area:40,000ha- Contribution for industrial shipment:2.0 trillion yen/yr

Sameura Dam

Chikugo River system- Total basin area:2,860km2- Completed project: 4- Under Construction:4- Population supplied: 1.3 million people- Irrigated area:40,000ha- Contribution for industrial shipment:0.02 trillion yen/yr

Terauchi Dam432

JWA have constructed and operated dams and canals for
supplying domestic (drinking), agricultural, industrial waterg flood control.
and also doing
Area 16.7

83.3%%
Total population
Sum of industrial shipments
KISO River system
YODO River
Risystemt

TONE and ARA
River system
TOYO River system
YOSHINO
River system“Full pplan” areas

The Pacific Belt
Belt, whereconcentrated population andindustrial area in Japan.

49.1%

50.9%46.6%

53.4%

Other areas

The total area of the districts under theWater Resources Development Basic Plan
(districts receiving water supply from theseven river systems) account for only 17% of
the national land area, but about 50% of the
population and industrial output areconcentrated there.

CHIKUGO Riversystem

5Planning, examination, designing, estimate, construction work
control, maintenance, operation, management of water resources andflood control facilities etc…

 Civil Engineer ; 800
 Mechanical Engineer ; 100
 Electrical Engineer ; 150
 Treasurer, Lawyer andStaffs in charge of site acquisition ; 400
 Around 70

staff from the national governments is working in JWA.
 Around 100 JWA staff are working in both National and Local
Governments.

1,450 staffs are working for JWA.

63

●味噌川ダム

●牧尾ダム
●岩屋ダム

The length of the river : 227 km●徳山ダム

Kiso River

長良川河口堰

Agigawa
gg
Dam

兼山取水口
愛知用水

長良川

揖斐川

濃尾平野

中央アルプス●Water quality conservation efforts atAgigawa Dam

知多半島

110 km away from the river mouth of the Kiso River

伊勢湾
渥美半島

7Population in catchment area :7,800
Number of cattle：800 cows and 2,300 pigs
Area of cultivated land：900haThe Kiso River

大井ダム

E CityEnaCitDrain by human activities
Agigawa Dam
Rock-fill dam
Storage capacity：48 million m3
Height ：101.5m
Area of reservoir：1.58km2

中津川

Nutrient salts like nitrogen, phosphorous
flows into the reservoir

Catchment area ：81.8km2

The reservoir became eutrophic lake
Phytoplankton increase more

84

Various types of facilities to maintain water quality（Prepared at dam construction stage）
Surface aeration
水質保全対策の取り組み（建設時代）
equipment

Check dam

Selective water
withdrawal equipment

Check dam

Deep aeration equipment

Check dam８9

● The situation water bloom outbreak in 2002
(The reservoir totally covered with water bloom)

Cause of phytoplankton : Microcystis

Period : July to October
105

Special committee for water quality improvement
After massive outbreak of water bloom in2002
JWA called for setting up the special
committee for water quality improvementin Agigawa dam reservoir.
The members are:◆Academic professionals◆MLIT (River administrator)◆Local governments andmunicipalities concerned◆JWA ((RBO and operatespandmaintains Agigawa dam)

The 9th (last) meeting on March 11, 2011

was set up
It held meetings nine times and it wasdissolved after the last meeting on March
11, 2009.

Professor Matsuo

Professor Ishida

12

Mechanism of water quality conservation by aeration

Photic layer

Aphotic layer

1.Water bloom floatingon the reservoir surface
is taken into the deep
aphotic
i layer where thesunlight doesn’t reachby aeration.
2. Water bloom isdifficult to grow in theaphotic layer due toinsufficient sunlightsunlight.
3. Then massive
outbreak of water
bloom is curbed.
136

Two types of aeration equipment

Type 1 : Water level adaptable type(Mobile type)Type 1Type 220m

Type 2 : Not water level adaptable type(Fixed type)
14

Nine aeration equipment newly installed to improve water quality
in the reservoir
Water level adaptable type (mobile type)
Not water level adaptable type (fixed type)【Aeration equipment arrangement plan】
157

The effect by aeration equipment in summer, 2010

Before installation

Aeration equipment working

In summer, 2002

After aeration

After installation
In summer, 2010

Water bloom outbreak was evaded by curbing phytoplankton increase afterinstallation of aeration equipment
16Efforts to reduce pollutant load in the reservoir area
Agigawa Dam Operation and Office set up the cconference to try to reduce
pollutant load, nutrient salt etc., which is flowing into the reservoir, byimplementing enlightenment programs with collaboration of other organizations
concerned on July 29, 2009. The conference had the meetings three times so far
on July 1,
1 2010 and July 15,
15 2011 including set-up
set up meeting.
meeting

Reductionof drain of waste
生活排水対策のwater,
detergent use etc.
啓発活動の推進

耕地系
Reductionof useof chemicals
対策の andfertilizers
推進

目標削減 ofAccomplishment
targeted
reduction
負荷量
負荷量のof pollutant load
達成

山林のProper forests
適適正maintenance
管理

Further development of
下水道等の処理施設
swagesystemの一層の拡充

The special conference
set-up (July 29, 2009)178

Enhancing awareness of water improvement and revitalizing local
community by kushinsai (spinach or kang kong) cultivation on thereservoir
What’s kushinsai ?

・It’s home is Southeast Asia
・It’s another name is “Morning glory”
・It’s rich in vitamin and mineral

Flower of kushinsai

It contains four times more of calcium, five times more ofvitamin A and twice more of vitamin C than spinach does.

Cross section of the stem

Kushinsai

18

Roles of each organization
Started from 2004
Agigawa Dam Operationand Maintenance Office・Offering boats for activities on thereservoir
・Providing necessary materials

Award for the activities the past

●December 20, 2007
●M 21,●May21 2010
●July 1, 2010
●January 26,2011

Ena Agricultural
High school・Monitoring
M it i growthth offkushinsai
・Giving advice on how togrow kushinsai

Improvement of water quality inthe reservoir
Revitalizing local community

・Taking care of kushinsai
・Selling kushinsai

Ena City・Giving financial and personnel support

Local resident
199

Activities last year (2010)
Kushinsai planting (June 30)

Harvest of kushinsai
July 30，August 8 &18, September 17&24，
October 1&22

Kushinsai cleared off
on November17

Only leaves ofkushinsai harvested

20

Record of activities
2004

・Agigawa Dam Operation and Maintenance Officestarted kushinsai project with Ena Agricultural HighSchool2005

・ Agigawa Dam Operation and Maintenance Officecalled for local residents’ participation

2006

・Developed kushinsai project as the joint activity withlocal community
・Started selling kushinsai
・Promoted kushinsai at local events etc.

2007～ ・ Agigawa Dam Operation and Maintenance Officestarted growing kushinsai with local residents
・Continued to sell kushinsai・Continued to promote kushinsai at local events etc.
2110

• Network of Asian River Basin Organization was initiated by AsianDevelopment Bank (ADB), ADB Institute (ADBI) and Japan Water
Agency (JWA).
• Formally
Fll announced
d byb signingi i theth LOI on March
M h 21,21 2003,
2003 during
d i theth
3rd World Water Forum at Kyoto-Shiga, Japan.
• Established on February 24-26, 2004 in Malang, Indonesia

Letter of Intent for NARBO

The 1st NARBO General Meeting in 2004

Ownership is the basis of network activity

22Our Goal
To help to achieve IWRM in river basins throughout Asia.

ObjectiveT strengthen
Totth ththe capacity
it andd effectiveness
ff ti
off RBOs
RBO ini promoting
ti IWRM
and improving water governance, through training & exchange ofinformation and experiences among RBOs and their water sector
agencies & knowledge partner organizations.

Ownership is the basis of network activity

2311Members from 76 organizations in 16 countries

807060504030
201002004

20062008
countries

2010
organizations

24

Five major activities of NARBO

Information Sharing Activity
NARBO Web-site & NARBO Newsletter & Annual Report

Thematic workshop
Thematic Workshop on Water Allocation &Water Rights in Philippines

Twining Program

IWRM Training Program

RBO Performance
Benchmarking

Twining Program between
JWA & Indonesia NARBO

1st IWRM Training
Program in Thailand

Benchmarking Workshop
in Indonesia

2512

Information Sharing Activity
Newsletter
Annual Report
Issued 21times
Issued every year

26

Thematic workshop
Total 200 peoples participated.
 Water Allocation and Water Rights ; 5 times Sustainable Management for Water Resources Infrastructures; 4 times
 Water
Water--Relatedl d Disasteri
andd Its Management ; 2 timesi

IWRM training
Six times Training & Around 100 peoples participated2713

Twining program
JWA, K-Water, Indonesia NARBO, MASL andVi t Nam
VietN
NARBO

30 staff members have been exchanged.

28

4th General Meeting
Date: 8-12 November, 2010
Venue: Makassar, Indonesia
Participants: Approx. 100 water professionals from 18 countries

2914

Thank you very much for listeningandgiving me the opportunity

115