2. A Brief History of Chiba Prefecture Waterworks

2. A Brief History of Chiba Prefecture Waterworks
such issues as how to acquire raw water, and how to
save on construction costs.
With the agreement of the communities concerned
an investigation committee consisting of specialists,
assemblymen, and the governor, as chairman, was
established in April 1933. It held discussions on the
project, and proposed that the prefectural waterworks
system should be designed for rational management,
with emphasis on technology and economics. In May
1933, an extraordinary session of the assembly adopted
this proposal unanimously. In June, permission for
construction of the Chiba Prefectural Waterworks. On
March 31, 1934, the Government granted permission.
Bonds had already been issued by the Ministry of
Finance to cover expenses of works was at last begun.
●Basic Plan
Chiba Purification Plant (presently the Chiba Pump Station)
elevated tank
■The Dawn of Public Waterworks
●Background
In the 1920s only one percent of the population of
Chiba Prefecture had access to public water. At that
time, people living in the region along Tokyo Bay, and
between the Edo River and Chiba City, took water
directly from wells and rivers.
Water from both of these sources was of inferior
quality. According to a 1930 report, water at twothirds of the wells tested was unsuitable for drinking.
Epidemics occurred frequently. In light of this situation
thirteen communities in the area, including the city of
Chiba, and the towns of Ichikawa and Matsudo, called
for introduction of modern waterworks.
●Establishment of Prefectural Waterworks
In response to these circumstances, then prefectural
governor F. Okada prepared a development plan for
the belt along the Edo River. A main foundation of the
plan was the waterworks system, which was assessed
from all possible angles, especially with respect to
the advantages and disadvantages of operation of the
system by the prefecture.
This led to a broader waterworks development plan
which covered all districts concerned, and dealt with
The basic plan called for a maximum daily water
supply of 37,500m3 to serve the needs of population of
250,000. The project was to be completed by the year
1951, at a cost of 3.5 million yen. Water intake sites were
located to the west in Matsudo town, by the Edo River
(the current site of the Kogasaki Water Purification
Plant) with plans calling for intake of 27,000m 3/day,
and to the east in the village of Miyako, Chiba district,
where intake of 10,500m3 from underground sources
was projected (the current site of the Chiba Pump
Station). In June, 1936, water service was commenced
to Chiba City where facilities were first completed. As
construction progressed, the other communities were
supplied one after another, with construction of the
entire system completed by December, 1941.
■First Expansion Project
After recovering from the devastation caused by
World WarⅡ, the region served by the waterworks
developed rapidly, and water demand rose sharply. In
order to alleviate shortages and stoppages in supply,
which were already occurring in the summer of 1952,
the first expansion project was initiated. However, the
acquisition of additional water sources proved difficult,
and for some time water shortages continued.
In April, 1955, an opportunity to acquire water rights
for an intake of 0.8m 3 /second from the Edo River
was created. Rights were granted in November, and
construction commenced in April, 1956. This expansion
project was designed to serve the needs of a population
of 458,000 with a maximum water supply of 123,750m3
by the year 1965. In fact, this urgent undertaking was
completed by 1962.
The major objectives of the project were to construct
Kuriyama Water Purification Plant (Kuriyama, Matsudo
City) with treatment capacity of 66,000m 3/day that
would take water from the Edo River, Ichikawa Water
33
November, 1966, giving the Prefectural Waterworks
Bureau a daily maximum capacity of 271,000m3.
■Third Expansion Project
Purification Plant with capacity of 9,000m 3/day and
Omiya Water Purification Plant with capacity of 6,750
m3/day that would take water from underground, to
acquire Imai Water Purification Plant with capacity
of 4,000m3/day and to increase the maximum supply
capacity of Chiba Pump Station by 500m3/day to supply
water to Ichikawa, Funabashi and Chiba areas. In June,
1958, water service from Kuriyama Water Purification
Plant was started to a segment of these areas and to
the entire areas by 1960, thus eliminating the shortage
and stoppage that have plagued the region for so long.
The total cost of the project was in excess of 2,760
million yen. The maximum supply capacity of the
total project reached to 123,750m 3/day, which was
approximately three times larger than that of earlier
facilities.
Even though work on the second expansion project
was completed a year ahead of schedule, urbanization
of the region accelerated at such a pace that the then
existing water service facilities would soon be incapable
of handling increasing demand. Accordingly, the third
expansion project was prepared and approved in
December, 1961, and work commenced in April, 1965.
The project proposed to serve a population of 1,214,000
by creating an additional daily water supply capacity
of 270,000m3 by the year 1970. The major components
of the project were construction of the Inba Intake
(located in Usuida, Sakura City), to take raw water
from Inbanuma Lake, a part of the Tone River
system, construction of the Kashiwai Purification Plant
(Kashiwai, Chiba City) with a capacity of 270,000m3, and
construction of Honda Pump Station (Honda, Chiba City),
for stabilization of water supply to districts including
the cities of Chiba, Funabashi and Ichihara, as well as
to strengthen the water supply capacity of the existing
Kuriyama Purification Plant and the Funabashi and
■Second Expansion Project
Rapid enlargement of the Keiyo coastal industrial belt
along Tokyo Bay caused further high growth in the
region. By 1961 the population had increased 385,000,
and daily maximum supplied water had reached
125,000m3. Water supply demand exceeded the limits of
the first expansion project before the target year 1965,
making water stoppage inevitable. Accordingly, the
second expansion project was approved in March, 1962,
and new construction begun in April.
The second expansion project proposed to serve a
population of 694,500 by creating an additional supply
capacity of 147,250m3 by the target year 1967. Major
programs implemented under this project were addition
of a water purification facility with treatment capacity of
12,000m3/day at Kuriyama Plant, installation of service
pipes to Chiba City, construction of an underground
water purification plant with 12,000m3/day capacity in
Anegasaki, Ichihara
City and increase
the capacity of the
existing underground
purification plants by
15,250m3/day.
The funds expended
on this project were in
excess of 6,030 million
yen, and all facilities
were completed in
44
Sonno Pump stations. The third project was completed
in March, 1972.
The project cost amounted to 15.3 billion yen and
resulted in a daily maximum capacity of 541,000m3.
■Fourth Expansion Project
To cope with the growing water demand, the fourth
expansion project was approved in March, 1971 and
commenced in April the same year. Subsequently, the
project has been revised three times to comply with the
regulations on underground water under the Pollution
Control Ordinance of Chiba Prefecture as well as to
cope with the change of water intake points established
to receive water supply from Kimitsu Water Supply
Authority and the lower water demand slowed down
by the Aggregate Demand Management Policy of the
national government. The final approval was issued for
the project in March, 1980, with the goal to meet the
water needs of a population of 2,794,000 by 1993 with
the maximum demand of 1,350,000m3/day.
Until the project was merged with the Hokuso Area
Waterworks in March, 1982, the capacity of Kashiwai
Purification Plant was increased by 285,000m3/day by the
construction of Kioroshi Intake Station (Inzai City) that
takes water from the Tone River, the capacity of Kogasaki
Purification Plant was increased by 33,000m3/day, and
the maximum water supply capacity was expanded to
395,000m3/day by receiving water supply of 77,000m3/day
from the Kita-Chiba and the Kimitsu Water Authorities
at Shonan Pump Station (Shonan, Higashi Katsushika
County) and Anegasaki Pump Station (Yushudai,
Ichihara City).
The project costs amounted to 129,330 million yen and
resulted in total daily capacity of 936,000m3.
■Hokuso Area Waterworks
Vigorous land development and housing project
construction on the part of the prefecture in response
to population increases brought on by the development
of the coast industries belt and the spill-over of
metropolitan growth into Chiba prefecture resulted in
disorderly urbanization of this area, and a shortage of
public facilities of all types. The prefectural government
responded to this situation by planning integrated
construction of necessary public facilities in future
urban developments. The results are seen in Narita
New Town (Narita City), Chiba New Town (Funabashi
City, Shiroi Town, Inzai City, Motono Village, and Inba
Village), which were developed in conjunction with the
construction of the New Tokyo International Airport.
Water service to the new towns, and the large
region surrounding the new international airport, were
undertaken by the prefecture at great cost. Acquisition
of adequate water supplies to meet high water
utilization in this area was the primary goal of the new
water supply project, which commenced in 1970.
This project proposed to serve a population of 400,000
by creating a daily maximum water supply of 190,000m3
by the target year 1986. As mentioned, this project was
united with the fourth expansion project for the Keiyo
area on March 31, 1982.
The major components of the Hokuso waterworks
project were the construction of the Kioroshi Intake
(at Kioroshi, Inzai City) in collaboration with the fourth
expansion project at Keiyo, to take water from the
Tone River system, the transport of raw water under
pressure to Hokuso Purification Plant (Motono Village)
and the supply of purified water from there to Chiba
New Town directly and Narita New Town including
the New Tokyo International Airport, via Narita Pump
Station.
This project, the cost of which has exceeded 22 billion
yen, has succeeded in supplying a daily maximum of
l26,700m3 water.
■Combined Fourth Expansion Project
efficient operation of facilities, to provide equitable
service charges and stabilized management and to
promote more efficient administration. On March 31,
1982, the new enterprise was approved, and on April
1, the projects were combined under the name Chiba
Prefectural Waterworks (Combined Fourth Expansion
Project).
The project had a goal to meet the water need of a
population of 3,194,000 by 1993 with the maximum
demand of 1,540,000m3/day.
Major plans of the combined project were the
construction of Takataki Intake Station (Yourou,
Ichihara City) that takes water from Takataki Dam
on the Yourou River water system, the construction
of Fukumasu Water Purification Plant (Fukumasu,
Ichihara City) that treats water of 90,000m3/day, the
addition of water reservoirs at Kashiwai and Hokuso
Water Purification Plants and expansion of Honda Pump
Station and Anegasaki Pump Station.
Over 145,300 million yen was invested in this project,
and the maximum supply capacity increased to
1,244,100m3/day in 1993.
■Chiba 21st Century New Waterworks Project
In 1993, which was the goal year of the combined
fourth expansion project, a plan for the Chiba 21st
Century New Waterworks Project was developed to
meet the expectation of users for waterworks with
higher quality, based on ① the growth of water
demand slowed down by the collapse of the "bubble"
economic boom, ②the superannuated Kogasaki Water
Purification Plant constructed at the time of the
foundation of the Waterworks, ③the needs for water
sources along the Boso Channel, and ④ the strong
needs of citizens for safe and quality water, and other
factors. The Project was approved by the Ministry of
Health and Welfare on March 31, 1994 and started in
April the same year.
The goal of this Project is to serve a population of
3,238,000 by 2010 with the maximum water supply of
1,440,000m3/day, which is lower than the goal of the
previous project by 100,000m3.
Major plans of the Project are construction of
Edogawa Water Purification Plant (presently : Chiba
Nogiku no-sato Purification Plant) by which the
role of the obsolete Kogasaki Plant and Kuriyama
Plant would be replaced, construction of a new
water purification plant for a new water source to
be secured along the Boso Channel, and sequential
introduction of an advanced water purification system
to all water purification plants to supply safer water
with higher quality.
In the past the bureau had managed the Keiyo
and Hokuso waterworks project separately, but it
was decided to integrate the two area so as to more
effectively utilize water sources, to promote more
55
Comparison ofof
Express
Project Project
and Daily Water
Supplied
Camparison
Express
and
Daily Water Supplied
160
（Actual
Wate Supply up to FY 2013）
（Actual Water Supply up to FY 2013）
Unit:10,000m3/day
4rd Expansion(combined)
Chiba 21st century New
waterworks Project
150
4rd Expansion for
Keiyo area
140
130
120
110
Actual Water Supply
100
90
80
70
3rd Expansion
for Keiyo area
60
50
40
2nd Expansion
for Keiyo area
30
W/S established in Hokuso area
1st Expansion
for Keiyo area
20
10
0
1952
1957
1962
1967
1972
1977
1982
1987
1992
1997
2002
2007
2012
Established and Approved Projects
Name of Water Supply System
Item
Keiyo area waterworks
Hokuso area waterworks Original project Current project
（
）
Works Establishment 1st Expansion 2nd Expansion 3rd Expansion 4th Expansion Establishment （4th Expansion/Combined） Chiba 21st century New
waterworks Project
Mar. 31. 1934 Nov. 10. 1955 Mar. 26. 1962 Dec. 28. 1964 Mar. 31. 1971 Mar. 31. 1970 Mar. 31. 1982 Mar. 31. 1994
Oct. 3. 1941
Date of
authorization
Aug. 24. 1959
Mar. 31. 1970 Mar. 30. 1974 Mar.29. 1978
Dec. 28. 1960
May. 9. 1979 Mar. 31. 1982
Mar. 3. 1980
discontinued
Mar. 31. 1982
discontinued
Target year
1951
1965
1967
1970
1993
1986
1993
2010
Population in service
area（Persons）
333,300
870,000
1,067,310
1,505,000
2,871,000
400,000
3,271,000
3,304,000
Population served（persons）
250,000
458,000
694,500
1,214,000
2,794,000
400,000
3,194,000
3,238,000
Percentage of population served
75
53
65
80.7
97.3
100
97.6
98
Max. daily supply
（㎥）
37,500
123,750
271,000
541,000
1,350,000
190,000
1,540,000
1,440,000
Max. daily supply
per capita（ℓ）
150
270
390
446
483
400
482
445
※
Construction cost（1,000yen）
※
Date supply started
3,500
June 1936
Edo river
2,767,000
5,943,000
Nov. 1955
Edo river
Aug. 1964
Edo river
15,294,000 129,332,000
22,004,000 145,383,000（965,735,432）planned
July 1968
Jan. 1972
Tone river
Apr. 1971
Edo river
Underground water Underground water Underground water Inbanuma lake Tone river
Underground water Inbanuma lake
Water sources
Tone river
Apr. 1982
Edo river
Underground water Tone river
—
Edo river
Tone river
Inbanuma lake Inbanuma lake
Yourou river
Yourou river Yourou river
Water received
Water received Water received
（Kita-Chiba and
（Kita-Chiba and Boso-dousuiro P.P.
Kimitsu W/S）
Kimitsu W/S） （Kita-Chiba and Kimitsu W/S）
Kogasaki P.P. Kuriyama P.P. Kuriyama P.P. Kashiwai P.P. Kogasaki P.P. Hokuso P.P. Kashiwai P.P. Kashiwai P.P.
Chiba P.P.
Water purification plants
expanded/constructed
Ichihara P.P.（expanded）
（expanded）
Anegasaki P.P.
Kashiwai P.P.
Fukumasu P.P. Hokuso P.P.
（expanded）
Hokuso P.P.（expanded）
Omiya P.P.
Imai P.P.
（acquisition）
（expanded）（expanded）
（expanded） Edogawa P.P.
Boso-dousuiro P.P.
Figures with the
6
※
mark are based on the actual results.
■The business promotion
After receiving authorization to operate water
services (authorization to change the founding business)
in accordance with the "Chiba 21st Century New
Waterworks Project," Chiba Prefectural Waterworks has
business
promotion
■Theworked
since
to provide
a variety of services such as
the
management
of water
purification
as outlined
After
receiving
authorization
toplants
operate
water
Due
to
the protracted
economic
slump
following
the
in
the "Chiba
Waterworks
Medium-Term
services
(authorization
to change
business)
collapse
of
the Prefectural
bubble economy
inthe
thefounding
1990s
and
advent
Management
(2006-2010)."
in
with
theand
"Chiba
Century
New
of aaccordance
decliningPlan
birth
rate
aging21st
population,
Japan
is
Some
water
services
have
been
suspended
because
of
Waterworks
Chiba
Prefectural
Waterworks
has
transitioning Project,"
from a social
and
economic
structure
based
the
slowdown
of provide
the increase
in water
supply demand,
since
worked
to
a variety
of services
such
as
on mass
production
to one
that
emphasizes
quality,
caused
by
the
protracted
economic
slump
andasincreased
the
management
of water purification
outlined
requiring
the reorganization
of theplants
management
of
water
awareness.
However,
the water
in
the conservation
"Chiba
Waterworks
Medium-Term
various
fields. Prefectural
supplied
population
is still Waterworks
increasing, and
water supply
Management
Plan
(2006-2010)."
The Chiba
Prefectural
Bureau’s
2011
demand
will
continue
to
increase
over
the
next
10ofyears
Some water services
have been
suspended
because
of
Medium-Term
Management
Plan for
the period
2011
according
predictions
for water
supply
demand
based
the
slowdown
of basic
the increase
in water
demand,
to 2015
settofive
objectives
in
eachsupply
business
field,
on
latest
Because
ofand
thisslump
expected
increase,
caused
the data.
protracted
economic
and setting
increased
andthe
theby
Bureau
is effectively
efficiently
in
there
is
a
need
to
make
continuous
plans
for
facility
water
awareness.
water
motion conservation
the policies and
initiatives However,
necessary the
to achieve
management
and water
sources.
supplied
population
is still
increasing, and water supply
these goals.
Therefore,
the
"Chiba
Prefectural
demand
will continue
to increase over
the plan,
next Medium10
By steady
implementation
ofWaterworks
this
weyears
will
Term
Management
Plan
2011"
was
developed
to inherit
according
to predictions for
supply demand
based
respond appropriately
to water
the changing
times,
and
the
accomplishments
of
thefull
medium-term
management
on
the
latest
data. Because
of and
this active
expected
increase,
continue
to support
the
lifestyles
of
plan
that
expired
at
the
end
of
March
2012,
and
there
is acitizens
need toasmake
plans and
for further
facility
Chiba’s
well continuous
as provide safer
highercultivate
theseand
accomplishments.
management
water
sources.
quality water,
with
the aim
of being a sustainable lifeline
Through
this
new
business
operations
plan,
Therefore,
thebusiness
"Chiba
Prefectural
Waterworks
Mediumwith
a stable
foundation
that ispolicy
suitable
for we
an
will
continue
to
provide
customers
with
a
stable
supply
Term
Management
advanced
society. Plan 2011" was developed to inherit
of
and good quality
water.
thesafe
accomplishments
of delicious
the medium-term
management
plan that expired at the end of March 2012, and further
cultivate these accomplishments.
Through this new business operations policy plan, we
will continue to provide customers with a stable supply
of safe and good quality delicious water.
promotion of quality water production, etc.)
Objective 2:
Waterworks dedicated to customers through high- quality
service and technology
③ Promote customer service
(Expansion ofofgood
public
relations;
exploration
new
promotion
quality
quality
water
water
production,
production
etc.) of
etc.)
customer
Objective
2: payment methods)
④
Pass technology
onto
the next generation
Waterworks
dedicated
to customers
through high- quality
quality
(Conduct
practical technical training)
service
and technology
Objective
3: customer service
③
Promote
Waterworks
during
earthquakes
other of
emergency
(Expansion
of
of public
public
relations;
relations;and
reflection
exploration
customer
of new
situations
feedback
customer in
payment
business
methods)
operations)
⑤ Pass
Improve
crisis management
system
④
technology
onto the next
generation
(Strengthen
and improve
emergency
water
supply
(Conduct practical
technical
training;
training)
consider
system;
reinforce
initial
response
system)
Objective
development
3:
of hands-on training facilities)
⑥
Secure
flexibility
systemand
in case
of emergency
emergency
Objective
Waterworks
3: water
during
earthquakes
other
(Maintenance
of
backup
system
between
water
situations
Waterworks during earthquakes and other emergency
purification
plants
and
pump
stations)
⑤
situations
Improve crisis management system
Objective
4: crisis
⑤
Improve
(Strengthen
and
management
improve emergency
system water supply
Eco-friendly
waterworks
system;
(Strengthen
reinforce
and improve
initial response
emergency
system)
water supply
⑦
Promotion
of environmental
measures
⑥ Secure
system;water
reinforce
flexibility
initialsystem
response
in case
system)
of emergency
(Promote
energy
conservation;
utilize
renewable
⑥
Secure
(Maintenance
water
flexibility
of backup
system
system
in case
between
of emergency
water
energy)
purification
(Maintenance
plants
of backup
and pump
system
stations)
between water
Objective
5:
Objective
purification
4:
plants and pump stations; security of
Waterworks
with a maintainable,
stablesuppliers)
management
Eco-friendly
water flexibility
waterworks
system with water
⑧
Secure
and
cultivate
human
resources
Objective
⑦ Promotion
4:
of environmental measures
(Organized
employment
of human resources;
employee
Eco-friendly
(Promotewaterworks
energy
conservation;
utilize renewable
development)
training
and
skill
⑦
Promotion
energy)
of environmental measures
⑨
Improve
efficiency
Objective
(Promote
5: operation
energy conservation;
utilize renewable
(Secure
efficient
business
operations;
promotion of
Waterworks
stable management
energy) with a maintainable,
computerization)
⑧ Secure
Objective
5: and cultivate human resources
⑩
Reinforce
management
system
(Organized
employment
of
human
resources;
employee
Waterworks
with
a maintainable
stable
management
(Cost
reduction
attentive
quality reassurance;
andcultivate
skill development)
⑧ training
Secure and
humantoresources
of
stable
revenue
and financial
⑨
Improve
operation
efficiency
security
(Organized
security
of human
resources;reform)
employee
(Secure and
efficient
operations; promotion of
training
skill business
development)
⑨ computerization)
Improve operation efficiency
⑩
management
system
Reinforce
(Secure efficient
business
operations; promotion of
(Cost reduction attentive to quality reassurance;
computerization)
（2010）
Admitted
water
sources
security
ofmanagement
stable revenue
and financial reform)
⑩
Reinforce
system
(Cost reduction attentive to quality reassurance;
Water Rights
Intake
Facilities
security
of stable revenue
and financial
reform)
Rivers
Water Sources
Introduction of Advanced Treatment System (Ozone Generators)
This system uses ozone, which has strong oxidation
abilities, to break down organic matters that might
affect water quality. The system then uses active carbon
to remove these organic materials through absorption.
Introduction of Advanced Treatment System (Ozone Generators)
<Basic
Objectives
Main
Initiatives
of the
Chiba
This system
uses and
ozone,
which
has strong
oxidation
Prefectural
Waterworks
Medium-Term
Management
abilities, to break down organic matters that might
Plan 2011>
affect
water quality. The system then uses active carbon
Objective
to
remove 1:these organic materials through absorption.
Waterworks that provide safe, good quality water
① Secure
a safe water
supplyInitiatives of the
<Basic
Objectives
and Main
the "Chiba
Chiba
(Updating
water purification
plant andManagement
pump station
Prefectural
Waterworks
Medium-Term
Plan facilities,
2011>
2011"> updating and maintenance of pipes.)
②
Provide
Objective
1: safe, good quality water
(Introduction
of the advanced
system:
Waterworks
that provide
safe, good treatment
quality water
①
②
Secure a safe water supply
(Updating water
(Stabilization
of the
purification
water source;
plant and
renewing
pump station
water
plant and
station facilities)
facilities,
purification
updating
andpump
maintenance
of pipes.)
Provide safe, good quality water
(Introduction of the advanced treatment system,
system:
Admitted water sources(m /sec) (m /day)
3
3
(Purification Plant)
（2014）
Water Rights
Intake Facilities
Rivers
Water
Sources
Edosources
River
（2010）
1.060
Yagiri Intake Facilities
Admitted
water
（㎥／ s） （㎥／日） （Purification Plant）
Edo River From agricultural use
0.470 258,200 （Chiba Nogiku-no-sato P.P,
1.0601.460
EdoNaka
River
River, EdoRiver
Kuriyama
P.P）
Water Rights Yagiri
Intake
facilities
Intake
Facilities
0.484
Naramata
Dam
Rivers
Water
Sources
258,200 （Chiba
Edo River
Nogiku-no-sato
(Purification Plant)P.P.,
From agricultural use 0.470
3
3
(m /sec) (m /day) Kuriyama P.P.）
Naka River, Edo River 0.976
Tone River salinity
2.070 178,800
Inba Intake facilities
barrier
(Kashiwai
P.P facilities
east
side)
Edo
River
1.060
YagiriIntake
Intake
Facilities
Tone River
Inba
2.070
178,800
Edo River
From barrier
agricultural use
Nogiku-no-sato
P.P,
0.470 258,200 （Chiba
salinity
（Kashiwai
P.P. east side）
Kuriyama P.P）
1.460
Tone River Naka
Tone
ToneRiver,
RiverEdoRiver
salinity
Tone River
River
Kioroshi
barrier
1.4101.410
Kioroshi Intake
IntakeFacilities
facilities
salinityKawaji
barrier
(Hokuso
P.P,
dam 1.9691.969422,200
361,600 （Hokuso
P.P.,
Kawaji dam
Kashiwai
P.P west
west side）
side)
Naramata
dam 1.5100.484
Kashiwai
P.P.
Tone
River salinity
Inba Intake
facilities
Yunishigawa dam
2.070 178,800
Yunishigawa
barrier dam
0.325
(Kashiwai P.P east side)
Takataki Intake
Intake Facilities
facilities
Yourou
Takataki
Takataki
dam dam 1.1001.100 95,000
Yoro River
Takataki
95,000 （Fukumasu P.P.）
Tone
River Tone
River
River salinity
(Fukumasu P.P)
barrier
1.410
Kioroshi Intake Facilities
Naramata dam
0.484
Kashiwai P.P west side)
Yunishigawa dam
0.325
Takataki dam
1.100
10.348
893,600
TotalTotal
Kawaji dam 11.049
1.969954,200
361,600
Yoro River
Total
95,000
(Hokuso P.P,
7
Takataki Intake Facilities
(Fukumasu P.P)
10.348 893,600
77