◎ Abridged Chronological Table of Koriyama City Waterworks ◎Western calendar Japanese calendar
1722
1770
1882
1887
1889
1890
1901

Kyoho 7
Meiwa 7
Meiji 15
Meiji 20
Meiji 22
Meiji 23
Meiji 34

1907
1909

Meiji 40
Meiji 42

1912

Meiji 45

1924

Taisho 13

1945

Showa 20

1947
1950
1953
1962

Showa 22
Showa 25
Showa 28
Showa 37

1965

Showa 40

1967
1968

Showa 42
Showa 43

1969
1971

Showa 44
Showa 46

1973

Showa 48

1978
1979

Showa 53
Showa 54

1980
1982

Showa 55
Showa 57

1983

Showa 58

1989
1991

Heisei 1
Heisei 3

1994
1995

Heisei 6
Heisei 7

1997
2001
2003

Heisei 9
Heisei 13
Heisei 15

2004
2005
2008

Heisei 16Heisei 17
Heisei 20

2010

Heisei 22

2011

Heisei 23

2012

Heisei 24

EventsBuilt the Saranuma Waterworks by reconstructing the Saranuma (marsh).
Built the Yamasuido (spring waterworks originating from a well dug on hills) from Hosonuma Nishi.
Water was transferred to the Asaka Canal, thereby increasing the amount of water stored in the Saranuma (marsh).
Those interested who lived in neighboring areas devised a plan for the Tadano Waterwoks.
The areas became Koriyama Town. Started to build the Tadano Waterworks.
The Tadano Waterworks were completed.
A bill for the town-operated Saranuma Waterworks was submitted to the Town Council and the Town
Council adopted the bill for the town-operated works.
A bill for improving the waterworks was adopted. A plan for water mains made of iron pipes was chosen.
A bill concerning a bond issue for the laying of waterworks and a change in the method of reimbursement of
the bond was adopted thanks to the resolute decision made by Mayor Kyujiro Imaizumi. An application forthe bond issue for the laying of waterworks was approved.
On April 1, water supply was started from the Toyota Water Purification Plant. With the completionof the water purification plant, the Saranuma Waterworks and Tadano Waterworks became disused.
The first expansion project was launched. The town was incorporated as a city. The drawing of water fromthe Ousegawa (river) was permitted by the prefectural governor.
The quality of water in the wells inside the city was inspected in preparation for air raids. Some water supply
plants were damaged by air raids. End of World War II.
As a post-war reconstruction project, repair of the damaged water supply plants was started. (- Showa 24)
The second expansion project was launched.
The Local Public Enterprise Law was applied to the waterworks. Corporate accounting was adopted.
A commemorative ceremony for completion of the second expansion project and the 50th anniversary washeld. The third expansion project was launched. A new office building for the waterworks was completed.
A petition for taking water from Lake Inawashiro was made to the prefectural governor. The fourth
expansion project was launched. A new Koriyama City was born.
The fifth expansion project was launched. Construction work for the Horiguchi Water Purification Plant was started.
Change in the Atami Waterworks Expansion Project was approved. Concerning the division of the spots for thedrawing of water from the Ousegawa (river), permission from the Tohoku Regional Construction Bureau wasobtained. The drawing of water from the Fukasawagawa (river) was permitted by the prefectural governor.
A change in the water rate system was made to adopt a water rate system using meter size.
The Horiguchi Water Purification Plant was completed. A commemorative ceremony for the 60thanniversary of the establishment of the waterworks was held.
Sole water rights were obtained through permission to draw water from Lake Inawashiro from the Hokuriku Regional
Construction Bureau and permission to draw water from the Minamigawa (river) from the Tohoku Regional Construction Bureau.
The sixth expansion project was launched. The Atami Waterworks Expansion Project was completed. The
drawing of water in Hamaji was permitted by the Hokuriku Regional Construction Bureau.
A dedicated water transfer tunnel was completed.
A ceremony for transferring water to the dedicated water transfer tunnel was held. The drawing of waterfrom Lake Inawashiro was started.
The seventh expansion project was launched.
As a commemorative project for the 70th anniversary of the establishment of the waterworks, the "Shimizu
Pond" in which the waterworks had originated was put in order.
With the arrangements made by the prefectural government, concerning the obtainment of water rights fordrawing water from Lake Inawashiro, an agreement was reached with Tokyo Electric Power Company. The
contract was signed in the amount of 268 million yen.
Construction work for the Arai Water Purification Plant was started.
A commemorative ceremony for the 80th anniversary of the establishment of the waterworks andcompletion of the office building of the Waterworks Bureau was held.
Permission to draw water from the Miharu Dam was obtained from the Tohoku Regional Construction Bureau.
Disaster recovery support was provided to the areas affected by the Great Hanshin Awaji Earthquake. TheKoriyama City Waterworks Project Management Deliberation Council was established.
Water supply from the Arai Water Purification Plant was started.
A commemorative publication for the 90th anniversary of the establishment of the waterworks was issued.
The second phase of the seventh expansion project (Fiscal Year 1998 - Fiscal Year 2002) was completed.
The facility capacity of the Arai Water Purification Plant was increased to 42,000 m3/day.
Disaster recovery support was provided to the areas affected by the Niigata Chuetsu Earthquake.
The nickname of the mascot of the Koriyama City Waterworks Bureau was determined to be "Kiraran."
The eighth project change was approved with a project cost of 26.4 billion yen. A project for integration ofthe purification plants was started.
The "Koriyama City Waterworks Project Basic Plan - Koriyama Water Vision" was devised (period of theplan: Fiscal Year 2010 - Fiscal Year2019)
The Great East Japan Earthquake (earthquake off the Pacific coast of Tohoku; M9.0) caused stoppage of watersupply to about 37,000 homes. Restored on April 1. Due to the accident at the Fukushima Daiichi Nuclear Power
Plant of Tokyo Electric Power Company, radioactive material monitoring inspection of tap water was carried out.
Centennial of the establishment of the waterworks.

Koriyama City Waterworks BureauJanuary 2015 issue

TEL(024) 932-7643 FAX(024) 939-5807

Recyclable into paper

Lake Inawashiro and Hamaji Intake Tower

Centennial of the Establishmentof the Koriyama City Waterworksof the Koriyama City Waterworks- Together with our Citizens Towards the Next 100 Years -[ Toyota Water Purification Plant at the time of establishment ]Shining and Safe Water Will Be Delivered to Future Generations
Koriyama City
Waterworks Bureau

1-4, Toyota-machi, Koriyama-shi, 963-8016

E-mail: suidosomu@city.koriyama.fukushima.jp
Website: http://www.city.koriyama.fukushima.jp[ Toyota Water Purification Plant 2012 at the time ]Mascot of the Koriyama City
Waterworks Bureau"Kiraran"

Mascot of Koriyama City "Gakuto-kun"and his younger sister "Onpu-chan"

The Centennial of the Establishment of the Waterworks Has Been Reached
Koriyama was a posting station whose population was slightly more than 4,000 in Bunsei 10 (1827)(around the end of
the Edo era). It began with the development of Asaka in the Meiji era, and it is now a core city with a population of
more than 300,000.
In Meiji 11 (1878), as the first state-run project by the national government for the vocational aid for the family
members of the samurai class, the development of the Asaka wide plain and the construction of the Asaka Canal thatwould introduce the water of Lake Inawashiro into the Asaka Plain were started. As a result of completion of thisproject, clean water flowed into the Asaka Plain, which became a fertile land. This laid the foundation for thedevelopment of our city.
The waterworks of our city started its supply of water on April 1, Meiji 45 (1912) as the first modern waterworks inFukushima Prefecture, the 3rd in the Tohoku, and the 23rd in Japan, thanks to the blessings of the Asaka Canal, withits major source of water drawn from Lake Inawashiro. On April 1, Heisei 24 (2012) the centennial of theestablishment of the waterworks was reached.

History of the waterworks
1 Origin of the Koriyama waterworks ... Saranuma Waterworks
In the Kyoho era in which a village with a population of about 1,400 wasformed, the drinking water taken from wells, etc was in short supply. For
this reason, in Kyoho 7 (1722), the Saranuma (marsh), which had been
an irrigation pond, was used as a reservoir, and a distribution tank wasbuilt there, and water was drawn to each home through a bambootrough.

5 From a period of expansion projects to a period of maintenance and control
Since the first expansion project started in Fiscal Year Taisho 12 (1923), in order
to cope with demand for water that increased with development of the city,expansion projects were implemented several times.
In Fiscal Year Showa 48 (1973), the sixth expansion project was started in which theHamaji Intake Tower that directly took water from Lake Inawashiro and the watertransfer facilities up to the Horiguchi Water Purification Plant were put in order, andthe project was completed in Fiscal Year Showa 54 (1979). Completion of thisproject established the foundation of the waterworks projects of our city at present.
Now the eighth project including the "Water Purification Plants Integration
Project" and others have been underway since Fiscal Year Heisei 20 (2008), andthe "Water Purification Plants Integration Project" was completed in March Water transfer tunnel from Lake Inawashiro
Heisei 25 (2013).
This project involves stopping use of the Toyota Water Purification Plant, which has become too old for use, and tointegrate its functions into the Horiguchi Water Purification Plant. The project will enable water to be supplied
efficiently and in a stable manner with the enlargement of the areas to which water is supplied by means of the natural
flow-down method as well as a change into a duplex water transfer route, and thus further environmentally friendlyand disaster-resistant waterworks will be realized. Towards the next 100 years, safe and reliable tap water willcontinue to be delivered in the future. Our waterworks develop with our citizens.
<Elevated water tank in Hayama ><Construction work for the Horiguchi Water Purification Plant >Koriyama City
Water Purification Plant

Fifth expansion project

Old Toyota Water Purification Plant

A distribution tank in the Saranuma Waterworks

2 Seeking new waterworks ... Yamasuido
Since the Saranuma Waterworks contained little water during theperiod of rice planting, in Meiwa 7 (1770), wells were dug on hills such asin Shimizudai and Hosonuma, and the Yamasuido was built that drew
water by natural flow-down.
However, it was expensive to draw water, and there were only around 10
wealthy homes that used the waterworks. Several hundred homes in thevicinity went to these homes to get their water.

3 In search of a large quantity of high quality water (Tadano Waterworks)First expansion project(Fiscal Years Showa 42 (1967) - Showa 46 (1971))(Fiscal Years Taisho 12 (1923) - Taisho 14 (1925))< Construction work for the Hamaji Intake Tower>(March 2013 abolished)<Assembly work performed by a diver>Intermediate box, wooden pipe and top piecein the period of wooden pipe waterworks

In Koriyama Town around Meiji 20(1887), the silk industry was flourishing,
and with the growth of its population,
there arose the need for a large quantityof high quality water. Therefore, richmerchants at the time brought funds andset up the "Koriyama Waterworks Company."Thus the Tadano Waterworks werebuilt by connecting wooden pipes ofabout 10 km in length starting at 3 places
within the Tadano District in Ouse Town Wooden pipes of the Tadano Waterworks
at present, and the construction work
was completed in Meiji 23 (1890).

Horiguchi Water Purification Plant
Sixth expansion project (Fiscal Years Showa 48 (1973) - Showa 54 (1979))
Change in population served(1,000㎥) and total amount of water supply

50,00045,000Birth place of waterworks: Shimizu Pond

35,00030,000After Meiji 30 (1897), the wooden pipes of the Tadano Waterworks started to rot, andsince there was also rapid growth in the population of Koriyama, an even larger
quantity of high-quality water was needed.
And therefore, Mayor Kyujiro Imaizumi made a decision to establish the modernwaterworks, stating that "without putting the waterworks in good condition,
Koriyama will never become developed." He built the Toyota Water Purification
Plant by spending on construction work that cost 5 times (6 times at the time ofcompletion of the construction work) the total annual budget of the town (30,000 yen
at the time), and the water supply was started in April, Meiji 45 (1912) as a modern
waterworks.

25,000Population served (Population)

350,000

I can’t believe it has
increased this muchin 100 years!

40,0004 Foundation of modern waterworks ... Toyota Water Purification Plant

Total amount ofwater supply (1,000㎥)

300,000
250,000
200,000
150,000

20,00015,000100,000

10,00050,0005,000
Heisei 22(2010)

Heisei 12(2000)

Heisei 2(1990)

Showa 55(1980)

Showa 45(1970)

Showa 35(1960)

Showa 25(1950)

Showa 15(1940)

Showa 5(1930)

Taisho 10(1921)

Mr. Kyujiro Imaizumi

Meiji 45(1912)

0Atami Water Purification Plant

0(Fiscal Year)

Arai Water Purification Plant