Asian River Restoration Network (ARRN)

The Asian River Restoration Network was established in Nov. 2006 to support the exchange of information relating to environmental restoration of rivers and watersheds. JRRN has a role of ARRN secretariat currently.

Go to ARRN website

Contact us (Secretariat)

Lofty Chuoh Bldg., 7th Flr.

17-24, Shinkawa 1cho-me, Chuo-ku, Tokyo 104-0033, JAPAN

Foundation for Riverfront Improvement and Restoration
Tel: +81-3-6228-3860
Fax: +81-3-3523-0640


< 2010.9:World's WATERFRONT:JAPAN Monthly Archive >

Restoration of Nakashima ( Nagasaki City, Nagasaki Prefecture)

"Megane Bridge" over Nakashima River is the oldest arch-shaped bridge in Japan, designated as a national important culture asset. It is one of the main sightseeing spots of Nagasaki City and many tourists visit there.
In Nakashima River Water Control Plan, it was required to remove the bridge in order to widen the river channel. Based on the citizens’ opinions and as a result of an experiment with a model, however, it was determined to conserve the bridge at the present location by constructing a bypass waterway on either side to flow down flood water safely. Today the area around the bridge has been improved as Nakashima River Park, which is a place of recreation and relaxation.

Restoration of Tafuse River, Ishii Flume (Saga Prefecture)

Ishii Flume was constructed to secure the household water supply in Saga castle town and the agricultural water supply in Saga Plain in the Edo Period approximately 400 years ago, when people frequently suffered from droughts and water supply stoppages.
Over a period of approximately 350 years from that time until 1960 when Kawakami head works were constructed upstream, it had been used as a water utilization facility. In 1963 it was damaged by a great flood.
Later, a historical waterfront improvement project was started in Ishii Flume area through collaboration between Saga Prefecture, Saga City, Yamato Town and Ministry of Land, Infrastructure, Transport and Tourism.
Today, activities are being conducted under the theme of "the water flow of the homeland toward tomorrow again" to hand the important river civil engineering technology on to future generations, learn the history of Saga's water and land development and create an local community base where people can enjoy Kase River waterfront environment with rich nature by conserving, regenerating and utilizing Ishii Flume, a valuable cultural heritage.

Restoration of Yanta River (Shirakawa City, Fukushima Prefecture)

Yanta River is a class A river flowing from the mountainous area of Saigo Village of Fukushima Prefecture and joining Abukuma River. It runs east and west through the south part of Shirakawa City.
Since it was designated as a target river of the homeland river restoration project, efforts have been made for the river restoration for water control and environmental improvement around the river from the viewpoint of urban development.
Yanta River was largely damaged by concentrated heavy rain in August 1998. After that a "special emergency project against serious river disasters" was carried out. As a result of the promotion of a river restoration project called "the homeland river restoration project" under the theme of "The Yanta River, a clean stream with history and atmosphere", the local community has been vitalized and the natural environment conserved.

Restoration of Otaru Canal (Otaru City, Hokkaido)


Current condition(Photo by Michiya Tannai, Aug. 2009)

Otaru Canal was completed in 1923 as a port facility. As it was constructed by reclaiming offshore other than by digging inland, it is characterized by a gently-curved shape in a fan-like form other than a straight-line shape. It played the important role of loading and unloading cargoes between ships berthed in the port and warehouses. However, in postwar days, the mission was ended because the pier of the port was constructed.
In 1986, after the controversy as to whether to reclaim it or not over ten-odd years, part of it was reclaimed, half of the canal in width was changed into a road and walkways and parks were constructed. In this way Otaru Canal was regenerated into the present form. In the walkways, 63 gas lamps were built and the stone warehouses along the canal were conserved as they were. At nightfall gas lamps are lit and the stone warehouses are lit up and an atmosphere different from that in the daytime can be seen.

Restoration of Shimabara Spring and waterway (Shimabara City, Nagasaki Prefecture)

Shimabara City, which is likened to a small Kyoto surrounded by rich nature of the sea and the mountains, was called "a lagoon city" from old times because water cultivated by the Unzen mountain chain sprang out in many places in the city. However, Shimabara was greatly damaged by the eruption of Mount Unzen-Fugen. Since then, the reconstruction of the city has been promoted by attaching weight to "water".
Urban development under the theme of "water" was started and pocket parks, public drinking fountains, ponds, objet d'art, etc. have been constructed. Today, efforts are made to secure good landscapes and pleasant and comfortable pedestrian traffic lines and form attractive urban centers to collect visitors by improving the facilities using springs seen in various locations in the city through the Shimabara City spring network improvement project.
Shimabara Spring won the "Handmade Homeland Award" and was selected as one of the 100 water hometowns and 100 famous waters.

Restoration of Nishikawa and Edagawa channels (Okayama City, Okayama Prefecture)

Nishikawa Channel and its tributary Edagawa Channel take the water from Asahi River as the Asahi River joint canal, running southward through the center of Okayama City. They provide irrigation water for the paddy field spread in the south of the city. On either side of these canals, a water amenity park containing walkways, summerhouses, corridors over the waterway, etc. was constructed. It is popular among citizens as an esplanade.
In the Nishikawaryokudo, people enjoy the firefly canal created by dividing the water, a wind-up doll using a waterwheel, a cascade and a terrace over the water. In the Edagawaryokudo, a calm space is provided, where stones produced in Okayama Prefecture are positioned in a Japanese garden style.
Nishikawa Canal was designated as one of the best 100 canals in Japan.

Restoration of Kuratsuki Channel (Kanazawa City, Ishikawa Prefecture)

Kuratsuki Channel is a waterway 1,500 m in total length running from the center of Kanazawa City, Ishikawa Prefecture to the northwest area. In ancient times, it was used for irrigation and fire prevention for the castle and as the motive energy of the waterwheel to squeeze canola oil. Even today the rural area extending from the center of Kanazawa City to the northwest part is irrigated by this canal. In the urban area, it is used as water for fire prevention and for agriculture downstream.
In 1993, the channel was partially opened and a pocket park was constructed in the neighborhood of Kakinokibatake and in 1999 it was opened in the district between Korinbo and Takaoka Town. This helped to create a pleasant and lively atmosphere in the central urban area. Kuratsuki Channel was designated as one of the 100 best canals in Japan.

Restoration of Ibo River (Tatsuno City and Himeji City, Hyogo Prefecture)

Ibo River in Hyogo Prefecture flowing into Seto Inland Sea had a poor record: it was designated as the 3rd- to 5th-worst river in Japan in terms of water quality because the wastewater was discharged from households and the local industries such as leather product makers.
Under the circumstances, construction of a sewage system was promoted in the Ibo River Basin and the sewage system penetration rate was improved. In addition, the whole quantity of the leather makers' wastewater has been accepted by the water treatment facilities since 1994. As a result, Ibo River made rapid progress in recovery and gained the 2nd-best place in water quality in the Kinki region in the following year. It was also designated as one of the "100 revived waters". Today, the ascent of natural plecoglossus altivelis was observed for the first time in 40 years and the recovery of a clean stream of Ibo River was welcomed by local people. A fishing contest and river-rafting held by a local group is becoming popular year by year and the connection between the local community and the river has been revived.

Restoration of Sana River (Toyokawa City, Hoi County Kozakai Town and Toyohasi City Aichi Prefecture)

Sana River running through the eastern Mikawa area of Aichi Prefecture became so contaminated that the BOD was 60 mg/l, which was measured at the environmental basing point located downstream in 1978. This was because of the urbanization in the peripheral area that occurred during the decade starting in 1965. However, the construction of the sewage system was started in Toyo River Basin including Sana River Basin in 1980 and since then the water quality has been largely improved along with the progress of the sewage system improvement.
Today, children playing with water can be seen and a project to change the dike into a flower corridor is being promoted by community residents. Also, this river has been selected as one of the "100 revived waters", thus it is being changed into a river cherished by the local people.

Restoration of Fushimi and Takahashi River (Kanazawa City, Ishikawa Prefecture)

In Fushimi and Takahashi Rivers running in the southern part of Kanazawa City, a serious problem of water quality deterioration was caused by the rapid urbanization of the surrounding areas. The water quality was such that the BOD exceeded 10 mg/l but it was improved to approximately 3 mg/l by the construction of a sewage system that started in 1976.
Today, the ascent of salmon is seen and the former clear stream has been revived. The "river festival" is held by the local people and the river space has become a place for recreation and relaxation for citizens.
Fushimi and Takahashi Rivers were recognized as rivers in which the water environment was conserved and recovered by the sewage system and designated as one the "100 revived waters."

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