Rokugo and Shichigo moats are important agricultural waterways that supply water from Hirose River of Natori River system to the rural area in the east of Sendai City. These waterways were excavated and opened in the Edo Period and used as the moat of Wakabayashi Castle, which was where Masamune Date lived in his final years. They were important artery waterways for supplying water for agriculture, disaster-prevention and daily living. However, due to the advancement of urbanization, they were changed into culverts in some parts and the water environment was extremely deteriorated by dumped-waste and human sewage inflow.
To improve the waterfront spaces and water environment, a "non-irrigation period flow examination" to flow as much water as possible even in the non-irrigation season was started by Sendai City mainly in 1999. This approach was institutionalized in the river law in March 2006 as "environmental flow" aiming at improving the local water environment. Shichigo moat was designated as one of the best 100 canals in Japan.
By JRRN-secre | Category: History and traditional restoration,Tohoku | Comment(0) | Trackback(0) |
Date: 2011.09.10 18:30
In Komaki River, the water quality was deteriorated by urbanization and the river was named the "dirtiest river in Yamagata Prefecture" each year from 1996 to 1999. People in this area suffered from the serious deterioration of the water environment.
Under the circumstances, local residents voluntarily established "a group to clean up the Komaki River of Sakata City" and are conducting purification activities earnestly. As an approach to utilize the existing agricultural water and the agricultural facilities to improve the waterfront environment, a project to flow the purified water (ambient water) from Mogami River to Komaki River by changing the place where agricultural water is discharged started in 2007 for the first time in Japan. Thus the water quality has been improved.
By JRRN-secre | Category: Water quality Restoration,Tohoku | Comment(0) | Trackback(0) |
Date: 2011.09.10 18:14
As for Aka River running through Yamagata Prefecture and flowing into the Japan Sea, the number of migratory fish including oncorhynchus masou has decreased which is caused by migration prevention due to the groundsill and the disappearance of deep pools, which provide a valuable habitat. Along with the thick growth of trees such as Robinia pseudoacacia, the bar area is decreasing and the riparian part shrinking, thus the river landscape unique to Aka River has been lost.
For this reason, a nature regeneration project including the improvement of fish passes and Robinia pseudoacacia extermination tests is being conducted to secure the continuity of the river, conserve and create the river environment and regenerate the original nature of Aka River.
By JRRN-secre | Category: Nature oriented restoration,Tohoku | Comment(0) | Trackback(0) |
Date: 2011.09.10 17:56
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.
By JRRN-secre | Category: History and traditional restoration,Tohoku | Comment(0) | Trackback(0) |
Date: 2010.09.10 18:43
