The Nagaragawa Estuary Barrage

• Major Environmental Surveys Carried Out in Relation to the Nagaragawa Estuary Barrage Project
• Survey Prior to Starting the Project
• Surveys Carried Out During the Project
• Surveys Carried Out on Completion of the Barrage
• Surveys Carried Out After the Barrage Went into Operation

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Surveys Carried Out After the Barrage Went into Operation
［Nagaragawa Estuary Barrage Monitoring］

With a view to conserving the environment of the Nagara River and ensuring that the Nagaragawa Estuary Barrage achieves its intended purpose, a five-year (1995-2000) survey (monitoring) was conducted to monitor the changing environmental conditions after the barrage went into operation and evaluate the effectiveness of the environmental conservation measures implemented, with the guidance and advice of academic experts. The monitoring included the following:

As a general rule, the survey was conducted openly, with the guidance and advice of the Nagaragawa Estuary Barrage Monitoring Committee consisting of academic experts. The survey results were published in the "Nagaragawa Estuary Barrage Monitoring Yearbook."

The monitoring committee held a total of 12 meetings for deliberations over a period of five years from 1995. Through these deliberations, the committee provided guidance and advice necessary for monitoring planning and barrage operation, including instructions for dissolved oxygen (DO) surveys in the water downstream of the barrage and flushing operations designed for effective water quality improvement, to the Ministry of Construction (now the Ministry of Land, Infrastructure and Transport) and Water Resources Development Public Corporation (now the Incorporated Administrative Agency Japan Water Agency). The monitoring committee was disbanded in March 2000 since the initial purpose of the committee had been accomplished. Before disbanding, the committee made recommendations concerning the direction of monitoring necessary for the time being to continue operating the barrage appropriately.

Since fiscal 2000, monitoring has been carried out according to the recommendations, and deliberations have been carried out by the Barrage Committee newly formed in the Chubu Regional Dam and Estuary Barrage Management Follow-up Committee.

In 2004, ten years after the start of management, monitoring results were compiled in regular reports and presented to the "Barrage Committee" of the Chubu Regional Dam and Estuary Barrage Management Follow-up Committee for deliberations. Deliberations confirmed that the environment was in a stable state without any problems after the start of operation of the estuary barrage.

The "Barrage Committee" was dissolved in 2004. Deliberations have been continued by the Follow-up Committee.

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