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Outline of the Nagaragawa Estuary Barrage

General View of Nagaragawa Estuary Barrage Facilities

[Site]
The left bank : Tokadomo, Nagashima-cho, Kuwana City, Mie Prefecture
The right bank : Fukushima, Kuwana City, Mie Prefecture

Fiscal 1960 Preliminary survey started.
Fiscal 1963 Survey by KST (the Estuary Resource Survey Team for the Three Kiso Rivers) (A67)
Fiscal 1968 Review of project implementation plan started.
Oct. 1968 Basic plan decided.
Fiscal 1971 Construction began.
Dec. 1971 Policy on implementation announced.
Mar. 1973 Basic plan (partial amendment)
July. 1973 Implementation plan approved.
Dec. 1973 Action demanding suspension of construction filed (old suit).
Sept. 1976 Bank collapse at Anpachi-machi, Gifu Pref.
May 1981 Action demanding suspension of construction abandoned (old suit).
Apr. 1982 Action demanding suspension of construction filed (new suit).
Feb. 1988 All fishermen's cooperative associations agreed on the start of work.
Mar. 1988 Construction of the main structure of barrage began.
Dec. 1988 Change of policy toward implementation indicated.
Feb. 1989 Change of policy toward implementation approved.
Mar. 1992 Additional survey report published.
Apr. 1992 Technical report published.
Mar. 1993 Basic plan (total change)
Apr. 1994 Nagaragawa Estuary Barrage survey conducted (Mar. 1995).
July 1994 Intermediate appeal filed on the case of suspension of construction (Nagoya High Court).
Mar.-Apr. 1994 Round table conference held (8 sessions).
Mar. 1995 Change of implementation plan approved. Facility management policy indicated. Facility management regulations approved. Survey report submitted to Construction Minister Nosaka.
Apr. 1995 Management started.
Apr. 1995 Monitoring of Nagaragawa Estuary Barrage conducted (March 2001).
May 1995 Construction Minister Nosaka: "Full-scale operation from May 23." Note: Basic plan = The Basic Plan for Water Resource Development in the Kiso River Water System
July 6, 1995 All gates brought into operation.
July 1997 Dredging in the mound section completed.
Apr. 1998 Diversion of water to Nagara aqueduct started; Diversion to Chusei water supply system started.
Dec. 1998 Court-of-appeal decision on action demanding suspension of construction (Nagoya High Court).
Sept. 1999 5900 m3/s of discharge observed during Typhoon No. 16.
Apr. 2000 Transition to follow-up survey
Oct. 2004 8000 m3/sec of discharge, highest since the start of full-scale operation, were observed due to the effects of Typhoon No. 23.

Note : Basic plan: Basic Plan for Water Resource Development in the Kiso River Water System