平成16年（2004年）新潟県中越地震による信濃川左岸地区の水理機能被害および施設復旧に関する調査

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タイトル別名
  • Field Observations on Hydraulic Damages by the Mid Niigata Prefecture Earthquake in 2004 and Disaster Rehabilitations in Shinanogawa-sagan Irrigation Project
  • ヘイセイ 16ネン 2004ネン ニイガタケン チュウエツ ジシン ニ ヨル シナノガワ サガン チク ノ スイリ キノウ ヒガイ オヨビ シセツ フッキュウ ニ カンスル チョウサ

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説明

A sequence of powerful earthquakes which hypocenter of the mainshock is magnitude of 6.8 at 5:56 pm on October 23, 2004 struck Mid Niigata prefecture. Department of Hydraulic Engineering (NIRE) investigated hydraulic damages and disaster rehabilitations of Shinanogawa-sagan National Irrigation Project where is located apart due west from the epicenter by 10km. The three times observations were performed in actual sites. The results of field observations on damages and disaster rehabilitations of large-scale irrigation and drainage facilities, pipeline distribution systems and paddy fields are reported. 1.97 billions yen as total economical damages on irrigation and drainage facilities including pipelines, farmland and farm roads are estimated in Shinanogawa-sagan land improvement district. Major economical damages consist of the drainage canals (0.64 billions yen), main canals (0.51 billions yen) and farmlands (0.47 billions yen). Temporary intake of irrigation water from Ojiya headwork to the rehabilitated main canals have started on Dec. 2004. Buried pipeline in farm lands have been repaired up to 2005 next irrigation season due to the effort of land improvement district and farmer groups. In some area, insect pest to rice have occurred by influence of the one month water supply lag. It is recognized that the reliability of irrigation water supply is essential in rice cultivation.

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