National Construction Records and Elapsed-years Distribution of Wooden Check Dams in Japan

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  • Akita Hiromi
    Engineering Department II, Osaka Branch Office, Nippon Koei Corporation

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  • 木製治山堰堤の全国施工実績と経過年数分布
  • モクセイ チサン エンテイ ノ ゼンコク セコウ ジッセキ ト ケイカ ネンスウ ブンプ

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To assist in decision-making related to the construction, maintenance, and management wooden check dams, interviews were conducted in all Japanese prefectures to obtain data regarding the construction of such structures in recent years, and to determine their current statuses. We found that in 2013, 1,166 wooden check dams were scheduled for construction across the nation, and that construction records had been set in 42 prefectures. As for construction materials, we found that Japanese cedar was, on the whole, the most popular main building material, accounting for approximately 60% of all such dams, while larch was used in about 20% of the total. It was also determined that the usage rate of antiseptic paint to prevent wood decay was less than 20% until 2009, but began increasing from 2010 and reached about 70% in 2013. Examinations of 358 wooden check dams, including 58 privately owned dams located in a national forest, were conducted, and area-based maintenance management plans were created. These plans included information on antiseptic paint application over an elapsed 10-year period, and were proposed for use as part of a prospective maintenance management index.

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