www.mlit.go.jp/mizukokudo/sabo/dosekiryuu_taisaku.html

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砂防：土石流とその対策 - 国土交通省

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https://www.mlit.go.jp/mizukokudo/sabo/dosekiryuu_taisaku.html

About this page

This page presents information about debris flows and countermeasures by Japan's Ministry of Land, Infrastructure, Transport and Tourism. Debris flows occur when stones and sediment from mountainsides and riverbeds are swept downstream at speeds of 20-40 km/h during heavy rainfall, causing devastating damage to homes and farmland. Countermeasures include constructing sabo dams (sediment control dams) in upper streams to reduce sediment production and discharge, and at valley outlets to directly intercept debris flows. Successful examples include the Namikawa No.1 Sabo Dam and Aratani River Sabo Dam, which mitigated damage from heavy rainfall.