Position and Role of Agricultural Land in the New Policy of Integrated Watershed Flood Management of Japan

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  • 流域治水における農地の位置と役割
  • リュウイキ チスイ ニ オケル ノウチ ノ イチ ト ヤクワリ

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Abstract

<p>　After experiencing devastating flood damage in major river basins in consecutive years, the Japanese government launched a new flood management policy of basin-wide flood control in 2020: “ryuiki chisui.” For this policy, the Ministry of Land, Infrastructure, Transport and Tourism requests collaboration among all stakeholders in different sectors to reduce flood magnitude and social vulnerability to flooding, together with traditional river training work. The author analyzed the background of this historic policy change, demonstrating that basin development, including the expansion of urban areas and the drainage improvement for agricultural land, impose overly large burdens on river training. To resolve this difficulty, farmland areas in the basin, especially paddy fields (“suiden”), must play an essential role in flood control, reducing flood peaks using drainage facilities and receiving flood excess from rivers in dangerous circumstances. That might be technically possible with minimum damage to farming. However, because the agricultural sector might not readily accept such a new role, the community has no alternative but to ask the farming sector for support with gratitude. Acceptance of the policy might then represent a rational policy alternative for the sector.</p>

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