tumblr via “quote-over100notes-jp: “建設当時フルボッコにされた長良川河口堰ですが、なかったら海水が遡上するので下流域の浚渫ができず、中流域からの勾配が稼げずに流れが遅いままで、今回の豪雨で…” https://t.co/qRDhNxfIOs



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August 17, 2018 at 03:52PM
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