東京の地下に「もう一つの川」構想 豪雨対策は「ためる」から「海へ流す」へ ハザードマップで「安全な避難路」確認を Yahoo!ニュース. Local authorities and relevant stakeholders are closely monitoring the situation as fresh developments unfold on the ground. Officials noted that further verified updates and administrative measures will be shared following a detailed review.