ミシガン州のダム洪水、米国の老朽化インフラのリスク浮き彫りに

先月、記録的な洪水によりミシガン州北部の複数のダムが決壊の危機に直面し、ある都市では主要な防壁から水が溢れそうになる事態となった。この出来事を機に、気候変動による嵐の激甚化が進む中、国内の老朽化したダムへの対策を求める声が再燃している。

先月、ミシガン州北部全域で洪水が発生し、河川は記録的な水位に達した。4月16日、シボイガン・ダムでは水位がダムの頂上まであと5インチに迫り、当局は避難を検討する事態となった。ベレアでは、作業員が築100年の構造物周辺に約1,000個の土嚢を積み、溢水を防ぐための措置を講じた。

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