人が制御するナイアガラの滝
夜間の水量は日中の半分に調節されている。観光のオフシーズンになる冬の期間も水量が抑えられている。浸食が続けばエリー湖に埋没してしまうため、一世紀にかけて技術者の手により人工的に浸食が抑えられてきた。今もなお浸食のスピードは年間3cm程度に抑えられている。2万5千年後には消滅するという
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