決堤
決堤又稱決口,是指堤坝因洪水衝擊而被破坏,导致洪水淹没堤坝后面的土地。當然堤坝如果品質不過關,本身就有漏洞則更容易坍塌。決口出現後要第一時間修復,否則洪水或河水很有可能因此改道。[1]
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1953年北海大洪水期间的堤坝決口
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