以预防汛期水位上涨导致倒灌为目的建造的工程项目，一般为梯形，是指为了防止河流泛滥而建的堤坝。可以抑制洪水，能保护住在河岸的人每年远离洪灾，免遭财产损失。
防洪大堤通常用来预防洪水。
由于伊利运河逐渐失去生意，有些防洪大堤开始破裂。
As the Erie Canal was losing business, some of its levees began to break.
走到4点过快到防洪大堤了，在一个凉亭补充了食物和水。
At about 4 PM, we were close to the bit mound for preventing flood; we bought food and water at a bower.
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