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：2025/11/29
100-year flood
（ plural ）
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A flood event that has a 1% probability of occurring in any given year; an exceptionally large flood.
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100-year flood
The town's emergency plan was revised after engineers modeled the impact of a 100-year flood on the levee system.
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The town's emergency plan was revised after engineers modeled the impact of a 100-year flood on the levee system.
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