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The embankment prevents the water from going over the edge. It's an embankment.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
水が堤防を越えそうになっているから、近づかない方がいいですよ。
The water is almost running over the embankment, so you should be careful.
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