danger line meaning in English

警戒线
危险界限危险线
危险线

The water level on the crucial wangjiaba hydrological station may soon surge above the danger line as more rains have been forecast in the next few days , cheng dianlong , deputy director of the office of the flood control and drought relief headquarters , said
防汛抗旱指挥部办公室副主任程淀龙透露:在未来的数天内,还会有更多的降雨,关键的王家坝水文站的水位可能很快就要超过警戒水位