high water
= high tide. ,high-water mark
1 mark showing the highest level reached by the sea or by flood waters 高水位线(标明海水或洪水所达到的最高水位).
2 (fig 比喻) highest point of achievement 成就的顶点.
Yes, I see. How can they get rid of waste water in this way? What a terrible colour the sea is now! It looks as if our class won't be able to bathe at all.