水すい位い標ひょう

noun

water level gauge; watermark

Refers to a physical marker or gauge that shows water level, such as on a riverbank, reservoir, or in a boiler. The English 'watermark' here means a mark indicating water level, not a digital watermark.

• 川かわ岸ぎしの水すい位い標ひょうを見みると、昨日きのうより水すい位いが上あがっていた。

  Looking at the water level gauge on the riverbank, the water level was higher than yesterday.

• ダムの水すい位い標ひょうは、貯ちょ水すい量りょうを監かん視しするために設せっ置ちされている。

  The water level gauge at the dam is installed to monitor the water storage.