| Answer | Crossword Clue |
|---|---|
| RING | Water level indicator |
| HEATINDEX | Discomfort level indicator |
| GCLEF | Indicator of high-level staff? |
| TIDEGAGE | Water-level measure |
| TIDE | Water level variation |
| DIKE | Water-level regulator |
| LEVEE | Water-level regulator |
| SEEKS | "Water ... its own level." |
| NEAPTIDE | High, but not highest, water level. |
| SCUPPERS | Openings at the level of the deck for draining water overboard. |
