| Rating | Solver | Clue |
|---|---|---|
| TANK | Water storage structure | |
| RESERVOIR | Water storage | |
| DAM | Water storage | |
| CISTERNS | Water storage tanks | |
| SILO | Grain storage structure | |
| ELEVATOR | Grain storage structure | |
| STALACTITE | A tapering structure formed by dripping water | |
| STALAGMITE | A tapering structure formed by dripping water | |
| CONDUIT | A structure forming a reservoir for water. | |