| Rating | Solver | Clue |
|---|---|---|
| CULVERT | Underground drain | |
| SEWER | Underground Drain | |
| UNDERDRAIN | An underground drain or trench with openings through which the water may percolate from the soil or ground above. | |
| UNDERDITCH | To dig an underground ditches in, so as to drain the surface; to underdrain; as, to underditch a field or a farm. |