| OUTFALL | Place where a drain or pipe empties |
| SEWER | A drain or pipe, especially underground, used to carry away surface water or waste matter (5) |
| CLOG | Obstruct drain or pipe |
| SPILL | To destroy or waste; a slop of upset milk e.g.; a stick or twist of wood or paper for lighting a candle, fire or pipe; or, a tumble from a bike or a horse (5) |
| CULVERTS | Arched channels enclosing a drain or watercourse under a road or railway (8) |
| CORMORANT | A drain or covered channel that crosses under a road or railway (7) |
| CULVERT | A drain or covered channel that crosses under a road or railway (7) |
| GULLY | A ravine or valley cut by rainwater; a channel at the side of a tenpin bowling lane; a gutter or storm drain; or, a fielding position in cricket (5) |
| SCUPPER | A drain or spout allowing water on the deck of a vessel to flow overboard (7) |
| SLUICE | A drain or channel for water (6) |
| STOPPER | A bung, cork, plug or spigot for sealing a bottle, decanter, duct or pipe; or, a person/thing that halts a crime, goal, show or other process (7) |
| SEWERS | Drains or pipes, especially underground, used to carry away surface water or waste matter (6) |
| RAINDROPS | Source of water? Burst drains or pipes initially (9) |
| MAIN | From the Old English for "strength", a word for power or force; the chief part; a principal cable, duct or pipe; or, the high sea or open ocean (4) |
| SAP | Drain or trench used in siege |
| DEWATER | Drain or desiccate |
| REPUMP | To drain or force out again (6) |
| FUNNEL | A narrow tube or pipe widening at the top for pouring liquid, powder, etc. into a small opening |
| FLUE | A shaft, tube or pipe, especially as used in a chimney to carry off smoke, gas, etc (4) |
| OVERFLOW | Spillage; an outlet or pipe for spare water; or, any excess or inundation (8) |
