A channel drain is a linear drainage system that collects water along a channel rather than at a single point. In bathrooms, the term usually refers to a linear shower drain; in external and commercial applications, it refers to a heavier-duty trench drain set into paving or concrete.
The two main types
| Type | Application | Construction |
|---|---|---|
| Bathroom linear drain | Showers, wet rooms | Stainless steel channel, removable grate or tile insert, 200–1200 mm typical |
| External / trench drain | Driveways, pool surrounds, commercial floors | Polymer concrete or HDPE channel with heavy-duty grate, load-rated |
What matters in a bathroom channel drain
- Flow rate — must exceed the shower output, particularly with rain heads
- Channel depth — determines the required floor build-up
- Outlet position — horizontal, vertical or side, matched to pipework
- Sealing flange — for continuous waterproofing at the channel body
- Grate access — removable for hair removal and cleaning
What matters in an external channel drain
- Load class — pedestrian, vehicle or heavy vehicle rating
- Grate material — stainless steel, galvanised or composite
- Removable or fixed — cleaning access versus debris retention
- Fall and outlet capacity — matched to rainfall and catchment area
For bathroom projects, see our linear shower drain range.