Linear Drainage Channels for Driveways: When You Actually Need One

Updated 15/09/2026 · 4 min read

A linear drainage channel - often referred to generically as an "ACO drain" after one well-known manufacturer - is a common feature on modern driveways, and understanding what it's actually for helps you judge whether a quote that includes or omits one makes sense for your property.

What a linear drainage channel does

Rather than relying entirely on a driveway's surface fall and permeability to shed water, a channel drain sits at a specific point - typically at the bottom of a slope, across a garage entrance, or along the boundary where a driveway meets the road - and collects water into a connected pipe system, directing it to a soakaway or approved discharge point.

When one is genuinely needed

• Sloped driveways, where water naturally accelerates towards the bottom and can overwhelm a permeable surface's capacity to absorb it locally
• Garage or building entrances, where water needs to be intercepted before it can run into the building itself
• Where a driveway meets the public highway, since directing water onto the road or pavement is generally not permitted and can cause its own drainage and safety issues

When it's more of an upsell than a necessity

On a flat, genuinely permeable driveway with good sub-base drainage and no slope towards the house or the road, a channel drain adds cost without addressing a real problem. Ask a contractor recommending one to explain specifically what water flow issue it's solving for your property, rather than accepting it as a standard inclusion.

How it fits with permeable paving and SuDS

A channel drain and a genuinely permeable surface aren't alternatives to each other - they solve different problems, and a well-designed driveway often uses both: a permeable surface to handle general rainfall, with a channel drain specifically at pinch points like a sloped section or an entrance (see our SuDS and soakaway guide for how these pieces fit together).

Maintenance

Channel drains need periodic clearing - leaves and debris collect in the grating and channel itself, and a blocked channel drain stops working exactly when it's needed most, during heavy rain. Include checking it in your general driveway maintenance routine (see our maintenance guide).