Driveway and patio drainage

Summary: Learn how to construct driveway drainage, patio drainage, a drainage system, build a driveway and patio drainage system and build a channel.

For larger patios or driveways, there may be a need for a drainage system, particularly if there is a natural slope towards the building. The ideal drain would be a linear drainage system, which consists of a U-section channel bedded in concrete and running into an existing drain or soakaway.

It is important to consider the drainage system at the same time as you plan the patio or driveway. The drainage channel should be positioned at the lowest part of the patio or driveway and have a fall of 1:40.

If the drainage channel runs into a soakaway it must be at least 3m (9ft 9in) away from the building.

When laying the patio or driveway you will leave narrow gaps for the channel in accordance with yours plan. The gap will be approximately the diameter of a drainpipe or length of guttering 100mm (4in).