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Land Drainage is the term given to perforated drainage pipes that are used to heal waterlogged areas in gardens or other landscaped areas such as sports fields. Essentially they are pipes that allow water to enter through perforations. The water then flows away to a disposal point such as a soakaway, a storm drain or a stream. You should always check to confirm that your chosen point of outfall is permissible. Land Drains should never be attached without the express permission of the Local Authority to a drain, and in these circumstances the connection must incorporate a trap.
TYPES OF LAND DRAIN
Most land drains today come in the kind of flexible coils made from PVC. The diameter of these pipes varies from 60mm to 150mm, although 80mm and 100mm are the most popular sizes for applications. Coil lengths are 25m or 50m, although 100m coils can be found in a few of the sizes. Where is a need for strength in the pipe, a rigid perforated Twinwall pipe ought to be used rather than the flexible coiled alternative. Examples of this would be where the pipe is buried down and thus the backfill material over the pipe is particularly heavy or in instances such as under a driveway.
Unlike underground ducting where colour is an indicator of what’s inside the duct, colour is irrelevant when it comes to land drains.
HOW LAND DRAINS WORK
In waterlogged areas, closely packed soil particles hold the water in position — there’s no escape route for the water. By replacing the majority of these soil particles a clear path for the water is generated, as the gap between each piece of shingle is greater than the gaps between the soil particles. Gravity takes the water then picks up speed, channelling downwards and to the land drain itself via the perforations in the pipe. Once inside the pipe, which can be placed in a gentle gradient, the water is then free to flow away unhindered into the point of disposal.