The life of your French drainage system may be temporary because of a tendency for the shingle and stone to get clogged up with earth.

Clay drainage system | Hepworth Clay - Wavin

Depending on what size pipe you go for, the number of perforations and where they are positioned on the pipe may vary. The pipe should be surrounded by gravel in a trench where water moves through the ground, passes through the gaps in the gravel, and starts to fill the trench surrounding the pipe. As this happens the water will percolate into the pipe through the holes and flow out of the pipe when its installed with a fall. Perforated pipes can be PVC, cement, clay, and iron. The most popular ones are PVC pipes, which are lightweight and flexible.Perforated land drain is also useful as field drainage, in sport fields, and as lawn & garden drainage in smaller diameters, and can also feature in french drains to improve drainage. Contrary to popular opinion, the most effective method is to have the holes facing down. Why do the perforations go downwards? Perforated pipes are installed to collect excess water from the soil and drain it directly down to the roots of plants or crops—this helps to keep the irrigation land healthy without flooding the field.

150mm Perforated Twinwall Drainage Pipe (6m) - JDP 150mm Perforated Twinwall Drainage Pipe (6m) - JDP

Perforated pipes are also used for waterproofing basements. They are installed as a buffer pipe around the foundation to prevent leakage into basements and water damage. 2. Perforated Pipes for Public Spaces

When Can I Use a French Drain?

Perforated Pipes and Landscapes: A well designed garden landscape can transform your outdoor space, but it is important to protect your garden from changing weather conditions. Using perforated pipes discreetly in your garden landscape can help to absorb excessive rainwater, draining it away from your garden and property. By installing perforated pipes under the ground, excess water can be drained away so that your garden landscape is not at risk of damage. Perforated pipes comply with the Department of Transport Specification for Highway Works, which states the total area of drainage holes should not be less than 1000mm2 per metre length of pipe.