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An Expert Guide to Landdrain Installation
Even though heavy rain is quite common here in the UK, there's a significant difference between slightly damp land after a shower and land that's completely waterlogged. Waterlogged land can cause serious problems for building foundations, nearby structures, landscaped areas, and gardens. This condition is typically caused by excessive rainfall, clay-rich soil, or proximity to large bodies of water. Addressing waterlogging early is crucial, as prevention is always far more cost-effective than dealing with the consequences later. Installing land drains is often a wise investment, especially in areas prone to these issues.
Land drains, also known as perforated drain pipes, are widely used in both commercial and residential settings to redirect surface water away from buildings, preventing flooding and protecting fields, gardens, and properties. These pipes are relatively simple and affordable to install, but they can save substantial costs down the road. In this guide, we’ll provide useful information and advice for anyone looking to set up a land drainage system as part of a commercial construction or DIY home project.
Key Takeaways:
- Land drains, or perforated drain pipes, help move surface water away from buildings to avoid flooding and property damage.
- Land drains consist of perforated pipes buried in trenches and covered with aggregate like gravel or crushed stone, allowing water to flow toward a designated disposal point.
- Land drain pipes are typically made from high-density polyethylene (rHDPE) and come in various lengths and diameters, ranging from 60 to 160mm, suited for different scenarios.
- There are two main types of land drain pipe: coils and twinwall drains. Twinwall drains are sturdier and better suited for areas where the pipe might bear significant weight.
Land drainage systems work by channeling surface water into trenches filled with perforated pipes. These pipes are surrounded by aggregate layers to filter debris and allow water to flow into the pipes through perforations. The pipes are installed at a gentle slope (typically around 1 in 150 or 0.666%) to ensure water flows smoothly toward a disposal point, such as a storm drain, soakaway system, or natural water source like a river or stream. This method is often referred to as a French drainage system, named not after the country but after an American judge and farmer who popularized the technique in his 1859 book on agricultural drainage.
Land drain pipes are manufactured from high-density polyethylene due to their durability and resistance to water erosion. Available in lengths from 25m to 50m and diameters ranging from 60mm to 160mm, they cater to diverse needs. Two primary types of land drain pipes exist: coils and twinwall drains. Twinwall pipes, with their reinforced structure, are ideal for areas where the pipe might endure significant pressure or weight above it.
When choosing land drain pipes, ensure they are kitemarked to BS4962:1989, meaning they meet UK standards for safety and performance. Although drainage pipes are usually black, some may come in yellow, but their color is irrelevant since they serve only one purpose—redirecting water.
Installing a land drainage system involves several critical steps:
- **Consult Authorities:** Before starting, confirm with local authorities that the intended disposal point for collected water is permissible. Storm drains are often under municipal control, and exceeding their capacity can result in fines and flooding. Additionally, if you plan to direct water to a nearby watercourse, you might need approval from the Environment Agency.
- **Prevent Sediment Buildup:** To avoid blockages caused by sediment accumulation, consider using a catch-pit or silt trap. Alternatively, install a non-woven geotextile approximately 10cm above the land drain to filter out debris.
- **Choose the Right Gradient:** Ensure the pipes are installed at a gentle slope of around 1 in 150 to facilitate smooth water flow. A steeper gradient might cause water to flow too quickly, potentially leading to flooding.
- **Select the Proper Soakaway Crate:** If you're using a soakaway crate system as the disposal point, choose crates with the appropriate load rating to support any traffic overhead.
- **Maximize Efficiency:** For smaller areas, place the land drain within 2.5 meters of the waterlogged region, ideally in a herringbone pattern with side branches connected to a central spine via Y junctions. For larger areas, the distance can extend up to 10 meters.
At EasyMerchant, we offer a wide selection of land drainage products from leading manufacturers. Our fast delivery service ensures you receive your order promptly. If you have any questions or need assistance finding specific items, feel free to contact us.
Shop Land Drain:
*Enviroflow Drainage Plank*
*Land Drain End Cap*
*100mm Type 8 Filter Drain*
*110mm 3m Perforated Sewer Pipe*
*Land Drain Multi Junction*
*Land Drain Coupler*
*Land Drainage Pipe Coils – Black*
These products are designed to ensure efficient water management and long-term durability, making them essential for maintaining healthy landscapes and secure structures.