A properly installed land drainage system is the ideal solution for areas of grass that tend to become waterlogged, regardless of whether they are in a domestic, commercial, industrial, or agricultural setting. This issue can be especially prevalent in the UK, given the frequent rainfall throughout the year, even during the summer months. Areas with dense, clay-rich soil or those situated near large bodies of water are particularly vulnerable. Unfortunately, waterlogging can be both time-consuming and costly to address, as it can severely damage landscaping, gardens, plants, and even building foundations. However, with a well-designed land drainage system, these issues can be avoided entirely. Besides being an efficient way to prevent flooding, standing water, and property damage, land drainage systems are cost-effective and relatively straightforward to install.
There are several approaches to consider when installing a land drainage system, and the classic herringbone design remains a popular choice. This is due to its various advantages, which we’ll discuss here, along with a brief overview of alternative land drainage solutions. We’ll also provide practical tips on how to install a reliable herringbone drainage system.
Key Takeaways:
- Land drainage systems help prevent waterlogging and flooding in grassy areas.
- Land drains consist of perforated PVC pipes installed in trenches, covered with aggregate, allowing excess rainwater to flow into the pipes and toward designated disposal points.
- Common drainage system layouts include the herringbone, linear, cross-drain, and sump-and-pump systems.
How Land Drains Work:
Land drains are perforated PVC pipes installed in trenches across areas prone to water collection. When secured with a suitable aggregate base and cover layer, excess rainwater can seep into the pipes through perforations, flowing toward specified disposal points like storm drains, soakaway crates, or natural water sources such as rivers or lakes. Since the 19th century, land drains have been a trusted method of water removal, sometimes called the French drainage system after American farmer Henry Flagg French, who popularized it. Back then, roofing tiles were used, but today's PVC pipes are strong, durable, and available in various lengths and diameters. Depending on the application, either flexible land drain coils or stronger twin-wall land drains are used, the latter being ideal for high-traffic areas like highways or railways.
Drainage System Options:
Though all drainage systems operate similarly, different layouts suit different areas. Here are the top four commonly used designs:
Herringbone System:
The herringbone system features a central pipe on a downward slope with lateral pipes connected at slight angles. This layout resembles a herringfish skeleton, making it efficient for larger areas like sports fields or golf greens. It ensures even drainage across irregularly shaped lawns by placing lateral pipes no more than 2.5 meters apart from the main pipe.
Grid System:
Also known as gridiron or parallel drainage, this system uses a main pipe along the perimeter with lateral pipes crossing at right or acute angles. Best suited for geometrically uniform areas like football pitches or bowling greens, it’s easier to install and can incorporate sand or gravel slits for enhanced water removal.
Fan System:
Used in small gardens or irregularly shaped lawns, the fan system spreads lateral pipes evenly and connects them directly to an outlet. It’s less common for large areas like golf greens, where the herringbone pattern is more practical.
Natural System:
Sometimes called contour or random drainage, this system follows the natural contours of the ground, mimicking the land's curves. Ideal for maintained grasslands like sports grounds or suburban greens.
Pros and Cons of the Herringbone Pattern:
The herringbone pattern is more expensive due to its extensive piping requirements but remains popular because it doesn’t require as deep trenches as other systems, saving time. Its efficiency ensures better coverage across the area. However, it can be more challenging to install than other methods, though careful planning can mitigate this.
Installation Advice:
Regardless of the pattern, land drainage installation involves similar steps. Required items include perforated land drainage pipes, geotextile membrane, gravel, and appropriate tools. Installation typically follows six key stages:
Planning and Preparation:
Create a visual plan before starting to ensure enough pipes and accurate trench placement. Check with local authorities regarding disposal points and permissions if redirecting water.
Trench Digging:
Ensure trenches accommodate aggregate layers, allowing for at least 15cm of gravel on each side, a total cover depth of 45cm, and a 10cm gravel base. Deeper trenches may require shoring.
Laying Geotextile:
Install non-woven geotextile membrane to protect against sediment buildup, ensuring water flow while blocking debris.
Laying Drains:
Place pipes at a 1:150 gradient for steady water flow. Cut pipes between corrugations and avoid reversing perforation direction.
Adding in Backfill:
Fill trenches with at least 30cm of gravel, leaving 15cm from the surface.
Covering Land Drains:
Top with geotextile and fill trenches with 10-15cm of topsoil and grass.
Drainage Planks:
A new option, Enviroflow drainage planks, are easy to install and never clog. They're ideal for smaller projects and maintain grass appearance without drying marks.
Specialist Drainage Products:
For long-lasting solutions, use commercial-grade products like those offered by EasyMerchant. Their land drainage pipes and geotextile membranes are durable, flexible, and easy to install. Other products like channel drains prevent water pooling in patios or gardens.
At EasyMerchant, we stock high-quality products from leading manufacturers, many featuring the British Kitemark. With fast delivery and expert customer service, we’re here to assist with your drainage needs.
In conclusion, a well-planned land drainage system is essential for maintaining healthy landscapes and preventing costly water damage. Whether you choose the herringbone or another layout, proper installation ensures efficient water management and long-term benefits.
SHOWER TRAY
Shower Tray,sauna and steam bath,Shower Trays,portable steam bath,steam room spa
Guangzhou Aijingsi Sanitary Products Co.,Ltd , https://www.infinityedgehottub.com