Underground Drainage

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Underground drainage refers to a system of pipes and components installed beneath the ground surface to transport wastewater, such as foul drainage or excess rainwater, to appropriate disposal or treatment facilities. It is designed to efficiently collect and channel these flows, preventing surface flooding and maintaining proper sanitation.

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110mm Slip Coupler

What is Underground Drainage?

Underground drainage refers to the comprehensive network of subterranean pipes and associated components, designed to facilitate the transportation of wastewater or rainwater runoff to designated sewage treatment facilities or, in the case of rainwater, to appropriate soakaways or natural water courses.

We stock a host of underground drainage supplies to accommodate a range of underground drainage systems.

The underground drainage products we stock include underground pipes, underground coupling double sockets, degree bend sockets and so much more.

Degree Bend Double Sockets

Degree bend double sockets are a vital component in drainage systems, especially when navigating around corners and obstacles. 


These fittings allow for smooth directional changes, ensuring the efficient flow of water. 


Available in various angles, they provide flexibility during installation and help maintain the integrity of the drainage network.

Bottle Gully and Grid

Bottle gullies are designed to collect surface water and connect it to the underground drainage system. 


They consist of a chamber that holds water, preventing odours and gases from escaping. The grid on top prevents debris from entering the drainage system while allowing water to pass through. 

Bottle gullies are often installed in areas prone to surface water accumulation, such as driveways and patios.

Underground Pipe

Underground pipes are the backbone of any drainage system, responsible for transporting water away from the building's foundation. 


Available in various materials like PVC or HDPE, these pipes are durable and resistant to corrosion. 


They can be solid or perforated, allowing for different drainage applications. Perforated pipes are commonly used in French drains or soakaways to facilitate the controlled dispersal of water into the ground.

Install Underground Drainage

The installation process for underground drainage typically involves the following steps:

  1. Planning and Design: A thorough assessment of the site is conducted to determine the drainage needs, including the identification of the appropriate pipe size, gradient, and layout. A detailed plan is created to guide the installation process.

  2. Excavation: Trenches are dug along the designated path of the drainage system, ensuring they have the correct depth and width to accommodate the pipes and fittings. Proper safety measures are implemented during excavation.

  3. Bedding Preparation: A layer of granular material, such as sand or pea shingle, is placed at the bottom of the trench to provide a stable and even foundation for the pipes. This bedding material helps distribute loads and reduces the risk of damage.

  4. Pipe Installation: The pipes and fittings are carefully positioned within the trench according to the planned layout. Connections between pipes are made using appropriate sealing techniques, such as solvent welding or rubber seals, to ensure watertight joints.

  5. Slope and Alignment: The pipes are laid with the correct gradient to allow for proper flow of wastewater or rainwater. This ensures that the drainage system operates efficiently and prevents the accumulation of stagnant water.

  6. Backfilling: Once the pipes are in place and aligned correctly, the trenches are backfilled with suitable material, such as granular fill or compacted soil, taking care to avoid damaging or displacing the pipes. Backfilling is done in layers, with each layer compacted to provide stability.

  7. Inspection and Testing: The installed drainage system is inspected to verify the proper alignment, connections, and overall integrity. Various tests, such as water testing or smoke testing, may be conducted to identify any leaks or defects that require rectification.

  8. Covering and Restoration: The excavated area is restored by replacing the topsoil and any disrupted surfaces. Landscaping or paving materials are reinstated, ensuring that the surrounding area appears aesthetically pleasing and functional.


It is crucial to adhere to local building codes, regulations, and guidelines during the installation process to ensure a safe and effective underground drainage system. 

It is recommended to consult with professionals or contractors experienced in drainage installations for assistance and compliance with relevant standards.


Frequently Asked Underground Drainage Questions

What Are Some Common Types of Drainage Systems?

Common types of drainage systems include French drains, where a perforated pipe is surrounded by gravel to facilitate water absorption, and surface drainage systems that utilise trench drains or permeable pavers to direct water runoff away from the building. 


Additionally, underground pipes are used to transport water away from the building's foundation.

How Can Drainage Systems Be Integrated Into Building Design?

Drainage systems can be integrated into building design through careful planning and consideration. 


Architects and engineers work together to determine the optimal placement of drainage components, such as catch basins, underground pipes, and drainage outlets. 


This integration ensures that water is effectively managed while minimising any visual impact on the building's aesthetics.

What Are The Key Components of a Drainage System? 

The key components of a drainage system include products such as an underground drainage pipe, fittings (such as degree bend double sockets), catch basins, drainage fabric, bottle gullies and grids, and other specialised materials. These components work together to collect, channel, and transport water away from the building, preventing water accumulation and potential damage.

What Are Sewer Pipes?

Sewer pipes are the backbone of an underground drainage system, responsible for transporting wastewater away from buildings to a sewage treatment facility.


A sewer pipe is designed to be robust, durable, and resistant to the corrosive effects of wastewater. PVC-U sewer pipes, in particular, offer numerous advantages due to their excellent chemical resistance, longevity, and ease of installation.


PVC-U pipes are available in various sizes and are fully compatible with other components of the drainage system.


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