An Underground Drainage system is used to discharge surface, foul, and grey water. Surface water refers to rainwater and stormwater where foul water is the water discharged from toilets and grey water is the waste from baths, sinks, washing machines and dishwashers.

drainge bristol

Emergency Drainage Cost Explained

Our promise is to always be fair honest and open on pricing. Drainage can vary based on the scale of the property size, condition, and location it would be unfair of us to mislead you with an ambiguous price. Therefore, we carry out a full on-site inspection before giving you our best price.


How does Drainage work?

How does the Drainage System work?

Underground Drainage is simple when you know how it all works. Wastewater is discharged from the sanitary appliances that you have in your home, so anything from the toilet and bath, where it will eventually transfer through large vertical pipes. It is through these pipes that the wastewater will reach the main Underground Drainage System.

Depending on the age of your property, the number of Underground Drainage Pipes will vary. Modern homes tend to have one pipe which is called a Soil Stack, whilst older homes have separate pipes to separate soil and wastewater.

Where does the water go?

The water that is discharged can go in one of two directions, it either:

  • Runs straight into the main sewer, cesspit, or septic tanks.

  • Flows to the main drainage stack which leads directly into the underground drain or trapped gorge.

If the latter, a metal or plastic grid or gorge is fitted to the drain to prevent the build-up of debris. The grid drops the chances of the Underground Drainage Pipes becoming blocked with leaves and other debris.

What about Rainwater Drainage?

A heavy downpour is likely to overwhelm the system- hence why water from channels is drained separately. Downpipes are often used to discharge rainwater over a grid or open gorge that is connected to an underground drain.

After this, water can either run into a storm drain that is installed beneath the road or it can be piped into a soakaway in your garden to infiltrate back into the soil.

Who is held responsible for the Underground Drainage system?

Put simply, you are liable for your Underground Drainage. As the homeowner, Underground Drainage Pipes are your responsibility, until they reach the main sewer, therefore, you will need to fix any blockages or damages that occur, at your own expense!

Modifications of the system come under the stringent Building Regulations which are enforced by the local council and not the water company. If you are thinking of changing your Underground Drainage System, you need to make sure that they meet the Building Regulations, so be sure to discuss your requirements in detail with the building control officer.

Choosing Supplies from South West Plumbers

Here at Southwest Plumbers, we have an extensive range of drainpipes available, including the popular 110mm drainage pipes and the 160mm drainage pipes. Although we specialise in supplying drainage pipes, we also supply a wide range of pipe fixtures and drainage gullies and gorge traps, making us your one-stop shop for your Underground Drainage supplies!

Our UPVC pipes and pipe fixtures for Underground Drainage systems are made to meet EN1401 standards and are suitable for various land and surface water drainage applications.

Emergency Plumber

Whether you are looking to service your boiler, replace your boiler or move from ‘oil to gas’ it is essential to find the right heating engineer to undertake any work. A professional heating engineer will provide you with all the information and advice you need to consider your options. They will supply quotes and provide peace of mind that all work is carried out to proper standards.

It is essential you use a Gas Safe registered engineer to install, service or check gas appliances including boilers. To carry out work on gas installations and appliances safely and legally, gas engineers must be on the Gas Safe Register.

Call 01173 698 067

Plumbers Near Me

A number of our key locations are listed below, but if you're unsure from our locations map whether we can send an engineer to your home, please contact our customer service team on 01225 240 230.

Southwest Plumbers Emergency Key locations

Find us on social media

contact us