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Subsoil Drainage

A subsoil drain is a drainage system that is installed to remove excess water from the surrounding soil around homes, garages, retaining walls and basements.

INSIGHTS: SUBSOIL DRAINAGE

What are some common problems arising from poor subsoil drainage?

Your Pro Plumber has plenty of experience improving a property’s subsoil drainage. We’ve likely experienced (and fixed) any issues you might have. Common problems we see are:

  • Water leaking through retaining walls
  • Water leaking into basements
  • Wet and muddy lawns
  • Water pooling on the ground when it rains

If you’re experiencing any of these problems in your home, contact Pro Plumber for a free quote to get it fixed in no time. Scroll down and read through a bunch of helpful tips and insights and some of the issues you might experience.

Subsoil drainage basics

A subsoil drain is a drainage system that is installed to remove excess water from the surrounding soil around homes, garages, retaining walls and basements.

The perforated or slotted pipes are placed underground and are usually covered by geotextile material to stop soil from entering it. Ground water enters the pipe works and is taken away into the stormwater network servicing your property.

What are the benefits of subsoil drainage?

Having these types of water controlling drainage systems installed in your home is common practice. There are many exceptional benefits that come with subsoil drains:

  • Excess water entering the landscape/ building is decreased extremely
  • The amount of salinity (salt) present in the soil is lessened
  • The soil is overall strengthened allowing it to be healthier
  • Aeration of the soil is increased, meaning healthier plants and grass overall
  • Mixed with fertiliser, when the soil is drained of excess water, your garden will produce higher quality fruit, vegetables, flowers and plants
  • Structural damage to the home is drastically decreased, specifically walls and landscaping, as water doesn’t enter their range
  • The stability of the ground is also improved, helping with the building foundations not moving due to soil moisture


Creating effective subsoil drainage will give longevity to your home and provide for a more healthy environment. It’s a long-term solution that will pay for itself for years to come.

Types of subsoil drainage systems

The most common and most effective type of subsoil drain is when geotextile material is applied to special pipes. This type of pipe has many different attributes and characteristics which allow water to seep through efficiently. It allows for the highest flow of water to be removed from the site, decreasing the potential water damage. 

Moreover, the geotextile material serves to limit the amount of soil entering the pipe. The chance for blockages is decreased by preventing soil and other smaller particles from entering the pipe, allowing it to better remove water.

Other main types of subsoil drainage include:

  • Mole drainage – mainly used for places that experience heavy amounts of rainfall
  • Groundwater pumps – for places near streams and alike to ensure the excess water does not enter the area
  • Subsurface pipes – similar to subsoil 
  • Interceptor drains – usually used when water is constantly in the soil. it targets to collect and remove the water

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Installing subsoil drainage

A qualified plumber can determine which type of subsoil drainage is best suited for the area it will be installed in. Factors such as the land area, average rainfall and the type of soil are considerations we need to take into account.

This isn’t the kind of project you should do yourself. Incorrect subsoil drainage can actually make the problem worse and you should engage a fully certified plumber to ensure you have the most effective and long-lasting subsoil drain system.

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