It is, as the name implies, a drainage system that is located underground. The drainage system comprises various pipe lengths and fittings such as bends, junctions, and other fittings that allow the pipe to change direction or adapt to another method. An underground drain is commonly known as the sewage system since it primarily conveys waste water (grey water) or foul water straight to the sewage treatment plant. This technique can also drain rainwater into a soakaway or watercourse.
These days, most systems are composed of PVC. This is because PVC is a lightweight yet sturdy material that lasts a long time and is less expensive to manufacture than clay or concrete. It is also easy to install and practically totally maintenance-free due to its small weight. The inner wall is smooth, which facilitates the passage of wastewater, and PVC has a higher “flow rate” than clay or concrete.
An underground drain system is easily identified since it is terracotta in color, which is the industry standard for this system. Surprisingly, dirt pipes and fittings are nearly identical, having been manufactured on the same machinery. The main difference is that they will be black, white, or grey in color and include a UV additive to prevent deterioration from sunlight.
