What is subsoil drainage?

Subsoil drainage protects your property from water damage. This system are used to remove excessive water from the soil surrounding your property in architectural, sewage and irrigation applications and to provide water to plants as well as drain sewage away from your property. A subsoil drainage system is installed within the ground and should be installed by either a landscaper or qualified plumber.subsoil 2

Purpose of subsoil drainage:

  • It increases the stability of the ground
  • Reduces building foundation movements due to the variations in the soil moisture content
  • Increases soil strength
  • Protection from water damage

Types of subsoil drainage:

The most commonly used subsoil drainage system is a special pipe covered with geotextile material.  A number of perforations are through the pipe to let water through to be drained. The geotextile covering is crucial as it prevents soil and other materials coming into the pipe and causing a blockage.  Rock and pebbles may also be used as filtering materials. To prevent excessive clogging, drainage pipes should be about 7.5 cm or more in diameter. Trenches should be a minimum width of 300 mm where circular pipes are used. For most simple water drainage systems like sewage use, pipes made from clay, cement or plastic can be used.

Drain envelopes are placed around a subsoil drain for various purposes, including:

  • To prevent excessive soil movement
  • To increase to effective surface area of the drain
  • To stabilize the soil in which the drain is located
  • To provide structural bedding for the pipe

subsoil4You are probably wondering where to install this subsoil drainage system by now. If your property has a retaining wall, it is a good idea to install the subsoil drain system behind it to relieve water pressure. Another good spot is in the lower areas of your garden where water usually accumulate. Installing a subsoil drainage system around the perimeter of your home is wise, as the water gets drained before it reaches foundations.


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