Terrain Underground Drainage

Below ground drainage systems for commercial buildings

Using the latest plastics manufacturing technology to satisfy the requirements of today's installers, our below ground drainage range offers both rigid and foam core pipes and a comprehensive range of fittings to suit all underground drainage applications. They boast a long service life in excess of 50 years, taking fluids from inside and outside of buildings, linking soil, waste and rainwater systems to the sewers.


All our below ground systems are manufactured to the Underground Drainage (EN 1401:1998) and Plastic Inspection Chambers for Drains and Sewers (EN 7158:2001) standards.

Features & Benefits


  • Easy to lay
  • Flexible - accommodates normal ground movement
  • Adaptable - can be connected to existing drainage systems
  • Suitable for commercial building applications
  • Fully accredited



View our product range below.

Literature & Technical info