A threaded, perforated or slotted pipe with multi-layered filter screen to provide a hydraulically efficient low head-loss embankment drainage system.

TerraFilter™ can be used for ballast drainage in on-track drainage systems and pressure relief wells in off-track systems. 



Relief wells for:

  • Ballast drainage
  • Embankment & cuttings
  • Cliff face stabilisation 
  • Tunnel roofs & side walls


  • Hydraulically efficient 
  • High open area
  • Flush threaded
  • Quick & easy to install 
  • High crush resistance
  • Can be back flushed