Linear Drainage

Fin Drains and the Vialdrain drainage geocomposite ranges are a cost effective alternative to traditional stone drainage for highway edge drains and concrete central reservation drainage. The geocomposite collects and channels liquids and gases to a carrier pipe for transportation to a suitable discharge point along the highway.

Typical applications

  • Edge of carriageway fin drain drainage system
  • Drainage to concrete channels
  • French drains
  • Combined surface and sub-surface drainage


  • High water flows compared to traditional drainage stone
  • Space saving, narrow trench requirement
  • Re-use of site won excavated material
  • Reduction or elimination of drainage stone & haulage requirements

Fin drains provide a very high flow capacity, many times that of traditional crushed stone (specific data is available). This is due to the unique open structure created by the dimpled construction which allows un-hindered water flow.

Fin drain geocomposites, for highway edge and central reservation concrete channel drains, channel road surface water to a discharge drainage pipe, providing an ideal alternative to the construction of ‘traditional’ narrow stone filter drains, saving time and money on highway and railway construction projects.


VIALDRAIN is an innovative geocomposite designed specifically for efficient drainage trench systems. This advanced solution is comprised of a geogrid and two geotextiles, strategically engineered to enhance the performance of drainage trenches. The unique feature of VIALDRAIN lies in the configuration of its geotextiles, which collectively form a pouch at the base of the geocomposite. This intelligently designed pouch serves as a secure and seamless enclosure for the drainage pipe, streamlining the installation process. 

By integrating VIALDRAIN into drainage trench projects, the need for traditional gravels is eliminated, presenting a more modern and sustainable approach. This not only simplifies the construction process but also contributes to cost-effectiveness and environmental conservation. The geogrid reinforces the structure, providing stability and durability to the entire system, while the geotextiles prevent soil intrusion and facilitate water flow.

Vialdrain drainage core that collects and channels water from the road to a carrier pipe for transportation to a suitable discharge point.

Fildrain Type 6

Fildrain Type 6 highway edge fin drain provides vertical drainage on both sides, whilst acting as a barrier to protect the sub-base from inundation from the road verge. Fildrain Type 6 fin drain system is a double cuspated drainage geocomposite fully, wrapped with a filter geotextile and an integral pipe sleeve. The Fildrain geocomposite is laid alongside the trench, threaded with perforated pipe and dropped into a narrow trench before backfilling by pushing and compacting the excavated soil back into the trench adjacent to the drain. The surface is then covered with soil or a shallow apron of stone.

Fildrain Type 10

Fildrain Type 10 fin drain, a BBA certified system, is designed for highway concrete channel drainage. Benefits of Type 10 fin drain include the strong but flexible HDPE cuspated core which provides a regulated surface and creates a keying effect for the concrete to aid slip forming. The well bonded geotextile and dimpled surface gives a high friction surface to the underside.


Fildrain Type 7

Fildrain Type 7 fin drain is a BBA certified highway edge findrain system that incorporates a pipe with a sealed invert, ideal for when large volumes of surface water are to be collected.

Fildrain Type 5

Fildrain Type 5 is a BBA certified fin drain system, designed for highway edge drainage. The Fildrain Type 5 Fin Drain geocomposite strip allows the excavated material to be simply backfilled into the trench and requires no import of clean aggregate. At the end of each run, a Fildrain fitting is used to connect to the outfall pipe. Type 5 highway edge fin drain draiange system is a low cost system, with low embedded carbon which is suitable for manual or mechanical installation.

Typical Client Profile

  • Higways Contractors
  • Highway Engineers
  • Rail Engineers

Additional information

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