Terram - a Fiberweb business

carluke park & ride

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Courtesy of Terram - a Fiberweb business

As part of their plans to improve transportation links in the region, South Lanarkshire Council, in collaboration with Strathclyde Partnership for Transport, funded the development of a £2million Park & Ride facility at Carluke Station, providing South Lanarkshire commuters with an additional 329 spaces, including disabled parking

The 0.8 hectare Park & Ride facility is situated on the west side of Carluke Station and due to the elevated position of the station in relation to the park & ride area, it was necessary to build appropriate pedestrian links, including a DDA compliant pedestrian access ramp. A key element of the design was the provision of an engineered drainage system behind the access ramp retaining walls. Inadequate drainage can result in a build up of groundwater behind a retaining wall and this ‘trapped’ water exerts hydrostatic pressure which can affect the structural integrity of the wall

Following thorough investigation into various drainage methods, civil engineers from South Lanarkshire Council’s Roads and Transportation Services determined that a Fin Drain system would be the most effective solution for the Carluke Station Park & Ride access ramp. Fin drains use prefabricated drainage composites in conjunction with traditional granular backfill to collect and help channel groundwater into the area’s main drainage system. The robust characteristics of composite materials ensure a highly sustainable solution that operates extremely effectively during the design life of the structure

Geocomposites used in subsurface drainage applications usually consist of a three-dimensional polymer core, which acts as the water channel, coupled with geotextile filters which allow water to pass into the core but prevent soil from washing through, thereby helping maintain soil stability

For Carluke’s Park & Ride facility, South Lanarkshire Council specified Terram’s 1BZ as the most suitable drainage composite for the access ramp’s drainage requirements

Commenting on the project, Gordon MacKay, Head of South Lanarkshire Council’s Roads and Transportation Services said:

 “We needed to ensure that the drainage system would be sustainable, providing the retaining walls with maximum protection from hydrostatic pressure throughout the life of the access ramp. The ease and speed of construction of Terram’s 1BZ geocomposite over conventional drainage materials made it the most practical solution for this particular project”

Terram 1BZ is a thermally bonded geocomposite consisting of a black polymer extruded grid core with a Terram nonwoven geotextile filter on one side and an impermeable LDPE film on the other, making it particularly suitable for vertical drainage applications where waterproofing is required, as in the case of retaining walls

At Carluke, Terram 1BZ was fixed to the access ramp’s retaining structure prior to the introduction of the backfill material. The 1BZ was positioned so that it would act as a vertical channel, directing excess groundwater into a perforated drainage pipe at the base of the walls which would be carried to the nearest main drainage system

The impermeable LDPE component of the 1BZ drainage composite prevents a build up of hydrostatic pressure, whilst the high flow rate and filtration provided by the geotextile filter and the polymer core ensures that the water drains away rapidly, maintaining soil stability and alleviating hydrostatic pressure

Civil engineering contractor, George Leslie Ltd was appointed by South Lanarkshire Council to construct the access ramp and associated retaining walls, connecting the park & ride facility to the station

“The flexibility and easy handling of the Terram 1BZ drainage composite made installation very simple and problem free”, said Scott Rowan, George Leslie’s Site Agent for the Carluke construction project

Terram drainage composites are designed for a wide range of applications where drainage is required:

  • Roads
  • Landscaping and roof gardens
  • Retaining walls
  • Buried Structures
  • Tunnels

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