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Coastal & Waterways

Erosion Control

Overview

Slopes are subject to a range of erosive forces that can can cause slope failure such as rainwater run-off or wind. Climate change is one of the primary causes of progressive erosion problems on a global scale. TERRAM Geocells are highly effective at providing immediate stability to slopes by confining the fill in their threedimensional honeycomb structure, increasing their resistance to erosive forces.

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Frequent Problems

Slope Erosion

  • Alternative solutions often involve unnecesary complicated and expensive construction techniques.
  • Climate change is one of the primary causes of progressive erosion problems on a global scale, increasing the need for erosion control solutions.
  • Some slope structures make it difficult to establish vegetation with covers.
  • Geocell solutions fabricated from impermeable materials suffer from weiring, water cascading down the slope from cell to cell, causing ongoing loss of soil from the cells
  • Other Geocells achieve cell-to-cell drainage by perforating the walls, leading to weaknesses

Without TERRAM

  • Alternative solutions often involve unnecesary complicated and expensive construction techniques.
  • Climate change is one of the primary causes of progressive erosion problems on a global scale, increasing the need for erosion control solutions.
  • Some slope structures make it difficult to establish vegetation with covers.
  • Geocell solutions fabricated from impermeable materials suffer from weiring, water cascading down the slope from cell to cell, causing ongoing loss of soil from the cells
  • Other Geocells achieve cell-to-cell drainage by perforating the walls, leading to weaknesses

Our Solutions

  • High resistance to erosive forces causing slope failure, such as water run-off and wind.
  • Permeable material allows cell-to-cell drainage without compromising its resistance and helps establish and protect vegatation on slopes, which increases the overall stability.
  • Its 3D honeycomb design structure provides a blanket of 'cells' on the slope surface which can contain a variety of infill materials depending on the application.

With TERRAM

  • High resistance to erosive forces causing slope failure, such as water run-off and wind.
  • Permeable material allows cell-to-cell drainage without compromising its resistance and helps establish and protect vegatation on slopes, which increases the overall stability.
  • Its 3D honeycomb design structure provides a blanket of 'cells' on the slope surface which can contain a variety of infill materials depending on the application.

Product Solutions

Geocells

TERRAM Geocells are three-dimensional blankets of interconnected cells which are placed on slopes and filled with friable topsoil to provide immediate stablity and resistance against erosive forces such as water run-off or wind.

Common

Applications

End Use

Common uses of TERRAM Geocells to prevent erosion control in coastal and waterways applications include:

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Cuttings and Embankments

Noise-deflection and Environmental Bunds

Abutments

Steepened Slopes

Drainage Ditches

Balancing Ponds

Soil Nailing Cover

Case Studies

Ability to carry out projects of all sizes

GEOCELL & DRAINAGE GEOCOMPOSITES – Slope stabilisation for major landscaping works (Glasgow) GEOCELLS & DRAINAGE GEOCOMPOSITES – Preventing embankment erosion (M25) GEOCELL – Green bund system (Busk Meadows, Sheffield) GEOCELL – Lagoon slope vegetation control (Milford Haven Oil Refinery) GEOCELL & T1000 – Erosion control for canal slope (Monmouth and Brecon Canal)

Frequently Asked Questions

Can Terram Geocells be used to form retaining walls?

Yes, TERRAM geocells can be used to form retaining structures although this is not an application area that we actively promote in the UK market due to historic lack of demand. Different grades of TERRAM Geocells can be manufactured specifically for retaining structure applications but are made to order and there is a minimum order quantity. 

What grade of Geocell do I need on a slope?

Generally, for slopes up to 30 degrees, grades 35/10 & 35/15 are recommended. For slopes between 30 and 45 degrees, grades 25/10, 25/15, 22/20 are suitable options. Additionally, with the recent addition of Terram HDPE Geocell to our product range, you can also consider the Terram HDPE Geocell option. Please see the Terram Geocell erosion control SDI (specification, design, and installation) guide for more details.

Are Terram Geotextile Geocells permeable?

Yes, TERRAM Geotextile Geocells are manufactured from 100% permeable nonwoven geotextile fabric allowing ground water to pass through the cell walls rather than cascading over or underneath causing soil erosion.

Can I staple Geocells together?

Geocells can be stapled together using heavy duty galvanised metal staples, UV stabilised nylon cable ties or steel u-bars. Minimum 3 staples per joint at 25mm spacings. Please refer to the Geocell erosion control SDI for further details. 

How do I fix the Geocell panels?

The standard fixing method for a TERRAM Geocell on a slope is using an array of 500mm long 8mm diameter mild steel u-bars in soft to firm ground conditions. Installing a Geocell panel on an impermeable surface, hard or soft & loose sandy ground may require alternative fixings. The panels should also be fixed in anchor trenches at the top and bottom of the slope prior to filling.

Can I cut Geocell panels?

Terram Geocells are available in two variants: Terram geotextile geocell and Terram HDPE geocell. The Terram geotextile geocell is manufactured from strips of stiff but flexible nonwoven geotextile material that is chemically bonded at the joints to form honeycomb panels. These panels feature cells with strip widths (panel heights) ranging from 100mm to 200mm.

On the other hand, the Terram HDPE geocell is made of high-density polyethylene (HDPE) material. It also features honeycomb panels with cells ranging in strip widths (panel heights) from 100mm to 200mm. The inclusion of Terram HDPE geocell in our product range provides an alternative option for soil stabilisation and erosion control applications.

When working with Terram geocells, whether it is the geotextile geocell or the HDPE geocell, it is recommended to follow appropriate safety guidelines. Cutting single layers can be done by hand using safety knives or sharp scissors, with a downward action close to the joints. It is essential to wear suitable personal protective equipment, such as gloves and eye protection, to ensure safety during the installation process.

How are Geocells delivered?

Flat packed, palletised and strapped.  

What is the size of the Terram Geocell panels?

Most of the Geotextile Geocell panels are approximately 7m x 5m when fully opened, the 200mm deep cells are approximately 6m x 3m. The panel weights are all below 25kg for manual handling reasons.

Terram HDPE Geocell panels are either 2.5m X 6.5 m or 2.5m X 8.3 m depending on the weld spacing. The panel weights are all between 26kg to 40kg for manual handling reasons.

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