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Coastal & River Defence

Marine erosion can occur when the sea is energised by wind and gravity to produce waves, tides, and currents: it is caused by corrosion, abrasion, and hydraulic processes. When these impinge on the shoreline, they cause coastal attack through the process of beach and toe erosion leading to over steepening of soil or rock lopes. A similar phenomenon can occur in rivers, where the agents are corrosion, hydraulic lifting, scouring, cavitation and mechanical erosion by wind or running water charged with detritus.

HPS-C for Coastal and Marine Applications

Our Product Range for Coastal and Fluvial Erosion Control

The benefits of using geosynthetics are often undervalued in their impact to the stability of a hydraulic defence structure, partly because the unit cost is so small compared with armourstone.  The consequences of not designing and specifying them correctly can be catastrophic, potentially threatening the stability of the whole structure.

When correctly specified and installed the use of a geotextile can offer huge savings on a project and increase the life of the structure significantly.

GEOfabrics HPS-C geotextiles are designed to be used as filter/separators in hydraulic defence structures: they are placed on lower permeability beach materials to prevent the escape of fine particles while permitting the free passage of water, and provide a stable and consistent bedding layer, often relinquishing the need for one or more layers of armourstone resulting in huge cost savings.

GEOfabrics HPS-C Geotextiles are used as a cost-effective alternative to traditional underlayers and provide benefits for toe design. Our HPS-C range has been designed specifically to resist critical construction loads with high strength and high elongation to prevent damage and can often be installed without the need for a smaller granular layer.


  • GEOfabrics HPS-C can be used as an effective replacement for underlayers, saving in materials, transport, and placement.
  • The amount of ‘lost’ material at the toe is minimised by preventing stones burying themselves into a soft subsoil.
  • Differential settlement is reduced, helping with long-term maintenance of alignment of a revetment or breakwater.

Related Downloads

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Installation Guides & Certificates

River & Coastal Installation Guidance


Coastal And River Defence Brochure

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