Coastal & Waterways

Coastal & Waterways

Many coastal and waterway applications commonly use TERRAM Geosynthetics including

Foreshores, dams and flood bunds, river and canal banks, lagoon, lake and reservoir shores, culverts and outfalls, ports, breakwaters, artificial islands and causeways. 

TERRAM Defencell geocells are used for temporary flood protection where a fast response in required and local fill materials are available.

TERRAM Geocells are three-dimensional blankets of interconnected cells which are placed on slopes, secured in position using pins, and filled with soil.

The Geocells are formed from TERRAM Geotextile to confine the fill and the permeable walls allow drainage from cell to cell down the slope. 

Other available geocell systems achieve this cell-to-cell drainage by perforating the walls. However, this process can lead to weaknesses as geocells fabricated from impermeable materials suffer from weiring - water cascading down the slope from cell to cell – and this causes ongoing loss of soil from the cells.

Controlling erosion on coastal and waterway slopes

TERRAM Geocells provide immediate stability by confining the fill and greatly improving resistance to wind and surface run-off erosion.

Many variables affect the installation and performance of a slope-protection geocell, including slope angle, slope stability, the infill type, rainfall levels and irrigation (if included). It is important therefore that due consideration is given to all relevant criteria on a project by project basis.

With a topsoil fill, the stability is further enhanced as vegetation becomes established and a geocell can be used to establish vegetation on slopes where creating cover would otherwise have been problematic. The honeycomb of cells provides protection for the vegetation during the early, sensitive period of germination and growth.

Typical applications include:

• Cuttings and embankments
• Noise-deflection and environmental bunds
• Abutments
• Steepened slopes
• Drainage ditches
• Balancing ponds
• Soil nailing cover