Erosion control is the practice of preventing or controlling wind or water erosion and sediment run-off from agricultural land, development areas, coastal areas, river banks and construction sites. The unregulated discharge of sediment laden water from construction activities into waterways causes a significant environmental impact. As a result, there is growing awareness of this environmental damage and regulators are becoming more rigorous in the enforcement of environmental laws.
Revegetation is an important component of effective erosion and sediment control and for offsetting the impacts of development and land clearing. A well-established surface cover is one of the most effective ways to control erosion. Vegetation reduces the impact of raindrops falling on bare soil and wind removing soil particles. It also reduces the speed of water flowing over the land.
Typical erosion control solutions include hard armouring such as stone riprap, shotcrete and pavement and natural products such as jute blankets, mulching and turf. Geosynthetic options such as Geomats, Turf Reinforcement Mats (TRM), Geocells and geogrid reinforced Concrete Mats promote revegetation, handle surface runoff and prevent the movement of sediment into watercourses.
Erosion Control Solutions
|Flat Land ( < 1 in 10)||Mild Slopes ( >1 in 10 to <1 in 4)||Steep Slopes (> 1 in 4)|
|Erosion Control Blankets||Bonded Fibre Matrix||Concrete Mats|
|Nutrition Geomat||Compost Blankets||Cellular Confinement Systems (Geocells)|
|Gravelling||Erosion Control Blankets||Erosion Control Blankets|
|Mulching||Nutrition Geomat||Nutrition Geomat|
|Revegetation||TRM, 3D Geomat||TRM, 3D Geomat|
|Soil Binder||Turfing||Rock Amouring|
Until vegetation is established, Geosynthetics Australia’s erosion control materials offer temporary protection from soil loss. Nutrition geotextiles protect the soil from erosion while encouraging strong and healthy vegetation. Nutri Geomat is a biodegradable erosion control mat consisting of high strength polymer fibres, needle-punched with wool and plant fibres. The geotextile binds with the soil while the organic fibres prevent moisture loss and decompose to fertilise the growing seedlings.
3D Geomats are composed of layers of synthetic fibres, filaments, nettings and/or mesh. These fibres trap soil particles and seeds, support young vegetation, encourage rapid root growth, secure plant roots and promote healthy growth. Erosion control geomats help protect bare soil from raindrop and wind erosion and prevent it being washed away until a vegetative cover is established. As a result they also encourage infiltration and decrease soil crusting and compaction.
Turf Reinforcement Mats (TRM) improve the shear capacity of natural vegetation in channel and swale restoration. Once vegetation is established, TRMs can withstand water velocities and shear stress values up to 4.6m/sec and 49kg/m2, respectively.
For steeper slopes, bridge abutments, high water velocity situations and places where vegetation cannot be established, cellular confinement systems (Geocells), geogrid reinforced concrete mats, gabions, shotcrete or rip rap offer long term erosion control.
Commonly Used Materials
|Product||Short and Gentle Slopes||Steep Slope Stabilisation||Channel Lining||Swale Drain||Sediment Control||Wind Erosion||Coastal Erosion||Shoreline Structures|
|Rip Rap (scour and water erosion)||O||O||O||O|
|Gabions & Reno Mattresses||O||O||O||O|
|Turf Reinforcement Mat||O||O||O||O|
|Cellular Confinement System (Geocell)||O||O||O|
|Geogrid Reinforced Concrete Mat||O||O||O||O||O||O|
Geosynthetic erosion control products can last for a few months in the case of biodegradable Nutri Geomat, to over 75 years for concrete mats or geocells.