Pond and dam liners
Leaking dams not only waste valuable water but seepage weakens dam walls and can cause them to collapse. To overcome this problem, Geosynthetic Clay Dam Liners (GCLs) are used to stop water leaking from storage dams and irrigation canals. GCL dam liners also prevent embankment seepage from weakening the structure.
Their low permeability, high internal shear strength and easy installation make geosynthetic clay liners ideal for effluent ponds, tailings dams, farm dams, ponds, lakes, wetlands and irrigation canals. GCL dam liners provide hydraulic containment, slope stability and quick installation.
Reinforced GCL dam liners consist of a layer of low permeability sodium bentonite clay between two geotextiles. A needle-punching process bonds these geotextiles tightly together. Natural sodium bentonite absorbs water to create a high swelling, self-healing and low permeability dam liner. For high head conditions a geomembrane can be bonded to the GCL to provide dual layer liner.
- Dams and dam wall liners
- Ornamental ponds
- Effluent ponds
- Stormwater retention ponds
- Canal Liners
Dam liner installation
Using geosynthetic bentonite clay liners prevents the loss of valuable water. They are particularly recommended in remote locations or where hauling clay is impracticable. Lining farm dams with GCL is very cost effective because it can be done with basic farm machinery. Unlike HDPE membranes, clay liners do not require specialised equipment to weld the joins.
Before laying the GCL, the surface must be well prepared. A heavy roller is used to compact and smooth the soil. There should be no abrupt elevation changes, voids, cracks or standing water. Remove or cover all sharp-edged rocks, stones, sticks, etc, to at least 12mm to avoid liner damage.
To prevent the liner sliding down the dam wall, anchor the GCL rolls into a trench at the crest of the dam. Unroll the GCL down the dam face using a backhoe and spreader bar assembly. Finally seal the overlaps with bentonite clay granules and cover the GCL with 30cm of soil. Once laid, avoid vehicular traffic.
Liquid Containment Bunds
Industrial liquid storage usually requires a spill containment bund to protect against potential leaks. Geosynthetic clay liners reduce the likelihood of site soil and groundwater contamination and subsequent remediation and rehabilitation costs. GCLs are compatible with most liquids likely to spill into the containment bund. Our PE coated geosynthetic clay liners provide an additional barrier to liquid migration and ensure that the bentonite clay remains hydrated over time.