Pozidrain has a number of applications as part of a risk based approach to land remediation, and allows developers to reduce and control contaminants in order to meet regulatory requirements.
Pozidrain drainage geocomposite can be used as a capping membrane to provide a barrier to collect and drain rain water from the clean cover soils.
Leakdrain is a leak detection system used between primary and secondary containment barriers. Any leakage through the primary liner is intercepted by the Leakdrain and controlled to reduce the hydrostatic head on the secondary liner, and therefore minimises the risk of contaminating groundwater.
Pozidrain can also be used as a leak detection layer where filtration is also required, such as under a compacted clay liner (CCL) or geosynthetic clay liner (GCL).
The solution is frequently adopted for remediation of mine tailings sites as part of Defra’s Water and Abandoned Metal Mines programme, in partnership with the Coal Authority and the Environment Agency. As part of the remediation plans for contaminated mining sites, former tailings storage facilities are permanently capped to prevent rainwater infiltration and block pollutants from entering nearby water sources.
Pozibreak is designed specifically as a drainage void layer to protect the ground above from the capillary rise of moisture from below. The cuspated core maintains a void between clean and contaminated soils to prevent capillary action, whilst also providing high multi-directional flow.
In desert or arid regions Pozibreak is used as a salt barrier to prevent saline water manifesting at the surface and causing problems in clean cultivated soils. It can also be used to prevent clean water being drawn into the freeze/thaw zone at the surface, which prevents the formation of ice lenses and the subsequent surface collapse when the ice melts.
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