Leakdrain comprises a single cuspated core with very high compressive strength performance. This high compressive strength combined with high in-plane flow capacity allows the flow of leachate and other particle laden liquids without the risk of clogging, even under very high loads. The principal application of Leakdrain is as a leak detection layer for use within the basal lining of containment systems. It is installed between the primary and secondary barrier forming the basis of an efficient leak detection system. Leakdrain will not only assist in identifying the presence of a leak but also has sufficient capacity to collect the discharge and transport it to a collection point until the necessary repairs are made. Leakdrain can be installed quickly and easily and requires no specialist plant and only minimum training for the installation team.