Geosynthetic Clay Barriers are hydraulic barriers, “constructed components” that are a fundamental part of a barrier system for solid and liquid waste disposal. Capping of solid waste disposal containers at the end of their working life. The entire waterproofing barrier system is composed of the Clay Geosynthetic Barrier and provides constant protection for underground structures during their short or long – term working life. Improving vertical stress distribution on the subgrade. GCL can be place a vertical blanket of “pervious” sand or gravel behind retaining walls for protection against hydrostatic pressures.