Water seepage control is one of the crucial areas in civil engineering, environmental management, and landscaping. Whether it is the artificial lake construction at a resort, lining a landfill site so that it will not contaminate the adjacent land, or protection of an underground garage from potential water damages, impervious systems become inevitable. Recently, geosynthetics have been developed to address such practical challenges in an effective way. Among such, one of the most popular is the Geosynthetic Clay Liner, or GCL, composed of natural bentonite clay combined with geotextiles.