When one uses a geotextile across or under a geonets or makes a geotextile-geonets-geotextile sandwich, the separation and filtration functions are always contented, but the drainage function is vastly improved across geotextile by themselves. Situated horizontally, they make great drains to upwardly moving water in a capillary zone where frost heave or salt migration is an issue. When the water passes the sandwich it travels horizontally within the geonets and apart from where damage can occur.
Such geocomposites have as well as been used in intercepting and conveying leachate in landfills and for running vapor or water below pond liners of various types.
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