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Geonets are classified as geosynthetic materials comprising of integrally connected parallel sets of ribs overlying similar sets at various angles. When the ribs are opened, relatively large apertures are formed into a net-like configuration.

Their primary function is to provide in-plane drainage of liquids and gases of structures. Geonets are generally used between geomembrane liners as part of a leak detection system as well as above and below geomembranes to move liquids or to provide a path for gases.