Geosynthetics manufactured from polymeric material are gaining popularity as one of the versatile construction material used with soil, rock, earth, or other geotechnical engineering related material as an integral part of a man-made projects like retaining walls, embankment for roadway and railway, to derive benefits out of its presence. Road pavements are one of the areas where use of geosynthetic is gaining momentum. When geosynthetic is used in pavements or other structures, it may require performing more than one function like separation, reinforcement and drainage, filtration and liquid barrier. Wide variety of geosynthetics are available in market from which one can choose a geosynthetic depending upon the function to be performed by the geosynthetics. Their selection to perform one or more than one function depends on the physical, mechanical and hydraulic properties of the geosynthetics.