Geosynthetics

thumb|A selection of woven and non-woven geotextile samples

A geomembrane is a very low permeability synthetic membrane liner or barrier used with any geotechnical engineering related material so as to control fluid (liquid or gas) migration in a human-made project, structure, or system. Geomembranes are made from relatively thin continuous polymeric sheets, but they can also be made from the impregnation of geotextiles with asphalt, elastomer or polymer sprays, or as multilayered bitumen geocomposites. Continuous polymer sheet geomembranes are, by far, the most common.

thumb|upright=1.1|Geotextile sandbags protected the historic house Kliffende on [[Sylt island against storms, which eroded the cliffs left and right from the sandbag barrier.]] thumb|upright=1.1|Geotextile sandbags can be approximately 20 m long, such as those used for the artificial reef at Narrow Neck, Queensland. Geosynthetics are synthetic products used to stabilize terrain, contain liquids, drain liquids, and filter particles. They are generally polymeric products used to solve civil engineering problems. This includes eight main product categories: geotextiles, geogrids, geonets, geomemb

thumb|upright=1.1 upright=1.1|thumb|Geogrids are used to prevent sliding on long and steep slopes during installation and use of a landfill capping system. A geogrid is geosynthetic material used to reinforce soils and similar materials. Soils pull apart under tension. Compared to soil, geogrids are strong in tension. This fact allows them to transfer forces to a larger area of soil than would otherwise be the case.

confinement system used in construction and geotechnical engineering