By T. S. Ingold
An important introductory reference guide for somebody specifying, preserving or production geotextiles and geomembranes
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Other test methods are based on the use of a constant flow velocity, rather than a constant head, with test results of test being quoted in terms of the measured head loss at this velocity. Again, if turbulent flow is involved, Darcy's law will not apply. 3 Transmissivity When used without qualification the coefficient of permeability of a geotextile, kg, refers to permeability normal to the plane of the geotextile. To give it its fuller description this permeability is termed the coefficient of normal permeability, kng.
An excellent source of information on index tests for geotextiles comes, on disk or hard copy, in the form of the IGS Geotextile Inventory, Rigo et al (1990), which not only provides details of a large number of standard test methods but also lists the particulars of major institutions including personal contacts. Among other things the International Geotextile Society, (IGS), which is a professional society dedicated to the scientific and engineering development of all geotextiles, geomembranes and related products, regulates the international conferences which are a font of information on testing and all other aspects of geosynthetics.
25(v). 25(o), or a fence, serving as a sand barrier to prevent the transportation of wind born sand. In this latter role the geotextile serves as an energy absorber. The fence reduces the velocity, and therefore the energy, of the wind, and so reduces its ability to carry the sand which is then deposited on the windward side of the fence. 4 Erosion control The destructive force in soil erosion is the energy of the eroding elements such as wind and rain. A geotextile, usually in the form of a mesh or mat used to cover exposed soil, functions to absorb the kinetic energy of raindrops, thereby reducing their ability to detach soil particles.