ABSTRACT
The movement of water through granular porous media is a basic part of hydrodynamics. The purpose of this chapter is to present the modification of drag models to determine the permeability of geotextiles used in leachate drainage systems in landfills. The principal models of fluid flow through any porous media are: The first four have been used to investigate the water flow through geotextiles. According to experimental data, the experimental constant A is between 65 and 76 for geotextiles, having a porosity ranging between 0.85 and 0.95. The drag model is based on the assumption the flow through thick geotextiles corresponds to the flow around a single bundle of fibres in one direction. Consider a thick geotextile sample with a porosity between 0.80 and 0.95, area A i, and thickness T g. An important field of geotextile research is the determination of the coefficient of permeability. The movement of water through granular porous media is a basic part of hydrodynamics.
