The permeability of geotextile is one of its hydraulic properties, which is reflected in its filtration and drainage properties. That is to say, when it is necessary to exert filtration and drainage functions, the permeability performance is the indicator to measure them. So the editor will introduce to you what determines the permeability of geotextile for an afternoon, and how to choose geotextile when filtering drainage? Geotextile
1. One is materials: different materials have different affinity for water, and geotextiles made of polyester are generally used in China because they have good water permeability.
2. Needle length: For geotextiles, the longer the needle length, the larger the gap and the better the permeability.
3. The angle of penetration during acupuncture: The larger the angle of penetration, the better its waterproof performance, while on the contrary, its water permeability is not very good.
4. Thickness: The thicker the thickness, the slower the water infiltration and the worse the water permeability.
5. Density: The denser the density, the smaller the pores between fibers, the lower the water conductivity, and the worse the water permeability.

Selection of geotextile for filtration and drainage
The filtration performance of soil mainly includes two aspects, one is breathability and the other is sand retention. That is to say, while geotextiles play a role, on the one hand, it is necessary to ensure that excess water is discharged, and on the other hand, it is also necessary to ensure that the soil does not lose. Therefore, when making a selection, it is important to consider the relationship between the size of soil particles and the pore size of the geotextile.
When selecting geotextiles for filtration and drainage, attention should be paid to the following parameters: fiber density, strength of adhesion between fibers, uniformity of fiber distribution, size of fiber pore size, thickness, and so on.
Although there are many properties of geotextile, in the actual use process, if not strictly operated, the performance of geotextile cannot be fully utilized, and even if it can be used, the role that performance can play is greatly reduced.