This allows water to enter the drain pipe and keeps the soil out of it.
Geomembrane, generally refers to water-impermeable material. Geotextiles, generally refers to the permeable material. It is frequently seen that drain-pipe is wrapped with geotextile. It is also seen that the upper part of drain-pipe is wrapped with geotextile, while lower part is wrapped with geomembrane. It is rarely seen that outside the drain-pipe is all wrapped with geomembrane. Because it is more reasonable and convenient that we can use unwrapped tube wall and impermeable tube.
