Fabrics are used for a variety of purposes, including:
Separation: They prevent different soil layers from mixing, such as keeping a gravel base separate from the subgrade soil.
Filtration: They allow water to pass through while retaining soil particles, which is useful in drainage systems.
Reinforcement: They can add tensile strength to soil, improving its stability in retaining walls and embankments.
Drainage: They can channel water away from a structure or area.
Erosion Control: They protect soil from being washed away by rain or wind.