Draped Mesh System
A draped mesh system, sometimes known as simple drapery, consist of nets or netting that are supported by a bearing rope system anchored to the brow of a slope. The mesh is draped across the slope in a manner to maximize the slope contact. The slope is allowed to erode behind the mesh layer, which acts as a barrier to control the movement of debris as it progresses down the slope, often into a catchment ditch at the toe.
The most important material parameters to consider for design are the unit weight, tensile strength and puncture strength. As the need to control larger debris increases, so does the need to increase the strength of the draped mesh system.
Draped mesh systems serve a different purpose than slope retention systems (anchored mesh): where a draped mesh is meant to control the movement of debris along the slope, anchored mesh is designed to retain the masses in situ and prevent erosion and shallow landsliding. Which is best for a site is determined by considering not only the physical characteristics but also budgetary and maintenance requirements.
