River Canal and coastal work
Erosion protection structures or armor systems dissipate the hydraulic forces that cause erosion, and they preserve the subgrade soil or fill soil behind it. A geotextile is required between the subgrade soil and the rip-rap, gabions or pre-cast blocks to prevent piping and erosion of the soil while allowing the free passage of water. The primary function of the geotextile in erosion control is filtration to minimize erosion of the subgrade soil behind the armor system. Geotextile offers a combination of properties that make it ideally suited for permanent erosion control applications: Permittivity allows drainage Non-woven, thermally bonded fiber structure minimizes the piping and erosion of subgrade soils Tough, strong and durable Easy installation Made of polypropylene, which resists rot, mildew, microorganisms and chemicals Geotextile’s tensile strength, puncture resistance, tear resistance, opening size and hydraulic properties make it anideal filter fabric for permanent erosion control systems. The primary design requirement of apermanent erosion control system is the development of a graded aggregate filter layer in the subgrade soil. Geotextile resembles a well-graded aggregate filter. Geotextile provides an effective filter structure since it has both high permeability and the ability to retain soil particles adjacent to it, which minimizes the piping of subgrade soils and reduces fine particles from entering the watercourse.