... being washed away 4.Sample are free 3D geomat for slope protection and erosion control 3D Geomat is a king of ... .C. Replace the concrete, asphalt, and block, using in the slope surface protection of roadway, railway, river-way, dyke, and the ... ) Instead of concrete, asphalt, stone and other slope protection material, mainly apply to slope of road, railway and river lane, dams and ...