GABION CYLINDRICAL ROCK ROLLS SIZE 2X0.3M

Rock rolls Rock Rolls are a tubular revetment consisting of small stones retained within a high strength polyethylene net. Rock Rolls are used in all areas where vegetation alone will not provide sufficient erosion control. Salix Rock Rolls have been designed to provide invertebrate habitat and to accrete fine sediment to enable vegetation establishment within the Rock Roll. Rock Rolls can be combined with bioengineering solutions to create fully vegetated revetment Rock Rolls have been developed in partnership with the European Soil & Water Engineering Group (ESWEG). NET SPEC Net Material: 3mm Synthetic Polyethylene braided knotted nets Net Apertures: 45mm Net Yarn Thickness: 3mm Single Mesh Tensile Strength: 152,4 kg = 1,495 kN/mesh U.V. treated 350 Kly Colour: black UNIT SIZES STONE SPEC Weather and frost resistant rock Grading: 50 to 11Standard sizes are shown although Rock Rolls can be made different lengths. Standard Length: 2 metres Diameter: 250mm, 300mm or 400mm Weight per Metre: 250mm diameter: 100 kg/metre 300mm diameter: 120 kg/metre 400mm diameter: 180 kg/metre Rock Rolls have been tested at the University of Dresden, Germany. Rock Roll Performance Maximum permissible flow velocity: 6m/s Maximum wave height: 0.6 m - Maximum Shear Stress: 800N/m2 Rock Rolls used with Coir Rolls on a cobble bed stream SUMMARY OF ROCK ROLL BENEFITS • Uses smaller stones than gabions which increase invertebrate habitat and increase sediment deposition • Allow vegetation establishment • Flexible over uneven ground • Length and diameter can vary • If used in front of a pre-established coir roll the Rock Roll protects the coir roll from abrasion. This allows vegetation to be established in high energy areas. • Netting not liable to abrasion of coating followed by rusting and failure like wire mattress