02 · EVO Rock Bags
Erosion and scour control that is quick to deploy
EVO Rock Bags are flexible nets filled with rock or crushed concrete, used for erosion control, scour control and stabilization of soil.
They are a better solution than loose concrete, gabions, block stone and rip rap: high-performance erosion and scour control that is efficient and effective to deploy, in standard and emergency construction.
How they work
Decades of civil and soil engineering experience
The rock bags are filled with graded rock as a flexible, ecologically advantageous engineering solution. For erosion and scour applications, the smaller graded rock within the net reduces flow velocities by absorbing water energy into the high interstitial spaces between the rocks, in both fresh and salt water.
Those spaces also provide habitat for invertebrates and accrete fines, gravels and silts, which allows vegetation to establish naturally over time. In soil stabilization, the rock bags become a large mass that complements and integrates with the existing natural structure.
The bags are easy to fill and to handle through a ring that is the single point of contact during installation. Because they are flexible, they conform to the surface, which removes the need for site preparation in most cases.
Applications
Common applications, with almost a million rock bags deployed
The rock bags can be used independently or as part of a bioengineering design with vegetated systems above water level, pairing habitat biodiversity with an engineered approach to asset protection.
River Bank Revetment
Stepped Bank Revetment
Bank Foot with Gabion
Bridge Pier Scour Protection
Shoreline & Intertidal
Bank & River Bottom Protection
Sectors
Where rock bags are used
Roads
Bridges
Outfall & Drainage
Coastal
Ports
Rivers & Waterways
Offshore & Subsea
Emergency & Soil Stabilization
Advantages
Why specify rock bags
Easy to fill
Easy to fill in a production setting.
Quicker to place
Less work and quicker to place.
Safer to use
Safer to use on site and in the water.
Fresh & saline water
Used in fresh and saline water environments.
UV & abrasion resistant
Highest UV resilience and anti-abrasion of any net product.
Bioengineering ready
Use independently or as part of a bioengineering design with vegetated systems above water level.
Specifications
Rock bag sizes
| Rock bag | Mesh | Recommended rock size (mm) | Height (m) | Diameter (m) | Volume (m³) | Weight, empty with ring (kg) | Resistance to currents, single (m/s) | Resistance to currents, grouped (m/s) |
|---|---|---|---|---|---|---|---|---|
| 2 ton | 25 mm | 50 – 200 | 0.4 | 1.9 | 1.13 | 6.0 | 3.2 | 4.7 |
| 4 ton | 25 mm | 50 – 200 | 0.6 | 2.4 | 2.71 | 12.5 | 3.6 | 5.3 |
| 8 ton | 50 mm | 75 – 200 | 0.85 | 3.0 | 6.00 | 39.0 | 4.0 | 5.9 |
| Rock bag | Mesh | Recommended rock size (in) | Height (ft) | Diameter (ft) | Volume (ft³) | Weight, empty with ring (lb) | Resistance to currents, single (ft/s) | Resistance to currents, grouped (ft/s) |
|---|---|---|---|---|---|---|---|---|
| 2 ton | 1 in | 1.6 – 8.0 | 1.3 | 6.2 | 39.22 | 13.2 | 10.5 | 15.4 |
| 4 ton | 1 in | 1.6 – 8.0 | 2.0 | 7.9 | 97.98 | 27.5 | 11.8 | 17.4 |
| 8 ton | 2 in | 3.0 – 8.0 | 2.8 | 9.8 | 211.10 | 85.8 | 13.1 | 19.4 |
Resistance to currents is the flow velocity at which the bags show no movement, placed singly and grouped.
Technical documents
Additional information
Choose a document and send us your name, company and email. We will reply with the file.
Contact
Request a rock bag quote
Whether your project requires cryogenic valves, rock bags or manpower, let us be your first contact. We will deliver to your exact requirements and provide a quality solution on time and on budget.
- +971 52 552 0113
- info@evosnt.com
- EVOSNT Trading FZCOBuilding A1, Dubai Digital ParkDubai Silicon OasisDubai, United Arab Emirates