EVOSNT, the manufacturer of EVO Rock Bags, has its office in Dubai Silicon Oasis. This page is for engineers, contractors and asset owners planning erosion or scour protection on projects in the UAE and the wider Gulf.
Rock bags are used here for the same jobs as anywhere else: toe protection on coastal revetments, bank armour in creeks and lagoons, and scour aprons at ports and outfalls. What changes in the Gulf is the exposure: strong sun, high temperatures and salt water at the same time, often on reclaimed land.
Where rock bags are used on Gulf projects
- Toe protection for seawalls and revetments, and shoreline protection on reclaimed land. See coastal and shoreline protection.
- Bank armour in tidal creeks, lagoons and marinas, where currents run in both directions with the tide.
- Quay walls, berths and ramps, where propeller wash and thrusters scour the toe. See port and quay wall scour protection.
- Stormwater and cooling-water outfalls, where a concentrated jet meets the bed. See outfall and culvert protection.
- Pipeline and cable landfalls and subsea crossings. See offshore and subsea protection.
Design points for heat, UV and salt water
- Sunlight. Above the waterline, the net is exposed to strong sun for most of the year. Ask for our Service Life & Durability Summary and set the design life against the exposure, as you would for any synthetic material.
- Salt water. EVO Rock Bags are used in both fresh and saline water. Check the fill rock for durability in sea water with your materials engineer.
- Fill. Rock or crushed concrete, graded 50 to 200 mm for the 2 and 4 ton bags and 75 to 200 mm for the 8 ton bag, where the specification allows.
- Reclaimed and sandy beds. A flexible bag settles with the bed instead of cracking or tipping, which is why bags are used at toes where the bed can move. The filter beneath the bags is a design decision for the engineer.
- Waves. Our published ratings are for currents only. On an exposed coast, send the wave conditions and we will advise on size and layout, or work with your coastal engineer.
Sizes in metric units
Ratings are the flow velocities at which the bags show no movement, placed singly and as a group. Pick the size with the size guide.
| Size | Height (m) | Diameter (m) | Volume (m³) | Single (m/s) | Grouped (m/s) |
|---|---|---|---|---|---|
| 2 ton | 0.4 | 1.9 | 1.13 | 3.2 | 4.7 |
| 4 ton | 0.6 | 2.4 | 2.71 | 3.6 | 5.3 |
| 8 ton | 0.85 | 3.0 | 6.00 | 4.0 | 5.9 |
Approvals are the project engineer's
On a Gulf project, rock bags are designed and approved through the project's consultant and the relevant authority, like any other marine or drainage work. We provide the product data and documents for the submittal; the design and the approval stay with the engineer.
Our specification clause and manufacturer checklist list what a reviewer will ask for.
What to send from a Gulf site
Call +971 52 552 0113, email info@evosnt.com, or use the form below.
- Project location and a dimensioned drawing of the area to protect
- Design current velocity at the bed, or the propeller wash calculation at a berth
- Water levels and tide range, and wave conditions on an exposed coast
- Bed material, and whether the area is reclaimed
- Access for a crane or excavator from land, or from a barge
Questions
- Where is EVOSNT's office?
- EVOSNT Trading FZCO is at Building A1, Dubai Digital Park, Dubai Silicon Oasis, Dubai, United Arab Emirates.
- Can rock bags be used on reclaimed land?
- Yes, as toe, bank and bed protection. The flexible bag settles with the bed. Fill, filter and layout are design decisions for the project engineer.
- Who approves rock bags on a UAE project?
- The project's consultant and the relevant authority approve the design, as for any marine or drainage work. We provide the product data and documents for the submittal.
Published by EVOSNT Trading FZCO, manufacturer of EVO Rock Bags. Product figures are from our technical specifications. General guidance only; the project engineer is responsible for the final design.
