Gabion reservoir protection systems for critical water storage infrastructure. These flexible, gravity-based structures are primarily used to prevent soil erosion along reservoir perimeters and protect dam embankments from the constant abrasive force of wave action. Common product specifications include large-capacity baskets measuring 2.0 x 1.0 x 1.0 m or 3.0 x 1.0 x 1.0 m, which are constructed from 2.7 mm to 4.0 mm heavy-duty galvanized steel wire with an additional PVC coating for maximum underwater durability. The double-twisted hexagonal mesh, typically in 80 x 100 mm or 100 x 120 mm apertures, ensures the structure remains intact while allowing for essential water permeability.
Hydraulic Engineering and Erosion Mitigation
- Primary Application: Shoreline stabilization, wave dissipation, and embankment protection
- Core Product: Double-Twisted Hexagonal Mesh Gabions with PVC Coating
- The Challenge：The Reservoir, a primary water source for the region, suffered from significant perimeter erosion due to fluctuating water levels and persistent wave action. The existing earthen embankments were losing approximately 0.5 m of soil annually, threatening the structural integrity of the main dam and increasing sedimentation within the reservoir. A solution was required that could withstand constant water immersion while remaining permeable to eliminate hydrostatic pressure.
Technical Specifications and Material Selection
- Product: PVC Coated Galvanized Steel Gabion Baskets
- Mesh Type: Double-twisted hexagonal wire mesh (Type 80 x 100 mm)
- Core Wire Diameter: 2.7 mm (Hot-dipped galvanized steel)
- Finished Wire Diameter: 3.7 mm (Including 0.5 mm PVC coating)
- Unit Dimensions: Standard 2.0 x 1.0 x 1.0 m baskets for the base and 2.0 x 1.0 x 0.5 m units for the upper revetment
- Selvedge Wire: 3.4 mm (Core) / 4.4 mm (Finished)
- Lacing Wire: 2.2 mm (Core) / 3.2 mm (Finished)
Flexible Gabion Revetment System
The design featured a 350-meter long stepped gabion revetment. Unlike rigid concrete, the gabion system allowed for natural settlement without cracking. The permeability of the 80 x 100 mm mesh ensured that water could flow through the structure, preventing the buildup of pressure behind the wall during rapid reservoir drawdown.
Installation
- Foundation Preparation: The shoreline was graded to a 1:2 slope and lined with a 250g/m2 non-woven geotextile filter to prevent fine sediment loss.
- Base Layer Deployment: Heavy-duty 2.0 x 1.0 x 1.0 m units were placed at the toe of the slope to provide a solid foundation against underwater currents.
- Stone Selection: Durable, non-degradable basalt stones (size range 100 mm to 250 mm) were used to fill the baskets, ensuring high density and maximum weight.
- Connection and Lacing: All adjacent gabion units were continuously laced to create a monolithic, interconnected barrier along the entire 350-meter perimeter.
This Reservoir project demonstrates why 80 x 100 mm PVC coated gabions are the industry standard for hydraulic protection. By combining the strength of 2.7 mm steel wire with the flexibility of the double-twisted mesh, engineers achieved a sustainable, long-term solution for shoreline defense and water resource management.
