When it comes to protecting rivers, canals, and slopes from erosion, riprap—or conventional rock placement—has historically been one of the most widely used solutions.

Their operation is based primarily on placing rocks that are large and heavy enough to withstand the forces generated by the flow. However, as flow velocities, hydraulic stresses, and scouring increase, the size and weight of the required rocks may also increase significantly.

This poses significant challenges: larger volumes of material, transportation difficulties, limited availability of large-diameter rock, and higher construction costs.

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Image 1: Masonry and Conventional Rip-Rap Channels

Given this scenario, geosynthetic-confined rockfill mats offer an alternative that allows for more efficient use of available materials.

Rip-Rap vs. Confined Rockfill: What's the Difference?

Rip-Rap

Rock → individual stability

Rockfill Mats

Rock and gravel confined in geogrid → stability depending on the size of the module or cushion

Greater weight and stability by using smaller rocks

Hidromalla contains granular material and allows for the construction of large-scale, high-mass structures.

This is particularly interesting when:

  • Large-diameter rock is not available near the project site.
  • Transporting large blocks increases costs.
  • Smaller-sized granular material is available.
  • Large-volume protection units are required.
  • Site conditions make it difficult to handle heavy rocks.

Hydraulic performance: the system operates as a single unit

In hydraulic protection, the goal is not simply to place material on the ground.

The goal is to prevent the flow from causing:

  • Lateral erosion
  • Detachment and Transport of Material
  • Progressive erosion
  • Structural instability.

Hydromesh-reinforced rockfill mattresses are flexible linings that conform to the terrain's geometry.

This characteristic is particularly important in rivers and canals where sedimentation, deformation, or changes in the geometry of the riverbed and banks may occur.

In addition, they are porous materials that promote the dissipation of flow energy and integration with the surrounding environment.

Less environmental impact: less rock, less transportation, and greater integration

The environmental impact of a water-related project does not depend solely on the materials used.

The following should also be considered:

  • Required rock volume
  • Transport distance
  • Quarrying
  • Used Machinery
  • Earthwork

The real cost lies in the installed solution

The proper comparison should be based on the total installed cost.

Conventional Rip-Rap

Large-diameter rock + transportation + sorting + equipment + placement + filter + site preparation

Rockfill cushion

Geogrid + granular material + cushion formation + installation + supplementary components

When suitable granular material is available near the construction site, reducing the size of the rock can present an opportunity to optimize transportation, handling, and construction costs.

Solutions for Different Hydraulic Conditions

Not all projects require the same type of protection. For this reason, geomatrix It offers a variety of solutions to address the specific conditions of each construction project.

Rockfill mattress enclosed in Hidromalla:

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Image 2: Large-Scale Protection Using a Confined Rockfill Embankment

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Image 3: Granular Containment and Environmental Integration

Articulated concrete block system:

This type of system is built using a textile formwork that creates interlocking concrete blocks that articulate to adapt to the contours of the terrain.

It is an alternative for hydraulic linings where protection against erosion is required and where ground deformation or settlement may occur.

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Image 4: Installation of Articulated Colchacreto

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Figure 5: Long-Term Concrete Mattress, Ecological Adaptation, and Structural Stability

Textile reinforcement with high-performance geosynthetics:

For conditions where the structure requires additional protection against impact, abrasion, and hydraulic action, solutions such as high-strength textile reinforcement are available.

It can be used as part of protective and cladding systems, depending on the specific conditions of the project.

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Figure 6: High-Performance Geosynthetics on Construction Sites

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Figure 7:Resilient and Sustainable Hydraulic Protection