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Port d’Envalira slopes are protected against erosion

erosion control_macmat

Our erosion geomat MacMat® successfully promoted revegetation

The problem of slope superficial instability at the Port d’Envalira mountain pass in Andorra has been solved thanks to our MacMat® geomat for erosion control. This innovative product provides an environment that enhances the growth of vegetation through the mat. One year after installation, the slope is successfully revegetated.

Port of Envalira is a mountain pass and the highest paved road in the Pyrenees at an elevation of 2,409 m above sea level. It is located in Andorra, between the towns of Soldeu and El Pas de la Casa. Together with the Envalira tunnel, this mountain pass is the only access point from Andorra to France.

Significant rain and snowfall generated slope erosion and superficial instability and our geomat MacMat® R was chosen to secure the slope and prevent surface erosion from run-off.

MacMat® is a three-dimensional matrix of UV stabilized, non-degradable synthetic fibres, heat bonded where they cross. It is used for long-term erosion protection applications and it immediately increases the soil’s resistance to erosion by providing an environment that enhances the growth of vegetation through the mat. The long term performance of the vegetation is also enhanced, as the MacMat® R reinforces the root system of the vegetation, anchoring it in these fragile and vulnerable soils.

For this project, we provided two types of reinforced geomats:

  • 5,200 m² of MacMat® R 020, reinforced with geogrids
  • 900 m² of MacMat® R 8127 GN, reinforced with double-twisted steel woven mesh.

Both geomats are green in colour for a lower environmental impact. The picture shows the slope one year after the work was completed and the benefits of the MacMat® are clear.

For more information, please contact us.

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