Huallalolén, Seca and Ñilhue ravines

Camino a Farellones, Lo Barnechea, Santiago, RM, Chile
Directorate of Hydraulic Works DOH
Other participating companies
Pucará S.A.
Protected object
Road, Residential area, Infrastructure
System height
4.0 m, 6.0 m
System length
10 m - 20 m
Corrosion protection
Number of barriers
Retention capacity
6900 m³
Initial situation

End of January 2021, the metropolitan area of Santiago endured heavy rainfalls of more than 116 mm. A phenomenon that had not occurred since 1933. This, plus the scarce vegetation in the mountains and a zero isotherm above 3,500 meters, activated several streams and gullies.

In the commune of Lo Barnechea the water affected homes, streets, roads, and infrastructure and caused emergency works.


The solution consists of seven dynamic barriers of the VX-type installed in the three streams affected mainly by the floods.

  • Seca gully: 1 VX-80-H4 barrier 16 meters wide and 4 meters high
  • Ñilhue gully: 1 VX-160-H6 barrier 13 meters wide and 6 meters high and 2 VX-140-H4 barriers 12 meters wide and 4 meters high
  • Huallalolén gully: 3 VX-140-H4 barriers 18 meters wide and 4 meters high

The retention capacity of all seven ring net barriers is 6’900 m³.

Your local contact

Roger Moor
Roger Moor
Country Manager Ost- und Zentralschweiz, Liechtenstein
Natural Hazards, Coastal Erosion Protection, Mining / Tunnels
Geobrugg AG
Aachstrasse 11
8590 Romanshorn / Switzerland
René Müller
René Müller
Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS
Natural Hazards, Mining / Tunnels
Geobrugg AG
Industriestrasse 21
5200 Brugg / Switzerland
Isacco Toffoletto
Isacco Toffoletto
Ticino Country Manager
Natural Hazards, Mining / Tunnels
Geobrugg AG Ticino
Stabile Cometal, via Pizzante 7
6595 Riazzino / Switzerland