I READ with disbelief that galvanised wired gabion is being used for long-term river protection work, as published in the article Reviving a river (Ecowatch, May 29).
The wired cage is not suitable as a long-term solution for river bank protection as the durability of the cage depends on the thickness of the galvanisation.
Typically, the wired cage has a weight of coating of about 250g/sqm, which is too thin for long-term stability. The protective life of the coating is about 10 years.
The maintenance or replacement cost of this system is extremely expensive.