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The no fines concrete gravity wall. I have not seen that much here in the states. The flavor of the month for years now has been tensar grid on the public projects I have been involved with. It looks like a very solid installation though.
Is this the rainy season in Australia? Now in Oregon we are going into winter (rainy) and we now cover spoils piles and some excavations with plastic. I'm not sure by your photos if that would help in your case. Looks like the cutbanks failed due to water traveling through the ground and not just runoff.
Bugger is right!
good luck
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