I want to level my garden as it drops away badly at the bottom. Can I put 4 12" concrete gravel boards and back fill to them or is this a bad idea? I will actually put a 3ft fence on top and use 11ft concrete posts so 4ft in the ground.
The length will be about 40 meters so it will take many tons to backfill and I do not want to be digging it back out later.
Thanks...