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I have seen less holding back more, but concrete posts and gravel boards are not a proper retaining wall, although they might hold (or not). If you want a permanent fix, I would go with 9" hollow blocks on a concrete foundation, with the voids in the blocks filled with wet concrete to form a solid concrete wall. I will try to calculate material costs tomorrow.
ColinTheBald
@stevo_com
If I concrete these posts down 2 feet below the height of the concrete then double stack the gravel boards, that will give me another two feet of height. I reckon that would be enough. Is this a terrible idea?
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