Originally Posted by
Jim Andrew
You might check out the manufactured retaining wall blocks that the home centers are selling. You dig out a footing, fill the footing with crushed rock, and stack the blocks, filling on the backside with gravel. The gravel will let water through, so the wall is not pushed over by the weight of water.
Stacked manufactured block walls can be stand-alone, too. However, there is a height limit that is less than the 6 feet the OP is thinking about.
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The most expensive tool is the one you buy "cheaply" and often...