After seeing the design for this berm, I actually had to apologize to @UtahJoe for questioning his driveway ramp design.December 15: Berm Update
It was a splendid late fall day today, and instead of riding my bike somewhere I spent some time working on the outline of the wooden berm. Since the last picture, I've actually done nothing at all. I adjusted the angles of all 8 pairs and added some string to give a visual on how it'll line up. I don't really like how it's coming together so far. It's close, but something doesn't work for me with this - yet. I intended to angle the boards at 30-35-40-45 then 45-40-35-30 but when I tried to fix the 45 degree angles, it started to topple over. So I made the inner 6 all 35 degrees and the ends just 30. It sort of lays out ok, but I'm not sure what I'll end up doing here. I knew I needed to move the 8x8s, but I think I need to do that sooner than later. This is all a bit more of an enigma than I suspected, but I'm taking the long road to get there.
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I was curious where this design came from and found a video and assume it is this:
The issue as i see it is this design is essentially framing “tic tac toe” boxes and playing with the angle. The high side and low side are what actually supports the top boards. Your design appears to have nothing than will support weight.
Possibly re-start by building 4’ x 4’ “tic tac toe” frames, for every other section snd then connect those with an offset board.
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