I'm getting ready to make an on-contour hugelkulture bed with upslope swale, so I've been looking for a quick and easy way to mark contours. One of the best guides I've found is Hesperian's
Community Guide to Environmental Health. The linked page not only describes how make the A-frame level using just sticks, string, rocks, and (optionally) nails and maybe a bottle, but also where and how to make contour barriers to prevent erosion.
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