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I do not know how relevant this is to what you need. I have a video and write up (attached) of an activity I designed for measuring soil texture. Even though the activity does is not done outdoors (but you go there to get the samples) and does not directly measure erosion, it does measure run off activity, which is directly proportional to erosion.
https://www.youtube.com/watch?v=JigmCxM6Z1s
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