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I mean, its a reasonably well defined term?
"able to be maintained at a certain rate or level."
You can modify it beyond that as it specifically pertains to trails, but I think its colloquially fairly well understood. As Karen meant it "this trail will be generally the same, and not become a giant creek, as long as I'm around".
Or you could get way more detailed and lay out a Limits of Acceptable Change framework?
I hear what you're saying to a degree, trails have impact on the environment by their very definition. But that doesn't mean they can't be "sustainable" in the short or long term.
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