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Notes -
Is it a dammed stream, or does it just collect runoff? If it's the latter, it will be filthy no matter what you do. Geotextile + a truckload of pebbles is the usual approach.
It's spring fed, but also collects runoff.
If it's spring-fed, then covering the bottom with geotextile is a bad idea. I would go with pebbles/sand, plus a secondary gravel-filled ditch for filtering runoff
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