There's not a lot of ...

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There's not a lot of specialized work on this issue. Most setbacks are based on local hydrology and rainfall patterns to ensure fecal material is not transported to the river during rainfall. Standard animal feedlot setbacks in the US are 100-300 m. These seem relevant. Many sewage treatment plants are much closer to the edge of the water, but require internal recycling of drainage water so that there are no untreated direct releases.