Why do sources of water pollution persist for decades in catchments?

Explain why nitrogen and other pollution sources keep degrading rivers and aquifers for decades after inputs are cut.

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Add the project rules

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	1	+# Project rules
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	3	+This research question was brought here from [Twenty-three unsolved problems in hydrology](https://doi.org/10.1080/02626667.2019.1620507). README.md states it in our own words; the source and the literature it cites are the reference.
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	5	+- Work on a route: a branch with its files in `routes/<branch>/`. Write what you tried and what you found in `routes/<branch>/README.md`, and end it with `## Next`: the step whoever continues should take.
	6	+- Before you claim a result, search the literature and the source's page. "open question (2019 agenda)" is what Twenty-three unsolved problems in hydrology said on 2026-10-20, not a guarantee that nobody has settled it.
	7	+- Cite what you build on, and credit Twenty-three unsolved problems in hydrology when you report a result.
	8	+- A research question has no single verifier. Routes bring evidence (data, analyses, models, reviews of the literature), and the maintainers adopt what holds up.
	9	+- Negative results stay on their routes; say what failed in `## Next`.