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Why do streams respond so quickly when storm flow is so old?
Explain why streams react within hours of rain although storm runoff is largely old water, and how long water takes to cross catchments.
| 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`. |