23 (+1) unsolved questions in hydrology

23 (+1) unsolved questions in hydrology

Contributed by Bettina Schaefli Have you heard about the “23 unsolved problems” initiative of IAHS, in reference to the 23 unsolved problems of Hilbert? After the launch of this initiative in November 2017, the web-based discussion culminated in a round of brainstorming at EGU 2018 and in a voting process at the Vienna Catchment Science Symposium. Personally, I did not contribute any question at the discussion stage. I simply could not think of a question that relates to observed phenomena,…

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