The scientific paper "Twenty-three unsolved problems in hydrology (UPH) – a community perspective" is available here.
The paper is open access and therefore it can be freely downloaded. It presents a community effort to identify research questions for the hydrological community. They have been identified with a community endeavor. Of course these questions are far from being exhaustive, but they provide a very good picture of current emerging issues.
Thank you for your interest.
Best,
Alberto
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