I was invited to talk to Ph.D students at the 2019 Warredoc School on data rich Hydrology. This follows other more or less opinionated talks I give at the GEOframe Winter School, and complete them. In hindsight I actually scratched the surface of the topic. I would have made a more substantial contribution if I had added examples with GEOframe for clarifying "where do datasets integrate best in models". Never mind: there is then still matter for the next reflections and investigations.