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Given two datasets 1) polygons for global river basins and 2) points for global hydro power dams; how can I determine the upstream basins for each dam?

Not sure where to start with this, looking for suggestions. I think I might need to find a river data set that can be used to find all branches up-stream of a given point then use that to select or id the basins?

Student I'm helping is working in ArcGIS Desktop, 10.5.1.

closed as too broad by PolyGeo Oct 10 '18 at 4:22

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • I recommend not thinking about GIS SE as being an online GIS tutor. For your questions to be answered here they should as much as possible describe not just what you want to do, but precisely what you have tried and where you are stuck trying that. Asking for ideas in the GIS Chat Room is always fine to do. – PolyGeo Aug 5 '18 at 21:23
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As you have tagged your question as arcgis I suggest you read the help file...

There is a good introduction to the steps in hydrological analysis that you will want to be using.

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