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I'm using HydroSHEDS watersheds shapefiles for a proyect. Watershed are delinated applying the rules of Pfafstetter codification.

I need to merge/union the different polygons in a same shapefile. I need to select values for 2 different colums (values are the same, one is the HYBAS_ID and the other is the NEXT_DOWN) in the table of attributes, that way I can contruct the upstream basin. Also I need to keep some attributes and also sum others.

I'm using ArcGis 10.3.

Any idea in how can I do this?

Table of attributes

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    Dissolve on HYBAS_ID and NEXT_DOWN. Then use a spatial join to pull in the attributes (set your merge rules for each field to specify sum or whatever you want) – jbalk Aug 29 '17 at 4:48
  • I too am interested in the best way to do this. Merging by NEXT_DOWN can identify numerous sub-watersheds in some cases (e.g., all watersheds surrounding and draining into a large lake). Other suggestions on how to associate hydrobasins sub-watersheds with their larger parent watershed, without jumping all the way up to the highest, most general hydrobasin watershed boundaries? This can be done manually by adding a more general hydrobasins layer and selecting by location, but it seems in the attribute code there must be a way to achieve similar results? – Dan Feb 24 '18 at 21:59

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