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calculate percent of total area for polygons in a shapefile

Question asked by resslerd on Jul 29, 2016
Latest reply on Jul 29, 2016 by cdspatial

I have a feature class of soils polygons, and a feature class of watershed boundaries.  I want to calculate the percent area of total for each soil type (from the attribute table) in each watershed boundary.  I can calculate the area for each soil, but I need a workflow in python or model builder (there are 2000 watersheds, and I cannot "right click the field in the attribute table and "jot down" the sum from the statistics dropdown").  Which tool can summarize all the area in a shapefile and add that value to each record in that shapefile?