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Need to aggregate to HUC8

The data (total N and P) is organized by ComID.

Therefore, we need to add up the value of comID to the HUC8 that comIDs are belong to. 



  • Derive a relationship table between (catchment (COMID) and HUC8) from crosswalk data above
  • calculate (add up) the total N and P value by huc8 by using table above
  • join the table above (calcualted table) with HUC8 boundary

2002 Nutrient Model Results by SPARROW