I am currently using ArcGIS ArcHydro tools to perform 'Catchment Polygon Processing'.

However, it is proving time consuming to perform this for multiple rasters. How might a write a python script to import ArcHydro tools?

  • 1
    Are you just looking for: arcpy.CatchmentPolyProcessing_archydro()? What versions are you using? Do you have the script started? See if the python automation slides here answer any of your questions.
    – jbosq
    Commented Apr 5, 2016 at 17:27

3 Answers 3


I've discovered there is an ArcHydro Tools Python toolbox which is installed in the ArcHydro Set-up. C:\Program Files (x86)\ArcGIS\Desktop10.2\ArcToolbox\Toolboxes

This covers most ArcHydro tools contained in the main interface.


You can import Archydro like any other module

import ArcHydroTools

Then you can access functions like

  • 1
    Note that for standalone scripts one has to add C:\Program Files (x86)\ESRI\WaterUtils\ArcHydro\bin to PYTHONPATH besides everything else.
    – mlt
    Commented Dec 1, 2017 at 18:01

Like Richard G suggested, the toolbox is the way to go. I had nothing but trouble trying to import functions via:

import ArcHydroTools

An example:

import arcpy
toolbox = ('C:/Program Files (x86)/ArcGIS/Desktop10.3/ArcToolbox'
           '/Toolboxes/Arc Hydro Tools Python')
  • "nothing but trouble" is not a good description of a problem. You don't need to import toolbox nor ArcHydroTools. If you'd like to use arcpy style calls, you'd want arcpy.gp.DEMReconditioning_archydro (tested with ArcGIS 10.5). P.S. I believe Richard suggested archydropy instead of archydro.
    – mlt
    Commented Dec 1, 2017 at 18:29

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