How to Call ArcHydro Tools in Stand Alone Python Script

Question

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?

• jbosq: 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.

Answer 1

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.

Answer 2

You can import Archydro like any other module

import ArcHydroTools

Then you can access functions like

ArcHydroTools.CatchmentPolyProcessing(...)

• mlt: Note that for standalone scripts one has to add C:\Program Files (x86)\ESRI\WaterUtils\ArcHydro\bin to PYTHONPATH besides everything else.

Answer 3

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')
arcpy.ImportToolbox(toolbox)
arcpy.LevelDEM_archydropy(Input_Raw_DEM_Raster="demfixed",
 Input_Lake_Feature_Class="watbody.shp",
 Output_Level_DEM_Raster="D:/leveldem")

• mlt: "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.