This question is related to Fixing Model with Iterate selected feature?
The answer provided by worked great, but it’s really slow. Any way to make it run faster?
My Points Shapefile contain 6707 features and my Flow direction raster is calculated from the SRTM (250m resolution). My data is in GCS in the WGS84 datum.
arcpy
calls work by doing the export as python script from model builder. Look through the .py file with your favorite text editor (ex. Notepad not Word) and get an idea of what is happening behind the scenes. It can be helpful getting your flow down to script form. Get an idea of the python basics first like a loop, function, and how indentation works. You should be able to pick up what's happening by the names of thearcpy.
TOOLNAME/TOOLBOX/OTHERINFO` parts.