Watershed API

[ak_gis]

Does anyone here have experience using Esri's watershed API? Watershed—ArcGIS REST API: Elevation Analysis services | ArcGIS for Developers 

It seems no matter what I pass to sourceDatabse, the GP service always returns result in 90m HydroSHEDS.  30m source data is available for the entire US (according to the source map), but whether I pass "FINEST" or "30m" as desired source data, it gives me the 90m result when I test within the state of Virginia.   

Here is Esri's sample code I have been playing with: dcgull.github.io/Watershed at master · moiAK/dcgull.github.io · GitHub  I would appreciate tips and insights from you seasoned developers