Hi,
I'm the author of the Learn ArcGIS Cloudburst exercise, but what's available there is the first component, only, of a series of steps to estimate where and how much stormwater accumulates on terrain when asuming Horton flow conditions. At the Esri UC 2017 I presented a paper on the next steps: http://proceedings.esri.com/library/userconf/proc17/papers/2250_701.pdf . Let me know if this points in the right direction.
So far my workflow is implemented in Desktop, only, as I'm using the Geometric Network component not available in Pro. Apparently, a new Pro extension (Utility Network Analyst) will have the tools necessary in the future to programme a similar custom trace tool as mentioned in my presentation.
Kind regards,
Thomas Balstroem, Assoc.Prof.
Dept. of Geoscience, Univ. of Copenhagen, Denmark
tb@ign.ku.dk