Here are the slides for my talk Upstream/Downstream: Discovering and Displaying Watershed Topology
from !!Con 2016:
Here's a link to the little video snippet I showed during the talk
using Google Earth to show a 3D closeup view of a few of the watershed
regions in the mountains where you can easily see how water flows from
one into the next:
The application itself is online here:
My contact info is on the last slide in the PDF above, if you have any questions!