For some time TatukGIS has been working on a Hydrology Toolset. This
is coming soon feature arrived with version 11.54.0.
The following teaser images illustrate several operation steps: from raw DEM to vectorized rivers (with flow amounts) and drainage basins.
1. Original DEM
Step 2: Flow directions.
Step 3: Flow accumulation.
Step 4: Watershed.
Step 5: Stream order.
Step 6: Basins and Streams vectorized.
Data source: publicly available 100m Digital Elevation Model for area around Bytów county, Poland; Head Office of Geodesy and Cartography (GUGiK).