Linked from
The 10 pages that link to Open-channel flow, each with the reason it gives.
Froude numberNarrower topic: The Froude number classifies its gravity-driven flow regimes.
Hydraulic jumpNarrower topic: Hydraulic jumps are transitions within this kind of flow.
HydraulicsRelated: It applies hydraulic analysis to waterways rather than enclosed pipes.
StreamflowNarrower topic: Natural streams are a major setting for this broader type of flow.