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## Main Question or Discussion Point

I'm working on a fluid flow problem that doesn't seem very complex but the solution is eluding me at the moment. Given a length of smooth tubing of known ID and roughness with water running through it, is it possible to predict at what velocity the flow will transition from "pipe" flow (fully wetted perimeter) to "open channel" flow (less than fully wetted perimeter with some open surface)?

Any assistance is appreciated.

Any assistance is appreciated.