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it would flow more easily through a narrow pipe
The open channel flow has a free or rather open surface whereas the pipe flow has a closed surface.
Water will flow more easily through a wide pipe than a narrow pipe. This is because a wider pipe offers less resistance to the flow, allowing a greater volume of water to pass through simultaneously. In contrast, a narrow pipe restricts the flow, creating higher pressure and turbulence, which can impede the movement of water. Therefore, the diameter of the pipe significantly affects the flow rate.
When a leak has occured in the pipe, or when there's to many twists and turns in the pipe, or when there's a blockage in the pipe.
about 70 bar (1000 PSI)