Hydraulics and Fluid Mechanics in ME
The flow in a pipe or channel is said to be uniform when

The liquid particles at different sections have different velocities
Each liquid particle has a definite path
The quantity of liquid flowing per second is constant
The liquid particles at all sections have the same velocities

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The available head of liquid is less than 5 times the height of orifice
The velocity of flow is large
The size of orifice is large
The available head of liquid is more than 5 times the height of orifice

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