Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

length and diameter are same in two systems
head loss and discharge are same in two systems
friction factor and length are same in two systems
length of pipe and discharge are same in two systems

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Hydraulics & Fluid Mechanics
Non uniform flow occurs when

velocity, depth, pressure, etc. change from point to point in the fluid flow
the direction and magnitude of the velocity at all points are identical
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

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