Hydraulics & Fluid Mechanics
Non uniform flow occurs when

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

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Hydraulics & Fluid Mechanics
The normal stress is same in all directions at a point in a fluid

only when the fluid is frictionless
irrespective of the motion of one fluid layer relative to an adjacent layer
When there is no motion of one fluid layer relative to an adjacent layer
only when the fluid is incompressible and has zero viscosity

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