Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Length of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Loss of head and discharge of both the pipes is same
Diameter of both the pipes is same

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Hydraulics and Fluid Mechanics in ME
Two dimensional flows occurs when

The direction and magnitude of the velocity at all points are identical
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The magnitude and direction of the velocity do not change from point to point in the fluid
The velocity of successive fluid particles, at any point, is the same at successive periods of time

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