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 velocity of successive fluid particles, at any point, is the same at successive periods of time
The magnitude and direction of the velocity do not change from point to point in the fluid

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

All of these
To regulate flow of water to turbines by providing necessary retarding head of water
To eliminate water hammer possibilities
To control the pressure variations due to rapid changes in the pipe line flow

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