Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

ratio of inertial force to force due to surface tension
ratio of inertial force to force due to gravitation
all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
ratio of inertial force to force due to viscosity

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

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

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