Hydraulics and Fluid Mechanics in ME
The specific speed of a hydraulic turbine depends upon

Speed, power developed and head of water
Speed and head of water
Speed and power developed
Discharge and power developed

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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
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
ratio of inertial force to force due to gravitation

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