Hydraulics and Fluid Mechanics in ME
Mach number is significant in

full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
all of fhe above
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
supersonics, as with projectiles and jet propulsion

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

All of these
To eliminate water hammer possibilities
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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