Might be helpful to show the excerpt of the Bernoulli equation that you probably got this from initially:
V = SQRT( 2 * g * TSH)
Where SQRT is "Square Root of"
g = acceleration of gravity, 9.8 m/sec^2 or 32.2 ft/sec^2
TSH = total static head, aka pump head
Note also that this only applies for accelerating fluid that is initially stationary, such as when the pump is drawing water from a reservoir. You can get faster velocities with an in-line system since the water doesn't have to be accelerated, it just has to overcome friction.
Where did you get the "50% to 70%" value?
Alchemy
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