Hydraulic power = sgxHxQx9.81 in consistent units. Divide this by the efficiency of the pump and you should be quite close to the shaft power required to drive the pump.
I do not know what "hp value" means and not sure of you mixture of units (hp, m etc.)
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The shaft power required by any fluid mover is the pressure rise multiplied by the volumetric flowrate divided by the efficiency.
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