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Dear Ponnu Subramanian,

You can calculate the HP HP/Pump Efficiency

[Total Head (for Submersible Pump) = Total Delivery Head = Pumping Water Level below Ground level + Delivery Head above ground level]
of submersible pump as 'BHP of Pump' as follows:

Water Horse Power (WHP) = Discharge (lt/sec.)X Total Head (m) / 76
Break Horse Power (BHP) = Water

[Note: Suction Head = 0, for submersible pump Pumping Water Level below groundwater level = water level below ground level (before pumping) + Steady State Drawdown (during pumping)]

Thanking you,

S. Halder
Assistant Engineer (Agri- Irri)
Water Investigation & Development Department
Government of West Bengal


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