Calculate no of stages required for the borewell

Hello Everyone,

Kindly help me in deciding the no of stages required for the below borewell:

Borewell depth: 910 ft; Planning to install Motor at 800ft; I got permisssion to install 7.5 hp motor.

So, how to calculate the no of stages required. Kindly help me. Thanks, Sivamoorthy.

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