Based on a 310' well, 60' to house, a 1/2 HP pump, a 1" diameter pipe
from pump to holding tank and I want a flow rate of 12GPM. What is
the formula to calculate this? I need to input into an excel
Are you pumping to a open tank or to a pressurized system?
In either case, you will need to calculate total dynamic head per required flow
select the pump. The pump manufacturers furnish pressure/flow curves that show
flow at various pressures.
For pump curve examples and an explanation of pump selection process see:
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