My well pumps 108 litres per minute, I don't necessarily need that much water flow - How do I determine what water flow I need?

Hi,

My well can pump 35 gallons or 108 liters per minute. I want to pump water from the well but I don't necessarily need that much water flow. At full capacity, in a three inch line, pumping 20 meters, what is the maximum capacity flow of the water line?

Can I use this number to determine the hp needed of the water pump?

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