Irrigation Pump Selection Calculator

Calculate required pump horsepower from total dynamic head and flow rate using Hazen-Williams friction loss.

Required flow (GPM)

Static lift (ft)

Operating pressure (PSI)

Pipe length (ft)

Pipe diameter (in)

Hazen-Williams C

Pump efficiency (%)

Energy cost ($/kWh)

Annual run hours

Tab to move between fields

Total Dynamic Head (ft)

112.4

Recommended motor (HP)

Friction loss (ft)0

Water horsepower1.42

Brake horsepower2.03

Pipe velocity (ft/s)2.27

Annual energy cost ($)$272

How to Use This Calculator

Enter required flow rate in GPM and static lift in feet from source to highest point.
Set operating pressure in PSI at the sprinkler or emitter and mainline pipe length in feet.
Enter pipe diameter in inches and Hazen-Williams C factor for your pipe material.
Set pump efficiency (%) and annual run hours for energy cost estimation.
Review Total Dynamic Head (ft), Recommended motor (HP), and Annual energy cost ($) to select the right pump.

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