Choosing Right Pump

Properly sizing an irrigation pump involves measuring your water source pressure (psi) against the flow (gph) and pressure (feet of head) requirements of your watering system and selecting the pump that will most efficiently connect the former to the latter.
There are a number of on-line tutorials available to those interested in designing a basic irrigation system that is compatible with local water resources. Professional irrigation services are an option for applications with complex requirements. When it comes to selecting the pump at the center of the equation, pump curves are a good place to start.
Pump curves are issued by pump manufacturers to illustrate a pump's performance over a range of pressures and flows in feet of head and psi.
The shape of a pump curve varies according a pump's design. Pump efficiency is maximal at a particular combination of discharge and head and then drops below the maximum as the discharge rate increases.
The objective is to select the pump with highest efficiency at the flow rate and pressure conditions required by your system.
As a general rule, pumps with electric motors are driven at either 1750 or 3500 rpm (½ to 2 hp). Models driven at 1750 rpm are capable of lower head but higher discharge than those driven at 3500 rpm.
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