Irrigation in the Pacific Northwest

System Pumping Requirements

Use this form to calculate the system capacity (flow rate) required to meet the demands of a field.

Learn more about the units used on this page.

Net Application Required Per Week:
Total Area:
Total Hours Available to Operate per Day:
Total Days Available to Operate per Week:
days per week
Irrigation Efficiency:
Total Flow Required to Operate System:



The Equation

This calculator uses this formula to determine the system pumping requirements of a field.


= Total flow rate required to operate irrigation system (gpm)

= The net application required per week (in)

= Total area to be irrigated (acres)

= Total hours available to operate per day (hrs)

= Total days available to operate each week (days)

= Efficiency of the irrigation system (as a deciaml)



WSU Prosser - IAREC, 24106 N Bunn Rd, Prosser WA 99350-8694, 509-786-2226,