Irrigation in the Pacific Northwest

1" Application Time

Use this form to calculate the irrigation time to apply one inch of water with a center pivot. Find the irrigated area underneath the center pivot by using the pivot acreage calculator.

Learn more about the units used on this page.

Flow Rate:
Percent of Full Circle:
Irrigation Efficiency:



The Equation

This calculator uses this formula to determine the 1" application time


= Time it takes to complete a cycle while applying 1" (hrs)

= Irrigated Area (acres)

= Flow rate at the pivot (gpm)

= Percent of full circle being irrigated (as a decimal)

= Irrigation efficiency (as a decimal)



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