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 (for wipers):
Irrigation Application 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)



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