Irrigator’s Formula

How many inches of water is a field receiving from irrigation?  To find out, use this formula:

GPM x Time

Acres x 452

1 acre inch = 27,154 gallons

452 gpm/hour =1 acre inch

1 acre foot =325,848 gallons


GPM = Flow rate (gallons per minute)

TIME = Length of irrigation in hours

ACRES = Number of acres irrigated per field or set