How many gallons of water does it take to cover 1 acre of land with 1 inch of water?

Q: How much water is required to irrigate 1 acre of land with 1 inch of water?

A: It takes 27,154 gallons of water to irrigate one acre of land with an inch of water. This measurement is useful when you need to water one or more acres and need to evaluate whether your current flow rate is adequate for getting it done according to your schedule.