You can measure how much 1 inch of water is by setting a group of flat-bottomed cups at 5- to 10-foot intervals from the base of your sprinkler to the edge of its reach. Take note of the time an inch of water takes to fall in the cups. (NDSU photo)

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You can measure how much 1 inch of water is by setting a group of flat-bottomed cups at 5- to 10-foot intervals from the base of your sprinkler to the edge of its reach. Take note of the time an inch of water takes to fall in the cups. (NDSU photo)