- 1). Position the 5-gallon bucket beneath the faucet. Buckets with marks on the side indicating the volume are available from most hardware stores.
- 2). Turn the water on at the same time as you activate the stopwatch. Stop the watch when the water level reaches the 5-gallon mark.
- 3). Multiply the minutes by 60 and add to the seconds portion of the time measurement to determine the total number of seconds that passed while filling the bucket.
- 4). Divide the total seconds by 5 and then again by 60 to arrive at the GPM calculation.
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