Million gallons per day (Mgal/d) This report converts annual volumes of water into average daily quantities in million gallons per day (Mgal/d), because annual volumes of water often involve large numbers. To help visualize this amount, one million gallons would form a cube that is approximately 51 feet on each side. To put water use in perspective, the typical person may use 2 to 7 gallons to flush a toilet, 25 to 50 gallons to take an average 5-minute shower, or use 9 to 12 gallons to wash dishes with an automatic dishwasher or 20 gallons to wash dishes by hand (U.S. Environmental Protection Agency, 1995).
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