An abbreviation for gallons per day, a measurement of total water or liquid volume used or produced in a single day.
From English 'gallons' + 'per' + 'day'; emerged as standard notation in 20th-century engineering and municipal water management.
A single leaky toilet can waste 200+ gpd—enough to fill an Olympic swimming pool over a year—which is why water companies obsess over detecting tiny leaks.
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