An abbreviation for gallons per capita per day, a measurement of how much water each person uses daily.
From English 'gallons' + 'per' + 'capita' (Latin for 'per head') + 'day'; created in the 20th century by water management scientists.
The average American uses about 80-100 gpcd, but this number varies wildly by region—desert cities use far less than water-rich areas, revealing hidden patterns in how geography shapes our resource consumption.
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