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Old Croton Aqueduct
aqueducts were built, tunnels dug, piping laid, and reservoirs created. The gravity-fed aqueduct dropped 13 inches per mile, 1/4" per 100' (~0.02%). An elliptical tube, 8.5 feet (2.6m) high by 7.5 feet (2.3m) wide, of iron piping encased in brick