These aqueducts were used to bring water from the mountains to the city using the force of gravity! The Romans once again are pretty smart! They also knew that the aqueducts were made out of concrete so they would only repair the aqueducts between the months of April and November because of the temperature effecting the concrete! They had 77 aqueducts in Rome, all together they brought 350,000,000 gallons of water into the city per day! Each one had a 1/2 inch grade change per mile, that allowed the water to build up momentum over the miles and create pressurized water!
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