How did ancient roman fountains spray water?

Question

How did ancient roman fountains spray water?

Answer 1

They were fed from a reservoir higher than the fountain, often at some distance.  Hydraulic pressure caused the fountains to spray.  Most fountains up to the 20th century operated on similar principles.

Answer 2

It was done with gravity and pressure. As the water pressure heading down hill was more than what was needed to push it uphill and out of the fountains.

Answer 3

How did public fountains, like those in Rome, work without any type of motor to pump the water?

Ancient Rome received all of its water (according to Encarta, about 38 million gallons a day) through a system of aqueducts. All water flowed to the city by gravity, but because it was arriving from surrounding hills, it could be stored in large cisterns very similar in concept to today's water towers (the main difference is that cisterns are filled from the top).

Water flowed from the cisterns either through pipes to individual houses or to public distribution points. Fountains served both decorative and functional purposes, since people could bring their buckets to the fountain to collect water. The cisterns provided the height needed to generate water pressure for the fountains to spray. As discussed in How Water Towers Work, a foot of height generates 0.43 pounds per square inch (psi) of water pressure, so a cistern does not have to be that tall to develop enough pressure to give a fountain a reasonable display.

Answer 4

Gravity and pressure. Only a small incline is necessary to create enough pressure necessary to have water shoot out.  

Answer 5

By gravitational forces and a series of cisterns.