You are thinking of an above the ground aqueduct. They were, in effect, a bridge for a water pipe.
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(Roman) Aquaducts.
An Aqueduct is a Roman Structure built to transport water from the mountains to the city in ancient Rome
She made an aqueduct to transport water to her model village.
The Roman engineers built aqueducts to transport water to where it was needed.
Until the rise of rail transport, by far the cheapest form of transport was by water - rivers, canals, lakes and seas.