Because it is easily 'worked' - - it melts at relatively low temperatures, it is easily bent into almost any shape required, it is non-porous, it is almost inert (it doesn't react easily) and it is quite readily available.
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Most of the Romans aqueducts were underground conduits. They put the conduits on bridgework when they needed to cross a valley or when they needed to keep it at a gradient to keep the water flowing.
While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.While the Romans used aqueducts to supply water to their cities, they did not invent them. However they did perfect/or reinvent the syphon and pumps used to control the water.
The Romans used something called an aqueduct to bring in water from lakes to their city. Aqueducts are tubes that go through mountains are elevated above valleys with a very slight angle downward then entire time. The downward slope ensures that the water will flow without the need for any sort of pump.
The Romans did not ensure that the water from the aqueducts reached the city. The water did not come from the aqueducts. It came from the sources on the mountains. The aqueducts were what made the water reach the city. They were water conduits which carried the water. An incline was what made the water move. Down the sides of the mountains it was the slope which provided the incline. In flat areas the conduit was placed on bridgework which had a slight incline. Most of the aqueducts were underground conduits.
Romans aqueducts had arches when the water conduit was placed on top of arched bridgework. This was done when the aqueduct crossed a river or a valley or when a gradient was needed to keep a gradient to keep the water flowing in flat areas. Romans aqueducts consisted mostly of underground conduits.