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Answer: It is a water supply or navigable channel (conduit) constructed to convey water. The term applies to any bridge or viaduct that transports water instead of a path, road or railway across a gap. The word is derived from the Latin aqua ("water") and ducere ("to lead"). Although particularly associated with the Romans, aqueducts were devised much earlier in the Near East and Indian subcontinent, where peoples such as the Egyptians and Harappans built sophisticated irrigation systems. Roman-style aqueducts were used as early as the 7th century BC, when the Assyrians built an 80 km long limestone aqueduct, 10 m high and 300 m wide, to carry water across a valley to their capital city, Nineveh.
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