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Aqueduct (bridge)
Bridges for conveying water, called aqueducts or water bridges are constructed to convey watercourses across gaps such as valleys or ravines. The term ''aqueduct'' may also be used to refer to the entire watercourse, as well as the bridge.〔"aqueduct", Britannica CD 2000〕 Large navigable aqueducts are used as transport links for boats or ships. Aqueducts must span a crossing at the same level as the watercourses on each end. The word is derived from the Latin ''ラテン語:aqua'' ("water") and ''ラテン語:ducere'' ("to lead").〔"aqueduct", Britannica CD 2000〕 A modern version of an aqueduct is a pipeline bridge.
==Ancient bridges for water==
Although particularly associated with the Romans, aqueducts were used as early as the 7th century BCE, when the Assyrians built an 80 km long limestone aqueduct, which included a 10 m high section to cross a 300 m wide valley, to carry water to their capital city, Nineveh.〔(Thorkild Jacobsen and Seton Lloyd, Sennacherib's Aqueduct at Jerwan, Oriental Institute Publication 24 ), University of Chicago Press, 1935]〕
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