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((Unreferenced|date=December 2009))
((Notability|date=October 2022))
'''Water tunnels''' are tunnels (below-ground channels) used to transport water to areas with large populations or agriculture. They are frequently part of [[aqueduct (water supply)|aqueducts]]. Some aqueducts, such as the [[Delaware Aqueduct]] are single long tunnels. In other cases, such as the [[San Jacinto Tunnel]] on the [[Colorado River Aqueduct]], water tunnels form parts of far longer aqueducts.  In cases where the outflow of a water tunnel is into an existing stream or river flowing to the point of water use, the term aqueduct is less likely to be used, as with the Harold D. Roberts Tunnel from [[Dillon Reservoir]] to the [[North Fork South Platte River]].

==Notable water tunnels, or systems including water tunnels==
*[[Alva B. Adams Tunnel]] from the western slope of the [[Colorado River]] drainage to the eastern [[Front Range]] of Colorado, ((Convert|13.1|mi|km))
*[[Angeles Tunnel]] 7.2 mile (11.6&nbsp;km)
*[[Bagur Navile Tunnel]] 6 miles (9.7 km)
*[[Bosporus Water Tunnel]] ((convert|5.5|km|order=flip))
*Chicago [[Tunnel and Reservoir Plan]] 109.4 miles (176.1 km)
*[[Denver Water]]
**[[Moffat Tunnel]] 6.2 miles (10.0&nbsp;km)
**Harold D. Roberts Tunnel from [[Dillon Reservoir]] 23.3 miles (37.5&nbsp;km)
*Dingshan Tunnel on the [[Irtysh–Karamay–Ürümqi Canal]] (China) 4.6 miles 7.4&nbsp;km
*[[Metropolitan Water District of Southern California]]
**[[San Jacinto Tunnel]] on the [[Colorado River Aqueduct]] 13&nbsp;mi (21&nbsp;km)
*[[New York City water supply system]]
**[[Catskill Aqueduct]] 28 miles (45&nbsp;km) of grade tunnel, 35 miles (56&nbsp;km) of pressure tunnel.
**[[Delaware Aqueduct]] 85 miles (137&nbsp;km)
**[[New York City Water Tunnel No. 3]] 60 miles (97&nbsp;km)
*[[Päijänne Water Tunnel]] 75 miles (120&nbsp;km)
*[[San Juan–Chama Project]]
** Azotea Tunnel 12.8 miles (20.6&nbsp;km)
* The [[Kowloon Group of Reservoirs|Inter-reservoirs Transfer Scheme]] (IRTS) in Kwai Chung and Sha Tin, New Territories, Hong Kong ((convert|1.74|mi|km))

==See also==
* [[Canal tunnel]]
* [[Culvert]]
* [[Qanat]]

((DEFAULTSORT:Water Tunnel (Physical Infrastructure)))
[[Category:Water tunnels| ]]


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