2,617 articles
Williamson Tunnels
The Williamson Tunnels are a labyrinth of brick-arched and sandstone-vaulted chambers built under Liverpool's Edge Hill district by tobacco merchant Joseph Williamson between 1810 and 1840.
Wind bracing
Wind bracing is the system of secondary members in a bridge superstructure, such as cross-frames, diaphragms, and lateral diagonal bracing, that stabilizes the structure against wind and torsional loads.
Wind pump
Wind pump (windpump): a wind-driven water-lifting machine, usually a multibladed steel rotor on a tower driving a piston pump in a well below; used to dewater the Netherlands from the 13th century, mass-produced in the United States from the 1860s, with over one million still in use.
Wolf Creek Dam
Wolf Creek Dam is a Corps of Engineers dam on the Cumberland River near Jamestown, Kentucky, completed in 1952, impounding Lake Cumberland for flood control and hydropower.
Woodhead Tunnel
The Woodhead Tunnels are three railway tunnels under the Pennine moors between Woodhead and Dunford Bridge, on the Manchester to Sheffield route from 1845 until the line closed in 1981.
Woodrow Wilson Bridge
The Woodrow Wilson Bridge, formally the Woodrow Wilson Memorial Bridge, carries Interstate 95 and the Capital Beltway over the Potomac River between Alexandria, Virginia, and Prince George's County, Maryland.
Woolwich foot tunnel
The Woolwich foot tunnel is a 504-meter pedestrian tunnel beneath the Thames in London, opened in 1912 to connect Woolwich with North Woolwich through Grade II listed red-brick entrance rotundas.
Work in compressed air
Work in compressed air, or hyperbaric work, is construction labor in chambers pressurized above atmospheric to hold back groundwater in soft-ground tunnels and caissons, first patented in 1830.
World Commission on Dams
The World Commission on Dams was an independent 12-member body formed by the World Bank and IUCN in 1998 to review large dams, releasing its 2000 report Dams and Development.
World Guide to Covered Bridges
The World Guide to Covered Bridges is the reference register of covered bridges maintained by the National Society for the Preservation of Covered Bridges, first published in 1959.
WSP Global
WSP Global Inc. is a Canadian professional services firm headquartered in Montréal that provides engineering and advisory services in over 50 countries with about 83,000 employees.
Wyangala Dam
Wyangala Dam is a major water storage on the Lachlan River in Central West New South Wales, Australia, built between 1928 and 1935 and enlarged between 1961 and 1971.
Xayaburi Dam (ເຂື່ອນໄຊຍະບູລີ)
Xayaburi Dam (ເຂື່ອນໄຊຍະບູລີ), first dam on the lower Mekong mainstream in Xayaburi province, Laos; 1,285 MW run-of-river barrage commissioned 29 October 2019, exporting 1,220 MW to Thailand under a 29-year PPA at 2.16 baht/kWh.
Xayaburi Dam dispute
The Xayaburi Dam dispute was a dispute over a hydroelectric dam on the Lower Mekong River in Laos, the first mainstream dam reviewed by the Mekong River Commission.
Xbloc
Xbloc is a single-layer, interlocking concrete armor unit for breakwaters and shore protections, developed by Delta Marine Consultants in the Netherlands and introduced in 2003.
Xiaolangdi Dam
Xiaolangdi Dam (小浪底) is a large multipurpose dam on the Yellow River in Henan Province, China, built for flood control, sediment reduction, and power generation.
Xiaowan Dam
The Xiaowan Dam (小湾坝), also called the Xiaowan Hydropower Station, is a 294.5 m double-curvature arch dam on the Lancang River in Yunnan, China, with a 4,200 MW power station.
Xihoumen Bridge
The Xihoumen Bridge (西堠门大桥) is a suspension bridge in Zhejiang, China, opened in 2009 to link Jintang and Cezi islands with a 1,650 m main span, then China's longest.
Yacyretá Dam
The Yacyretá Dam is a binational Argentina–Paraguay hydroelectric complex on the Paraná River, jointly governed under a 1973 treaty, with 20 Kaplan turbines and 3,200 MW of installed capacity.
Yamuna Canal
The Yamuna Canal refers to two irrigation channels, the Western and Eastern Yamuna Canals, drawing water from the Yamuna River at Hathnikund Barrage in Haryana.
Yangqu hydroelectric plant
Yangqu hydroelectric plant (羊曲水电站) is a 1,200 MW hydropower station on the upper Yellow River in Qinghai, China, fully commissioned in December 2024 and notable for China's first embedded concrete-face rockfill dam.
Yavuz Sultan Selim Bridge
The Yavuz Sultan Selim Bridge (Yavuz Sultan Selim Köprüsü) is a hybrid cable-stayed suspension bridge over the Bosphorus in Istanbul, opened in 2016 as the third Bosphorus crossing.
Yellow Fleet
The Yellow Fleet was a group of merchant ships trapped in the Great Bitter Lake section of the Suez Canal from 1967 to 1975 after the Six-Day War.
YIT
YIT (Finnish: Yleinen Insinööritoimisto, "General Engineering Office") is Finland's largest construction company, founded in 1912, headquartered in Helsinki, active in seven European countries, and listed on Nasdaq Helsinki.
Yolo Bypass
The Yolo Bypass is a leveed flood-control basin in the Sacramento Valley west of Sacramento that routes Sacramento River floodwaters south to the Sacramento–San Joaquin Delta.
Yongdam Dam
Yongdam Dam (용담댐) is a multipurpose dam on the Geum River in Jinan County, South Korea, completed in 2001 to supply water to Jeonju and generate hydropower.
Yorkshire Water
Yorkshire Water is a privately owned water and sewerage company serving most of Yorkshire, England. It was formed in 1989 when the Yorkshire Water Authority was privatized.
Yusufeli Dam
Yusufeli Dam (Yusufeli Barajı) is a 275 m concrete arch dam on the Çoruh River in Artvin Province, Turkey, the country's highest, inaugurated in 2022.
Zaghouan Aqueduct
The Zaghouan Aqueduct is an ancient Roman aqueduct in present-day Tunisia, built from the 2nd century, carrying water about 132 km from Mount Zaghouan's springs to Carthage.
Zanja
A zanja is a ditch or trench, and in the American Southwest an irrigation ditch carrying river water by gravity, as under Spanish and Mexican rule.