2,617 articles
Carquinez Bridge
The Carquinez Bridge is a pair of highway bridges carrying Interstate 80 across the Carquinez Strait between Crockett and Vallejo, California, opened in 1958 and 2003.
Carroll Street Bridge
The Carroll Street Bridge is a retractile bridge built in 1889 over the Gowanus Canal in Brooklyn, New York, the oldest known retractile bridge in the United States.
Carry-over factor
The carry-over factor is a coefficient in structural analysis, the ratio of the moment induced at a member's far end to the moment applied at the near end.
Casas de Don Antonio Roman Bridge
Casas de Don Antonio Roman Bridge: stone bridge over the Río Ayuela, Cáceres, Spain, on the Vía de la Plata (Vía XXIV) near the mansio Ad Sorores; four granite vaults, medieval features with Roman origins.
Castellum aquae
Castellum aquae (castellum divisorium): Roman terminal distribution basin of an aqueduct, regulating and dividing water into city pipes; best-preserved examples at Nîmes and Pompeii, with others at Ostia, Tharros, and Rome.
Catskill Aqueduct
The Catskill Aqueduct is a 92-mile conduit carrying up to 40 percent of New York City's drinking water from Ashokan Reservoir to Yonkers, built between 1907 and 1915.
Causeway connecting Meninx (Gerba) to mainland
Causeway linking Djerba island (ancient Meninx, also Gerba) to the Tunisian mainland at El Kantara; a Roman-era causeway, possibly Pons Zitha, is presumed beneath the modern 7 km roadway, widened 1973.
Cebu–Cordova Link Expressway
The Cebu–Cordova Link Expressway (CCLEX), also called the Cebu–Cordova Bridge, is an 8.9-kilometer toll bridge in Metro Cebu, Philippines, and the longest bridge in the country.
Cecil Lue-Hing
Cecil Lue-Hing (1930–2026) was a Jamaican-born American environmental engineer who spent 28 years directing research at Chicago's water reclamation district and advanced sewage sludge reuse as biosolids.
Cecilia (tunnel boring machine)
Cecilia is one of two tunnel boring machines that dug HS2's 10-mile Chiltern tunnel beneath the Chiltern Hills, launched in 2021 and completing her drive in March 2024.
Cedae
Cedae, or Companhia Estadual de Águas e Esgotos do Rio de Janeiro, is a Rio de Janeiro state company created in 1975 that supplies bulk water to the metropolitan region.
Cedar Covered Bridge
Cedar Covered Bridge, also known as Cedar Bridge, is a covered bridge over Cedar Creek near Winterset, Iowa, first built in 1883 and twice destroyed by arson.
Cedars Lock and Dam Historic District
Cedars Lock and Dam Historic District is a National Register district in Little Chute, Wisconsin, with a lock, dam, canal, and lockkeeper's house on the Lower Fox River.
Central Arizona Project
The Central Arizona Project is a 336-mile canal and pumping system carrying Colorado River water from Lake Havasu to Phoenix and Tucson, authorized in 1968 and built from 1973 to 1993.
Central Pollution Control Board
The Central Pollution Control Board (CPCB), India's statutory pollution regulator, was created in 1974 and sets discharge standards while monitoring water and air quality nationwide.
Central Subway (San Francisco)
The Central Subway is a 1.7-mile Muni light rail extension in San Francisco, running mostly underground from the Caltrain station at 4th and King streets to Chinatown-Rose Pak station.
Central Utah Project
The Central Utah Project is a federal Bureau of Reclamation project moving Colorado River water from eastern Utah to the Wasatch Front, authorized by Congress in 1956.
Central Valley Project
The Central Valley Project is a federally run California water project that stores and delivers water from the Sacramento and San Joaquin rivers to farms and cities.
Centrifugal pump
A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase a fluid's velocity, converting it into pressure in a volute or diffuser casing.
Ceramic water filter
A ceramic water filter is a point-of-use device made of porous fired clay, often coated with colloidal silver, that removes bacteria and protozoa from drinking water.
Cesspit
A cesspit, also called a cesspool, is a pit or sealed tank dug into the ground to collect sewage, emptied periodically rather than discharging treated effluent.
Ceuta border fence
The Ceuta border fence, also called the Ceuta barrier (valla de Ceuta), is a fortified barrier on the border between Spanish Ceuta and Morocco, built in stages since 1993.
Chamber pot
A chamber pot, also called a jordan, is a portable bowl-shaped vessel kept in the bedroom and used as a toilet at night before indoor plumbing.
Champlain Canal
The Champlain Canal is a 60-mile canal in eastern New York connecting the Hudson River at Waterford to Lake Champlain at Whitehall, opened in 1823.
Chand Baori
Chand Baori, or Chand Baori stepwell, is a monumental ancient stepwell at Abhaneri near Jaipur, Rajasthan, built around the eighth to ninth century to conserve water.
Changtai Yangtze River Bridge (常泰长江大桥)
The Changtai Yangtze River Bridge (常泰长江大桥) is a road-rail bridge over the Yangtze in Jiangsu, China, opened in 2025 with the world's longest cable-stayed span, at 1,208 meters.
Channel Tunnel
The Channel Tunnel, also called the Chunnel, is a 50.5 km railway tunnel under the English Channel linking Folkestone and Coquelles, inaugurated on 6 May 1994 by Queen Elizabeth II and President François Mitterrand.
Channel Tunnel fire safety review
The Channel Tunnel fire safety review covers the official inquiries, service disruptions, and safety changes after the 1996 and 2008 HGV shuttle fires, including the 2008 report's 39 recommendations.
Chapel of Our Lady
Chapel of Our Lady, Rotherham: Grade I listed medieval bridge chapel of 1483 on Rotherham Bridge, probably founded by Archbishop Thomas Rotherham; later almshouse, jail, and tobacconist, reconsecrated 1924.
Charles A. Kircher
Charles A. Kircher is an American earthquake engineer who founded Kircher & Associates in Palo Alto and was elected to the National Academy of Engineering in 2019.