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Código Técnico de la Edificación
The Código Técnico de la Edificación (CTE) is Spain's building code, approved by Royal Decree in 2006 and setting basic safety and habitability requirements for buildings.
Cody Dock Rolling Bridge
The Cody Dock Rolling Bridge is a hand-powered steel footbridge at Cody Dock in Canning Town, London, completed in 2022, that rolls 180 degrees to let boats pass.
Cofferdam
A cofferdam is a temporary water enclosure pumped dry to allow construction work, used for bridge piers, dam foundations, locks, and shoreline repair, and removed afterward.
Coit Tower
Coit Tower, also known as Coit Memorial Tower, is a 210-foot Art Deco tower atop Telegraph Hill in San Francisco, completed in 1933 with bequest funds from Lillie Hitchcock Coit.
Colditz Castle
Colditz Castle (Schloss Colditz) is a castle in Saxony, Germany, first recorded in 1046 and best known as the officers' POW camp Oflag IV C in the Second World War, whose escape attempts made it famous.
Colegio de Ingenieros de Caminos, Canales y Puertos
The Colegio de Ingenieros de Caminos, Canales y Puertos (CICCP) is the Spanish public-law professional association ordering the civil engineering profession, with about 25,000 members and its seat in Madrid.
College Square (Dublin)
College Square is a mixed-use development in Dublin 2, developed by Marlet Property Group. Completed in 2025, it is the tallest habitable building in the Republic of Ireland.
Cologne Cathedral
Cologne Cathedral (Kölner Dom) is the Gothic Catholic cathedral of Cologne, Germany, built from 1248 to 1880, whose twin towers made it the tallest building in the world.
Color of water
Color of water is the visual tint of a body of water, arising from water's intrinsic pale blue color and from dissolved substances like tannins, iron, and phytoplankton pigments.
Colorado River Aqueduct
The Colorado River Aqueduct is a 242-mile aqueduct in Southern California, built between 1933 and 1941 to pump Colorado River water from Lake Havasu to Lake Mathews near Riverside.
Colorado River Storage Project
The Colorado River Storage Project (CRSP) is a federal multi-purpose water and power project in the Upper Colorado River Basin, authorized by Congress on April 11, 1956.
Colorado State Capitol
The Colorado State Capitol is Colorado's statehouse in Denver, a Renaissance Revival building modeled on the United States Capitol, with a dome gilded in Colorado gold.
Colorado–Big Thompson Project
The Colorado–Big Thompson Project is a Bureau of Reclamation diversion carrying Colorado River water under the Continental Divide to northeastern Colorado, authorized in 1937 and built from 1938 to 1956.
Columbia Basin Project
The Columbia Basin Project is a federal Bureau of Reclamation project in east central Washington that pumps Columbia River water from Grand Coulee Dam to irrigate about 671,000 acres.
Columbia Center
Columbia Center is a 76-story office skyscraper at 701 Fifth Avenue in downtown Seattle. Opened in 1985, it is the tallest building in Seattle and the Pacific Northwest.
Columbia River Treaty
The Columbia River Treaty is a 1961 agreement between Canada and the United States, ratified in 1964, that coordinates flood control and hydroelectric power generation in the Columbia River Basin.
Column
A column is a vertical structural element that carries loads from beams, slabs, or arches down its shaft into the foundation; in classical architecture it has a capital, shaft, and usually a base.
Combined sewer
A combined sewer is a sewer system that carries sanitary sewage and stormwater through the same pipes, so heavy rain can trigger combined sewer overflows of untreated sewage to rivers.
Combined sewer overflow
A combined sewer overflow (CSO) is the discharge of untreated wastewater and stormwater into rivers, lakes, or coastal waters when rainfall exceeds the capacity of a combined sewer system.
Comfort Inn and Suites
Comfort Inn and Suites is a family of franchised hotel brands owned by Choice Hotels International, launched with the first Comfort Inn in Atlanta in 1981.
Commercial property
Commercial property, also called commercial real estate (CRE), is real estate held to generate profit through rental income or capital appreciation, covering offices, retail, industrial facilities, and hotels.
Commission of sewers
A commission of sewers was an English local body, first recorded in 1258, that supervised drainage and sea defenses and levied rates on benefiting landholders.
Commodore Barry Bridge
The Commodore Barry Bridge is a steel cantilever truss bridge carrying U.S. Route 322 across the Delaware River between Chester, Pennsylvania, and Bridgeport, New Jersey, opened in 1974.
Common data environment
A common data environment (CDE) is an access-controlled platform, and its workflow, that stores a construction project's models, drawings, and documents so every team works from one source of truth.
Community Rating System
The Community Rating System (CRS) is a voluntary FEMA program, created in 1990, that rewards communities for floodplain management exceeding minimum requirements with discounts on flood insurance premiums.
Compaction grouting
Compaction grouting is a ground improvement technique, pioneered in the United States in the 1950s, that densifies loose soil by injecting stiff, low-mobility grout to displace and compact it.
Compagnie universelle du canal interocéanique
The Compagnie universelle du canal interocéanique was a French company led by Ferdinand de Lesseps that tried to build a Panama canal from 1881 to 1889.
Comparison of immersed tube tunnels with bored tunnels and bridges
A comparison of the three principal ways to carry road or rail across a navigable waterway: immersed tube tunnels, bored tunnels beneath the bed, and bridges over it.
Compensation grouting
Compensation grouting is a geotechnical technique that injects cement grout between a tunnel and the structures above it to offset tunnelling settlement, first used in the UK at Waterloo Station and later beneath Big Ben.
Composite order
The Composite order is a Roman classical order of architecture whose capital combines Ionic volutes with Corinthian acanthus leaves, recognized as a separate order in the Renaissance.