2,617 articles
Dock
A dock is an artificial enclosure of water, closed by gates or locks, where vessels can be berthed, loaded, or repaired away from the tide.
Dolos (breakwater)
The dolos is a concrete armor unit shaped like a ship's anchor, invented in South Africa in 1963 and placed on breakwaters worldwide to dissipate wave energy economically.
Dom Luís I Bridge
The Dom Luís I Bridge (Ponte Dom Luís I) is an 1886 double-deck iron arch bridge over the Douro River between Porto and Vila Nova de Gaia, Portugal.
Dominick M. Servedio
Dominick M. Servedio is an American civil engineer who led STV Group as chairman and CEO and was elected to the National Academy of Engineering in 2017.
Dominion Bridge Company
The Dominion Bridge Company was a Canadian heavy engineering company, chartered in 1882, that built landmark bridges and steel buildings across Canada before going bankrupt in 1998.
Donald O. Dusenberry
Donald O. "Don" Dusenberry is an American structural and forensic engineer elected to the National Academy of Engineering in 2024 for his work on structural design load standards.
Donghai Bridge
Donghai Bridge (东海大桥, East Sea Bridge) is a 32.5 km sea-crossing expressway bridge in China, opened in 2005 as the only road link between Shanghai and Yangshan Port.
Dorman Long
Dorman Long was a British iron and steel company of Middlesbrough, England, incorporated in 1889, which fabricated the steel for the Sydney Harbour Bridge and Tyne Bridge.
Dortmund-Ems Canal
The Dortmund-Ems Canal (German: Dortmund-Ems-Kanal) is a federal inland waterway in Germany linking Dortmund with the North Sea port of Emden, opened by Kaiser Wilhelm II in 1899.
Double shield TBM
A double shield TBM (DS TBM) is a hard-rock tunnel boring machine combining an open gripper TBM and a single-shield TBM, switching thrust modes as ground conditions change.
Double-curvature arch dam
A double-curvature arch dam is a concrete arch dam curved both horizontally and vertically into a bowl shape, which lets designers build it thinner than other concrete dams.
Double-shield tunnel boring machine
A double-shield tunnel boring machine is a hard-rock TBM whose telescopic two-shield body lets boring and segmental lining erection proceed simultaneously, patented by SELI and Robbins in 1971.
Douglas C. Moorhouse
Douglas Cecil Moorhouse (1926–2012) was an American civil engineer who led the consulting firm Woodward-Clyde for decades, worked on the Trans-Alaska pipeline, and joined the National Academy of Engineering in 1982.
Douglas M. Owen
Douglas M. Owen is an American civil and environmental engineer specializing in drinking water treatment and potable water reuse, elected to the National Academy of Engineering in 2023.
Douro hydroelectric cascade
The Douro hydroelectric cascade is the chain of run-of-river dams Portugal built on the Douro river, generating power and lifting vessels through locks between Porto and Spain.
Dowel-laminated timber
Dowel-laminated timber (DLT), also known as Brettstapel or DowelLam, is an all-wood mass timber panel in which hardwood dowels lock softwood boards together without metal fasteners or adhesives.
Dragados
Dragados is a Spanish construction company founded in 1941, known for underground works with over 550 projects in 20 countries, and part of the ACS Group since 2003.
Drain cleaner
Drain cleaner, also known as drain opener, is a corrosive or enzymatic product that clears drain blockages with sulfuric acid, sodium hydroxide, oxidizers, or slow-acting enzymes, and is among the most dangerous products in households.
Drainage
Drainage is the natural or engineered removal of surface water and excess groundwater from land and buildings, becoming urban drainage systems of gutters, sewers, and ponds in cities.
Drainage canal
Drainage canal: open artificial channel (open channel drainage, ICID) conveying excess water and storm runoff by gravity. Key facts: silting is the main maintenance problem, 2-3 year cleaning intervals, 70 cm/s self-cleansing velocity, debris blockage raises flood levels.
Drainage ditch
Drainage ditch: an open channel conveying excess water from farmland, roads, and development. Also called a swale when vegetated. Ancient origins in Mesopotamia; central to US farm drainage, erosion control, water quality, and ditch biodiversity.
Drainage law
Drainage law, also called land drainage law, is the body of property law governing landowners' rights over surface water flowing between parcels, resolved in the United States under three rules.
Drainage of the Fens
The drainage of the Fens transformed the Great Level of East Anglian fenland into farmland, financed by aristocratic Adventurers, engineered by Cornelius Vermuyden, and resisted by fen commoners.
Drainage water
Drainage water, or agricultural drainage, is excess water removed from farmland by surface or subsurface drains. It is normally saltier than irrigation supply, is reused for salt-tolerant crops, and carries nitrogen and selenium pollution.
Drawbridge
A drawbridge is a movable bridge whose span opens to let boats and ships pass, most often meaning a bascule bridge; the term also covers swing and vertical lift bridges.
Dredging
Dredging, also called dregging, is the excavation and removal of sediment from the bottom of rivers, harbors, lakes, and channels, mainly to keep waterways navigable for shipping.
Dried mineral water salt
Dried mineral water salt, marketed as Saltwell by Sweden's Salinity, is a natural salt crystallized from Atacama Desert brine at 65% NaCl and 35% KCl, giving 35% less sodium; GRAS in the US via GRN 577 (2015).
Drilling and blasting
Drilling and blasting, also called drill and blast, is a rock excavation method that fragments rock with explosives in boreholes, used widely in tunnels and mining.
Drinking water
Drinking water, also called potable water, is water safe enough for human consumption, managed through treatment and regulation; globally, coverage rose from 68% to 74% between 2015 and 2024.
Drinking Water Directive
The Drinking Water Directive is the European Union's binding law on water for human consumption, replacing the 1998 directive and setting enforceable limits for contaminants including lead and PFAS.