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Bogibeel Bridge
The Bogibeel Bridge is a 4.94 km double-deck rail-cum-road bridge across the Brahmaputra River in Assam, India, connecting Dibrugarh and Dhemaji; inaugurated in 2018, it is India's longest rail-cum-road bridge.
Bogotá Water Company
The Bogotá Water Company (Empresa de Acueducto y Alcantarillado de Bogotá, EAAB) is the public utility supplying water and sewerage in Bogotá, Colombia, the largest in the sector.
Boil-water advisory
A boil-water advisory, also called a boil-water order, is a public announcement telling residents to boil tap water before ingesting it, issued when the supply is or may be contaminated.
Boise River Diversion Dam
The Boise River Diversion Dam is an irrigation dam on the Boise River near Boise, Idaho, completed in 1908 to divert water into the New York Canal.
Bollman truss
Patented in 1852 by Wendel Bollman, the Bollman truss was an American bridge system that utilized cast and wrought iron in its rigid and suspension design.
Bolmen Water Tunnel
The Bolmen Water Tunnel (Bolmentunneln) is an 80 km raw-water tunnel in southern Sweden carrying drinking water from Lake Bolmen to northern Skåne, in service since 1987.
Bolshoy Obukhovsky Bridge (Большой Обуховский мост)
The Bolshoy Obukhovsky Bridge (Большой Обуховский мост) is a cable-stayed road bridge over the Neva in St Petersburg, the city's only fixed, non-drawbridge crossing, opened in 2004 and 2007.
Bonnet Carré Spillway
The Bonnet Carré Spillway is a flood-control structure in St. Charles Parish, Louisiana, that diverts Mississippi River floodwater into Lake Pontchartrain to protect New Orleans.
Booz Allen Hamilton
Booz Allen Hamilton is an American technology and consulting company providing services primarily to the US government. Founded in 1914 in Chicago, it is headquartered in McLean, Virginia.
Bored pile
A bored pile, also known in North America as a drilled shaft or drilled pier, is a deep foundation made by drilling a hole and filling it with cast-in-place reinforced concrete.
Boskalis
Boskalis is a Dutch dredging and marine services company with over 100 years of experience, known for land reclamation, coastal defense, and heavy marine transport projects.
Bosphorus Bridge
The Bosphorus Bridge, officially the 15 July Martyrs Bridge, is a suspension bridge in Istanbul, opened in 1973 as the first spanning Europe and Asia.
Boston Consulting Group
Boston Consulting Group (BCG), founded 1963 by Bruce Henderson, Boston-headquartered private management consultancy; 33,500 employees, $14.4B firm-reported revenue, 40% from tech and AI, CEO Christoph Schweizer.
Bottom outlet (dam)
A bottom outlet, also called a low-level outlet, is a gated conduit through a dam near the reservoir base, used for emergency drawdown, water level control, and sediment flushing.
Bottom-up cut-and-cover construction
Bottom-up cut-and-cover construction is a tunnelling method in which a full-depth trench is opened, the tunnel is built from the floor upward, and the trench is backfilled.
Boulder Canyon Project
The Boulder Canyon Project is the United States federal undertaking authorized in 1928 to build Hoover Dam on the Colorado River and the All-American Canal for irrigation, flood control, and power.
Boussinesq theory (pavement analysis)
Boussinesq theory in pavement analysis applies Boussinesq's 1885 elastic half-space equations, giving stresses, strains, and deflections beneath a surface load; it treats the pavement and subgrade as one layer.
Boutikos potamos
Boutikos potamos (Βουτικός ποταμός), the Butic Canal, was a Roman-era artificial watercourse crossing the Nile Delta west to east, about 185–200 km, named only in Ptolemy's Geography and never verified by excavation.
Box girder bridge
A box girder bridge is a bridge whose deck is carried by one or more girders with a hollow box-shaped cross-section, first used on the Britannia Bridge in 1850.
Box Tunnel
Box Tunnel is a railway tunnel in Wiltshire, England, designed by Isambard Kingdom Brunel for the Great Western Railway, opened in 1841 as the world's longest railway tunnel.
Brahmaputra dam disputes
The Brahmaputra dam disputes are disagreements among China, India, and Bangladesh over hydropower dams and water diversion on the Brahmaputra River, with no binding water-sharing treaty.
Bramlette McClelland
Bramlette McClelland, born Thomas Bramlette McClelland, was an American geotechnical engineer in Houston who performed the first offshore site investigation in 1947, founded McClelland Engineers, and joined the National Academy of Engineering in 1979.
Brenner Base Tunnel
The Brenner Base Tunnel, also known as Brenner Tunnel, is a 55 km low-gradient railway tunnel under construction between Innsbruck in Austria and Fortezza in Italy beneath the Brenner Pass.
Bret Lizundia
Bret Lizundia is an American structural engineer at Rutherford & Chekene in San Francisco, elected to the National Academy of Engineering in 2024 for seismic design.
Briare Aqueduct
The Briare Aqueduct (pont-canal de Briare) is a 662-meter navigable aqueduct in central France, opened in 1896 to carry the Canal latéral à la Loire over the Loire.
Bridge
A bridge is a structure built to span an obstacle such as a river, valley, or road, allowing people and vehicles to cross; basic types include beam, arch, and suspension.
Bridge at Abodiacum
Bridge at Abodiacum: ancient Roman bridge over the Licca (Lech) river at Abodiacum, the road station identified with Epfach, Bavaria, on the Via Claudia Augusta between Augsburg and the Alps.
Bridge at Aspendos
Bridge at Aspendos (Eurymedon Bridge): Seljuk seven-arch bridge of 1239/40 over the Eurymedon (Köprüçay) near Aspendos, Turkey, built on a larger Roman bridge and reused about 250 perforated aqueduct siphon pipes as spolia.
Bridge at Augusta Vindelicum
Bridge at Augusta Vindelicum: a Pleiades-recorded ancient bridge over the Licca (Lech) river at Augusta Vindelicum, Roman Augsburg, capital of Raetia. Mapped in Barrington Atlas 12 D4; no physical remains found in Augsburg.
Bridge at Brugnato
Bridge at Brugnato (Ponte romano sul fiume Vara): medieval stone bridge, probably Roman in origin, over the Vara river at Brugnato, Liguria. Carried the Pontremoli–Sestri Levante road; central arch rebuilt in 1660 after a flood.