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Aqueduto das Águas Livres
The Aqueduto das Águas Livres is a baroque, gravity-fed aqueduct built for Lisbon between 1731 and 1799, crossing the Alcântara valley on 35 stone arches.
Aquifer storage and recovery
Aquifer storage and recovery (ASR) is a water management method that injects treated water into an aquifer through a well and later pumps it back out for use.
Aratozawa Dam
Aratozawa Dam is a 74.4-meter rockfill dam on the Nihasama River in Kurihara, Miyagi Prefecture, Japan, completed in 1998 for flood control and irrigation, forming Lake Aizen.
Arch bridge
An arch bridge is a bridge whose main load-carrying element is an arch, a curved structure carrying load primarily in compression, and among the oldest bridge forms.
Arch dam
An arch dam is a concrete dam curved in plan so water pressure is carried as arch thrust into the canyon walls, using far less concrete than a gravity dam.
Arch-gravity dam
An arch-gravity dam is a curved concrete dam that resists water partly by arch action into the valley walls and partly by its own weight.
Archimedes' screw
The Archimedes' screw, also called the screw pump or cochlias, raises water by turning an inclined helical screw, and is credited to Archimedes of Syracuse in the 3rd century BC.
Architectural engineering
Architectural engineering, also called building engineering, applies engineering principles and technology to the design, construction, and maintenance of buildings, with engineers designing mechanical, electrical, lighting, and structural systems.
Argo Tunnel
Argo Tunnel, renamed Cloudflare Tunnel, is a Cloudflare product introduced in 2018 that lets servers connect only through Cloudflare, using outbound encrypted connections that remove the need for open firewall ports or public IP addresses.
Arlington Memorial Bridge
Arlington Memorial Bridge is a neoclassical bridge spanning the Potomac River between the Lincoln Memorial and Arlington National Cemetery, opened in 1932 as a Civil War reunification memorial.
Arsenic contamination of groundwater
Arsenic contamination of groundwater is the presence of naturally occurring or human-introduced arsenic in aquifers above drinking-water safety limits, affecting about 140 million people worldwide.
Arsenic removal
Arsenic removal covers water treatment processes that lower arsenic in drinking water to a safe level, usually the WHO and US standard of 10 µg/L.
Arsham Amirikian
Arsham Amirikian was a civil and structural engineer who served as head designing engineer of the U.S. Navy Bureau of Yards and Docks and designed Cold War protective structures.
Arthur Kill Vertical Lift Bridge
The Arthur Kill Vertical Lift Bridge is the only rail freight gateway into Staten Island from the national network, handling modern double-stack trains after its 2007 reopening.
Arthur Ravenel Jr. Bridge
The Arthur Ravenel Jr. Bridge, also known as the Ravenel Bridge and Cooper River Bridge, is a cable-stayed bridge over the Cooper River in South Carolina, opened in 2005.
Arup
Arup is an independent, multinational engineering and design consultancy headquartered in London. Founded by Ove Arup in 1946, it engineered the Sydney Opera House and the Centre Pompidou.
Arup Group
Arup Group, formally Ove Arup & Partners, is a British multinational engineering and consulting firm founded in 1946, known for the Sydney Opera House and Centre Pompidou.
As-built survey
An as-built survey, also called a record or as-constructed survey, records a structure's real position, elevation, and dimensions as built, typically by a licensed surveyor.
ASCE 41
ASCE 41, titled Seismic Evaluation and Retrofit of Existing Buildings, is an American Society of Civil Engineers standard for evaluating and strengthening existing buildings to withstand earthquakes.
Ashfork-Bainbridge Steel Dam
The Ashfork-Bainbridge Steel Dam, also called the Ash Fork Steel Dam, is a steel dam built in 1898 near Ash Fork, Arizona, the first large steel dam in the world.
Ashtabula County, Ohio
Ashtabula County is a county on the southern shore of Lake Erie in northeast Ohio, the state's largest by area and its covered bridge capital.
Asphalt
Asphalt is a dark, cement-like material obtained from petroleum processing, in which bitumens predominate; it is used primarily for road construction, either as the binder in pavement mixtures or in refined products.
ASTM A615
ASTM A615/A615M is ASTM International's standard specification for deformed and plain carbon-steel bars used for concrete reinforcement, covering four yield-strength grades from 40,000 to 100,000 psi.
ASTM C150
ASTM C150/C150M, titled Standard Specification for Portland Cement, is the ASTM International standard setting chemical and physical requirements for portland cement in the United States, first issued in 1940.
Aswan Dam
Aswan Dam (Khazzān Aswān) denotes two Nile dams at Aswan, Egypt: the British-built 1902 Aswan Low Dam and the 1970 Aswan High Dam, a 111 m rock-fill embankment creating Lake Nasser, generating 10 billion kWh yearly and ending the Nile flood.
Aswan Low Dam
The Aswan Low Dam, also called the Old Aswan Dam or Assuan Dam, is a masonry buttress dam on the Nile at Aswan, Egypt, built between 1899 and 1902.
Atal Tunnel
Atal Tunnel, also called the Rohtang tunnel, is a 9.02 km highway tunnel in Himachal Pradesh, India, opened in 2020 beneath the Rohtang Pass to keep Lahaul connected year-round.
Atatürk Dam
Atatürk Dam (Atatürk Barajı) is a claycore rockfill dam and hydroelectric power station on the Euphrates River, serving as the centerpiece of the Southeastern Anatolia Project (GAP).
Atatürk Reservoir
Atatürk Reservoir (Atatürk Baraj Gölü) is the lake impounded by the Atatürk Dam on the Euphrates in southeastern Turkey, Turkey's third-largest lake after Van and Tuz.
Atchafalaya Basin Floodway System
The Atchafalaya Basin Floodway System is a system of levees and floodways in south-central Louisiana that carries a share of Mississippi River floodwater to the Gulf.