2,617 articles
Eastern span replacement of the San Francisco–Oakland Bay Bridge
The eastern span replacement of the San Francisco–Oakland Bay Bridge replaced the seismically vulnerable eastern half with a new skyway and self-anchored suspension bridge, opened in 2013.
Eastman tunnel
The Eastman tunnel, or Hennepin Island tunnel, was a tailrace tunnel at St. Anthony Falls in Minneapolis whose collapse in 1869 nearly destroyed the falls.
Eau de Paris
Eau de Paris is the public water company of the City of Paris, serving about 3 million users and operating the service since January 2010.
Eccentrically braced frame
An eccentrically braced frame (EBF) is a steel seismic-force-resisting system in which braces connect to a beam off-center, creating a short link that yields to dissipate earthquake energy.
École des Ponts ParisTech
École des Ponts ParisTech, officially École nationale des ponts et chaussées (ENPC), is a French grande école founded in 1747 to train state engineers for bridges and roads.
Ecological effects of dam removal
Dam removal sets off sediment release, channel recovery, fish recolonization, and vegetation growth on former reservoir beds, as seen at the Elwha and Klamath rivers.
Ecological sanitation
Ecological sanitation, or EcoSan, is a family of sanitation methods that treat human excreta as a resource rather than waste, recycling its nutrients as fertilizer, compost, or biogas.
Economics, law and policy of dam removal
The economics, law and policy of dam removal covers who pays to dismantle a dam, who bears liability, and removal versus repair, with over 2,000 US dams removed since 1912.
Edersee Dam
The Edersee Dam (Edertalsperre) is a curved masonry gravity dam on the Eder river in Hesse, Germany, built 1908 to 1914 to feed the Mittelland Canal.
Edmund Pettus Bridge
The Edmund Pettus Bridge is a 1940 bridge across the Alabama River at Selma, Alabama, where the 1965 Bloody Sunday march attack spurred the Voting Rights Act.
Effective length factor
The effective length factor, usually written K, is a dimensionless coefficient in structural engineering that converts a compression member's actual length into an equivalent pinned-end length for buckling design.
Effects of Hurricane Katrina in New Orleans
The effects of Hurricane Katrina in New Orleans, also called the Great Flood of New Orleans, began when levee failures on August 29, 2005 flooded 80 percent of the city, killing hundreds.
Effluent
Effluent is wastewater that has been processed or partially processed and released into the environment, from domestic sewage, industrial discharge, or agricultural runoff, and is governed by treatment standards such as US secondary limits.
Eifel Aqueduct
The Eifel Aqueduct (Eifelwasserleitung) was a 95-kilometer Roman aqueduct, built around AD 80, that carried spring water from the Eifel hills to the Roman city of Cologne.
Eiksund Tunnel
The Eiksund Tunnel is a subsea road tunnel in Møre og Romsdal, Norway, opened in 2008 and the world's deepest undersea road tunnel at 287 m.
Eisenhower Tunnel
The Eisenhower Tunnel is the westbound bore of the Eisenhower-Johnson Memorial Tunnel, a dual-bore tunnel on Interstate 70 about 60 miles west of Denver that crosses the Continental Divide.
El Kantara Bridge
El Kantara Bridge (Bab El Kantra Bridge), Constantine, Algeria: historic Rhumel gorge crossing rebuilt as Roman stone bridge (161), Ottoman bridge (1792), French cast-iron arch (1863), and reinforced-concrete arch (1951).
El Paso Water Utilities
El Paso Water Utilities, branded El Paso Water, is the public utility supplying water, wastewater, and stormwater service to about 220,000 customers in El Paso, Texas, under the city's Public Service Board.
El-Salam Canal
El-Salam Canal (Arabic for "Peace Canal") is an irrigation canal in northeastern Egypt that carries blended Nile and drainage water under the Suez Canal into Sinai for land reclamation.
Elan aqueduct
The Elan aqueduct is a gravity-fed water-supply aqueduct carrying drinking water 73 miles from the Elan Valley Reservoirs in mid Wales to Frankley Reservoir in Birmingham, opened in 1906.
Elbtunnel
The Elbtunnel, officially the St. Pauli Elbtunnel and popularly called the Alter Elbtunnel, is a two-tube tunnel under the Elbe in Hamburg, opened in 1911 to carry harbor workers.
Electrodialysis
Electrodialysis is a membrane desalination process that transports salt ions through charged ion-exchange membranes under an electric field, best suited to brackish water rather than seawater.
Electronic distance measurement
Electronic distance measurement (EDM) determines the distance between two survey points from an electromagnetic wave, usually light or microwaves, propagated between them. Introduced commercially in 1950, it replaced taping and became standard in total stations.
Elephant Butte Reservoir
Elephant Butte Reservoir is an irrigation and hydropower reservoir on the Rio Grande in New Mexico, begun in 1915 as the centerpiece of the federal Rio Grande Project.
Eleutherna Bridge
Hellenistic corbel arch bridge at ancient Eleutherna (Ελεύθερνα), Crete, near Rethymno; limestone dry masonry, about 9 m long, 3.85 m span, damaged in 1883, preserved nearly complete.
Elio D'Appolonia
Elio D'Appolonia (1918–2015) was a Canadian-born American geotechnical engineer who founded the Pittsburgh consulting firm D'Appolonia in 1956 and was elected to the National Academy of Engineering in 1977.
Ellis Bridge
Ellis Bridge, officially renamed Swami Vivekanand Bridge, is a heritage steel truss bridge across the Sabarmati River in Ahmedabad, Gujarat, built in 1892 as a symbol of the city.
Elsinore Arch
Elsinore Arch, also called the Elsinore Tower, is a castellated limestone gateway in Cincinnati, Ohio, built in 1883 as a valve house and entrance to Eden Park.
Elwha Dam
The Elwha Dam was a 105-foot hydroelectric dam on the Elwha River on Washington's Olympic Peninsula, built from 1910 to 1913 and removed in 2012.
Elwha River dam removal project
The Elwha River dam removal project (2011–2014) demolished two hydroelectric dams on Washington's Olympic Peninsula, the largest dam removal in history, reopening over 70 miles of salmon habitat.