2,617 articles
Reservoirs of Spain
Reservoirs of Spain, called embalses in Spanish, are artificial lakes impounded by dams on Spanish rivers; Spain leads the EU with more than 1,200 large dams holding about 56,000 hm³.
Reservoirs of the Alps
Reservoirs of the Alps are high-altitude impounding basins that store meltwater in summer and release it through turbines to generate hydroelectricity during the winter peak in demand.
Reservoirs of West and Central Asia
The reservoirs of West and Central Asia are artificial lakes behind dams storing seasonal river flow for irrigation, water supply, and hydropower, mostly built since the 1950s.
Resilient modulus
The resilient modulus (MR) is the ratio of applied cyclic stress to recoverable strain in unbound pavement materials and subgrade soils, the key material input in modern pavement design.
Response modification factor
The response modification factor (R) is a seismic engineering coefficient that reduces elastic design forces for a structure's ductility, overstrength, and redundancy, first codified in the ATC-3-06 report of 1978.
Response spectrum
A response spectrum is a plot of the maximum acceleration, velocity, or displacement of damped oscillators excited by an earthquake, and underlies every modern seismic design code.
Retaining wall
A retaining wall is a structure built to hold back soil or other material at a difference in elevation, resisting the lateral pressure of the ground behind it.
Retention basin
A retention basin, also known as a retention pond, wet pond, or stormwater management pond, is a pond that permanently holds water and treats urban stormwater runoff.
Retractable bridge
A retractable bridge, also called a thrust or traversing bridge, is a movable bridge whose deck rolls back from the navigation gap rather than lifting, swinging, or curling aside.
Reuben Samuels
Reuben Samuels was an American geotechnical and underground-construction engineer who spent over 30 years at Crimmins Constructors before joining Parsons Brinckerhoff in New York in 1992.
Reverse osmosis
Reverse osmosis is a water purification process in which pressure drives water through a semipermeable membrane while dissolved salts are retained. It is the dominant technology for seawater desalination.
Revetment
A revetment is a sloping facing of erosion-resistant material such as stone or concrete that protects shorelines, riverbanks, and embankments against erosion, lying on the slope itself.
Rhine–Main–Danube Canal
The Rhine–Main–Danube Canal (Main-Donau-Kanal) is a 171-kilometer canal in Bavaria, Germany, built between 1960 and 1992 to link the Main and Danube, completing a 3,500-kilometer waterway from the North Sea to the Black Sea.
Rialto Bridge
The Rialto Bridge (Ponte di Rialto) is the oldest stone bridge over Venice's Grand Canal, a single white arch designed by Antonio da Ponte and finished in 1591.
Ribblehead Viaduct
Ribblehead Viaduct, officially Batty Moss Viaduct, is a 24-arch railway viaduct in North Yorkshire, England, built 1870 to 1875 for the Settle to Carlisle Railway.
Rice Terraces of the Philippine Cordilleras
The Rice Terraces of the Philippine Cordilleras are living, hand-built rice terraces in the Cordillera mountains of Luzon, Philippines, worked by the Ifugao people and inscribed by UNESCO in 1995.
Richard J. Robbins
Richard James Robbins (1933–2019) was an American engineer who led The Robbins Company for 35 years, refined the tunnel boring machine, and held 67 patents.
Richard L. Tomasetti
Richard L. Tomasetti is an American structural engineer who co-founded Thornton Tomasetti, chaired it until 2007, and led the engineering of Taipei 101 and the Petronas Towers.
Richard Redmayne
Sir Richard Augustine Studdert Redmayne (1865–1955) was a British mining engineer, the UK's first Chief Inspector of Mines, who led the 1913 Senghenydd disaster inquiry.
Richmond–San Rafael Bridge
The Richmond–San Rafael Bridge, officially the John F. McCarthy Memorial Bridge, is a double-deck cantilever toll bridge carrying Interstate 580 between Richmond and San Rafael, opened in 1956.
Rideau Canal
The Rideau Canal is a 202 km waterway in eastern Ontario linking Ottawa to Kingston, built between 1826 and 1832 under Lieutenant-Colonel John By and now a UNESCO World Heritage Site.
Ringedals Dam
Ringedals Dam (Ringedalsdammen) is a concrete gravity dam at the head of Ringedalsvatnet in Skjeggedal, above Tyssedal in Vestland, Norway. Built 1910–1918 for the Tysso I hydroelectric plant, it was Norway's largest dam when completed.
Rio Grande diversion canals
The Rio Grande diversion canals are irrigation canals in New Mexico and west Texas, belonging to the Middle Rio Grande Conservancy District and the federal Rio Grande Project.
Rio Grande Project
The Rio Grande Project, also called the Rio Grande Reclamation Project, is a US Bureau of Reclamation irrigation and power project on the Rio Grande in New Mexico and west Texas.
Rio–Antirrio Bridge
The Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου), officially the Charilaos Trikoupis Bridge, is a cable-stayed road bridge in Greece linking Rio on the Peloponnese with Antirrio, inaugurated in 2004.
Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου)
The Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου), officially the Charilaos Trikoupis Bridge, is a cable-stayed bridge near Patras, Greece, opened in 2004 to link the Peloponnese with the mainland.
Rio–Niterói Bridge
The Rio–Niterói Bridge (Ponte Rio–Niterói) is a box girder bridge crossing Guanabara Bay, connecting Rio de Janeiro and Niterói. Inaugurated in 1974, it carries the BR-101 highway.
Riprap
Riprap, also called shot rock or rock armor, is a layer of large loose stone or concrete blocks placed to protect soil from erosion by water.
Riqueval Tunnel
The Riqueval Tunnel (souterrain de Riqueval), also called the Grand Souterrain, is a 5,670-meter navigable canal tunnel on the Canal de Saint-Quentin in northern France, opened in 1810.
Rivers and Harbors Act
The Rivers and Harbors Act names a series of United States federal statutes, beginning in 1824, that fund navigable water improvements, with the 1899 act still governing obstructions and refuse in navigable waters.