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Robert F. Mast
Robert F. Mast was an American structural engineer who spent fifty years at BERGER/ABAM Engineers in Washington, led precast concrete design, and died in 2020.
Robert S. O'Neil
Robert S. O'Neil (1935–2021) was an American civil engineer who served as Chief Engineer on the Washington Metrorail and was elected to the National Academy of Engineering.
Robert Stephenson
Robert Stephenson (1803–1859) was an English railway and civil engineer, George Stephenson's only son, chief engineer of the London and Birmingham Railway and inventor of the wrought-iron tubular bridge.
Rochdale Canal
The Rochdale Canal is a 33-mile broad canal in northern England crossing the Pennines from Manchester to Sowerby Bridge; opened in 1804, it closed in 1937 and reopened in 2002.
Rock bolt
A rock bolt, also called a roof bolt, is a steel or composite rod anchored in drilled rock with a plate to reinforce tunnels, mines, slopes, and dams.
Rock mass rating
The rock mass rating (RMR) system, also called the Geomechanics Classification, rates a rock mass from 0 to 100 using six parameters, guiding tunnel support, mining, slope, and foundation design.
Rock-fill dam
A rock-fill dam is an embankment dam built mainly of quarried rock, made watertight by an earth core, concrete face, or asphaltic membrane, and favored for seismic sites.
Rogfast
Rogfast is a 26.7 km subsea road tunnel under construction in Rogaland, Norway, carrying the E39 under the Boknafjorden; when it opens in 2033 it will be the world's longest and deepest subsea road tunnel.
Rogue River Basin Project
The Rogue River Basin Project is a federal irrigation and hydropower project in southwestern Oregon, whose Talent Division, built by the Bureau of Reclamation, was authorized in 1954.
Rogun Dam
Rogun Dam is a 335-meter dam under construction on the Vakhsh River in Tajikistan, expected to become the world's tallest when completed, with a 3,600 MW hydropower plant.
Roller-compacted concrete
Roller-compacted concrete (RCC), also known as rollcrete, is a dry, zero-slump concrete placed in layers with earthmoving equipment and compacted by vibratory rollers, widely used for concrete gravity dams and heavy-duty pavements.
Roller-compacted concrete dam
A roller-compacted concrete dam is a concrete gravity dam built by placing dry concrete in horizontal layers compacted with vibratory rollers, cutting costs 25 to 40 percent.
Rolling lift
Rolling lift is a bascule bridge where the span rolls along a curved track rather than pivoting, as in the design patented by William Scherzer in 1893.
Roman aqueduct
A Roman aqueduct was a channel, tunnel, or pipeline that carried water by gravity from springs to Roman towns, chiefly for public baths and drinking fountains.
Roman bridge
Roman bridge: stone-arch bridges built by Roman engineers along the empire's road network, also called pontes. Over 300 major examples, built mainly in the 1st century BC and early 2nd century AD, using the voussoir arch, concrete, and cofferdam foundations; Alcántara, Mérida, and Trajan's Danube bridge are famous cases.
Roman bridge at Buonfornello
Roman bridge at Buonfornello (Ponte Grande), an ancient stone bridge of seven piers and eight arches crossing the Imera river in Sicily on the via Valeria, probably 1st century BC, collapsed by the 16th century and eliminated in 1960-70 river works.
Roman bridge at Habitancum
Roman bridge at Habitancum (Risingham), Northumberland: Dere Street's crossing of the River Rede beside the Habitancum fort (HER 7947). Bridge-works noted by Hodgson in 1824; post-Roman river action removed most remains.
Roman Bridge at Moulin de Boisseron
Roman Bridge at Moulin de Boisseron (Pont romain de Boisseron): 1st-century AD, Tiberian-era Roman road bridge over the Bénovie at Boisseron, Hérault, France; five semicircular arches, 50.60 m long, widened 1833-36, classified monument historique 2008.
Roman bridge at Valeriana
The Roman bridge at Valeriana was a Roman bridge over the Danube at the ford between Dolni Vadin, Bulgaria, and Grojdibodu, Romania, built under Emperor Domitian during the Dacian war.
Roman bridge of San Vito
Roman bridge of San Vito (Ponte romano di San Vito, Pontaccio): ruined Roman bridge near Rimini, Italy, carrying the Via Emilia over the Uso river, probably Augustan, tied to the Rubicon question and redeveloped in 2022.
Roman bridge, Mérida
Roman bridge, Mérida (Puente Romano sobre el Guadiana): Augustan-era Roman bridge at Augusta Emerita, Spain; 792 m, 60 semicircular arches, granite ashlar over concrete, pedestrian since 1993, UNESCO-listed.
Roman bridge, Pietralunga di Paternò
Roman bridge, Pietralunga di Paternò (Ponte romano di Pietralunga): ruined two-arched Roman lava-stone bridge over the Simeto at Paternò, Catania, Sicily; about 23 m long, 4.15 m wide, on the Catania-Centuripe-Enna road.
Roman dams
Roman dams are water-retaining structures built across the Roman and early Byzantine world from the 1st century BC, concentrated in Spain, North Africa, and the Near East.
Roman irrigation in North Africa
Roman irrigation in North Africa was the system of dams, terraces, cisterns, and foggaras that made the arid region a major grain and olive supplier to Rome.
Roman irrigation in Spain
Roman irrigation in Spain comprised dam-fed canals, estate waterworks, and legally organized irrigation communities in Hispania, distinct from urban aqueducts, with channels still functioning today.
Roman irrigation in the Levant
Roman irrigation in the Levant was a set of runoff-harvesting, floodwater-farming, and qanat systems in the Negev, southern Jordan, and Syria, from the first century BCE to the eighth century CE.
Roman roads
Roman roads were the paved routes built by the Roman state from 312 BCE, when the Via Appia linked Rome to Capua, eventually spanning nearly 300,000 kilometers.
Roof garden
A roof garden, or rooftop garden, is a garden built on a building's roof, either in containers or as an engineered green roof that reduces urban stormwater runoff.
Room for the River (Netherlands)
Room for the River (Ruimte voor de Rivier) is a Dutch flood-protection program that gives rivers more space rather than raising dikes, running from 2006 to 2019.
Roseires Dam
The Roseires Dam, also written Er Roseires Dam, is a dam on the Blue Nile in Sudan, built from 1961 to 1966 for irrigation and 280 MW hydropower.