2,617 articles
Rain gutter
A rain gutter, also called an eavestrough in Canada, is a channel along a roof's eaves that collects runoff and carries it through downspouts away from walls and foundations.
Rainbow Bridge (Niagara Falls)
The Rainbow Bridge is an international steel arch bridge connecting Niagara Falls, New York, with Niagara Falls, Ontario. Completed in 1941, it replaced the ice-destroyed Honeymoon Bridge.
Rainwater harvesting
Rainwater harvesting, also called rainwater collection or rainwater catchment, is the collection of rainwater from roofs and catchments for storage and later use, practiced for millennia and used today for both water supply and stormwater management.
Raising of Chicago
The Raising of Chicago was a public works program begun in 1855 that raised city streets several feet and lifted buildings to install the first US sewer system.
Raising of dams
Raising of dams, also called dam heightening or crest raising, is the modification of an existing dam to increase its crest elevation, enlarging reservoir storage or restoring flood safety.
Rana Pratap Sagar Dam
Rana Pratap Sagar Dam is a 54 m masonry dam on the Chambal River at Rawatbhata in Kota district, Rajasthan, India, part of the Chambal Valley project.
Rapid sand filter
A rapid sand filter, also called a rapid gravity filter, passes chemically pre-treated water downward through coarse sand at high rates, typically 5 to 15 m³/m²/h, and is cleaned by backwashing.
Ras Al-Khair Power and Desalination Plant
The Ras Al-Khair Power and Desalination Plant is a large hybrid power and water complex on Saudi Arabia's Gulf coast that supplies desalinated water to Riyadh.
Rebar
Rebar, short for reinforcing bar and also called reinforcing steel, is a steel bar embedded in concrete to carry tensile loads, used in bridges, buildings, and foundations.
Reclaimed water
Reclaimed water, also known as recycled water or wastewater reuse, is water from sinks, showers, and industry that is treated and used again for irrigation, industrial supply, or even drinking water.
Reconstruction after the Great Kantō earthquake
Reconstruction after the Great Kantō earthquake, known as the Imperial Capital Reconstruction, rebuilt Tokyo and Yokohama after the September 1923 disaster under Home Minister Gotō Shinpei.
Red Hill water crisis
The Red Hill water crisis was the November 2021 contamination of the U.S. Navy's drinking water at Joint Base Pearl Harbor-Hickam, Hawaii, affecting about 93,000 people.
Redridge Steel Dam
The Redridge Steel Dam is a decommissioned steel gravity dam across the Salmon Trout River in Houghton County, Michigan, built in 1901 to supply water for copper stamp mills.
Reef Island (Bahrain)
Reef Island (جزيرة ريف), formerly Lulu Island, is a luxury freehold artificial island off Manama, Bahrain, with about 1,217 apartments, 65 villas, and a five-star resort.
Regent's Canal
Regent's Canal is an 8.5-mile canal in London running from Paddington to Limehouse on the River Thames, authorized in 1812 and opened in two stages between 1816 and 1820.
Regulation and licensure in engineering
Regulation and licensure in engineering is the system by which governments decide who may practice engineering, led by the Professional Engineer license, first granted under a 1907 Wyoming law.
Regulation of the Tisza
The Regulation of the Tisza (Tisza-szabályozás) was a 19th-century engineering program, launched in 1846 under Count István Széchenyi, that straightened the Tisza River across the Great Hungarian Plain.
Reinforced concrete
Reinforced concrete, or ferro-concrete, is a composite building material in which embedded steel bars carry the tension that concrete cannot resist, used in roads, bridges, and buildings.
Reinhard Woltman
Reinhard Woltman (also spelled Woltmann), born 1757 and died 1837, was a German hydraulic engineer who directed all of Hamburg's water engineering and invented the Woltman Flügel current meter for measuring flow in open channels.
Rendsburg High Bridge
The Rendsburg High Bridge (Rendsburger Hochbrücke) is a steel cantilever railway bridge at Rendsburg, Germany, built between 1911 and 1913 to carry trains over the Kiel Canal.
Rendsburg Transporter Bridge
The Rendsburg Transporter Bridge (German: Schwebefähre) is a passenger-and-vehicle gondola suspended beneath the Rendsburg High Bridge, a railway viaduct over the Kiel Canal, opened in 1913 and unique worldwide.
Renewable energy in Turkey
Renewable energy in Turkey is electricity and heat from hydropower, solar, wind, geothermal, and biomass, supplying 43.3% of electricity in 2025, led by hydropower and record solar and wind growth.
Reservoir
A reservoir, also called a storage reservoir, is a lake, often man-made behind a dam, storing water for public supply, irrigation, flood control, and power.
Reservoir-induced seismicity
Reservoir-induced seismicity, also called reservoir-triggered seismicity, is earthquake activity caused by filling artificial reservoirs; the largest case was the magnitude 6.5 Koyna earthquake in India in 1967.
Reservoirs Act 1975
The Reservoirs Act 1975 is a UK law regulating the safety of large raised reservoirs in England and Wales through registration, inspection, and supervision by qualified civil engineers.
Reservoirs in Germany
Reservoirs in Germany are impounded by 530 operating dams, 266 of them large dams, led by Saxony with 190 and used mainly for flood control, recreation, and energy.
Reservoirs in the Czech Republic
The reservoirs of the Czech Republic are artificial lakes impounded by dams across the country's rivers, including 115 large reservoirs; the largest, Orlík, holds 720 million m³.
Reservoirs of East Asia
The reservoirs of East Asia are dominated by China's roughly 98,000 reservoirs, the world's largest system with about 980 km³ of storage, led by Three Gorges.
Reservoirs of New Zealand
The reservoirs of New Zealand are impounded water bodies built for hydroelectricity storage, measured in gigawatt-hours rather than volume, with almost all controllable storage in the South Island.
Reservoirs of Southeast Asia
Reservoirs of Southeast Asia covers impounding reservoirs for water supply and storage across the region, where 186 large reservoirs hold about 175 cubic kilometers, led by Thailand's Srinagarind and Bhumibol.