2,617 articles
Seongsu Bridge (성수대교)
The Seongsu Bridge (성수대교) is a road bridge across the Han River in Seoul whose 1994 collapse killed 32 people and prompted South Korea's infrastructure safety reforms.
Seoul waterworks
Seoul waterworks (서울 상수도) is the municipal system treating and piping drinking water in Seoul, South Korea, begun in 1908 and reaching full coverage in the 1990s.
Separate sewer system
A separate sewer system collects wastewater and stormwater in two distinct pipe networks: sanitary sewers send sewage to treatment, and storm sewers carry runoff to waterways.
Septic drain field
A septic drain field, also called a leach field, is the part of an onsite septic system where perforated pipes release effluent into soil that filters it before it reaches groundwater.
Septic tank
A septic tank is a buried, water-tight container that treats household wastewater on site, settling solids as sludge, floating grease as scum, and draining effluent to a soil drainfield.
Sepulveda Dam
Sepulveda Dam is a 1941 flood-control dam on the Los Angeles River in the San Fernando Valley, built and operated by the U.S. Army Corps of Engineers.
Sequencing batch reactor
A sequencing batch reactor (SBR) is a wastewater treatment process in which aeration, reaction, settling, and decanting occur sequentially in one tank, treating municipal and industrial wastewater.
Seth L. Pearlman
Seth L. Pearlman is an American geotechnical engineer who led Menard's North American ground improvement business and was elected to the National Academy of Engineering in 2024.
Sethusamudram Shipping Canal Project
The Sethusamudram Shipping Canal Project, an Indian scheme studied since 1860, would link the Palk Strait with the Gulf of Mannar so ships could avoid circumnavigating Sri Lanka.
Setting out (construction)
Setting out, called layout in US usage, establishes marks and lines defining the position and level of construction elements, transferring design dimensions from drawings onto the ground.
Seven Mile Bridge
The Seven Mile Bridge is a 6.79-mile highway bridge in the Florida Keys carrying the Overseas Highway (US 1); the modern bridge opened in 1982 and remains Florida's longest.
Severn Bridge
The Severn Bridge (Pont Hafren) is a suspension bridge carrying the M48 across the Severn Estuary between Aust, Gloucestershire, and Beachley near Chepstow, opened in 1966.
Severn Trent
Severn Trent is a publicly listed water and wastewater company whose main subsidiary supplies drinking water to over eight million people in the Midlands and mid-Wales.
Severn Tunnel
The Severn Tunnel (Twnnel Hafren) is a railway tunnel under the River Severn between Wales and England, opened in 1886 and Britain's longest until 2007.
Sewage
Sewage, also known as municipal or domestic wastewater, is the spent water supply of a community, roughly 99% water, collected by sewerage systems and treated before discharge.
Sewage sludge
Sewage sludge is the semi-solid residue of municipal and industrial wastewater treatment, containing organic matter, nutrients, and microorganisms; treated sludge applied to land is called biosolids.
Sewage sludge treatment
Sewage sludge treatment, also called sludge treatment, is the set of processes that reduce volume, destroy pathogens, and prepare sewage sludge for land application, landfilling, or incineration.
Sewage treatment
Sewage treatment, also known as wastewater treatment, removes pollutants from wastewater from homes and businesses before release into local waterways, protecting public health and clean water.
Sewer and drainage tunnels
Sewer and drainage tunnels are underground civil-engineering tunnels built to convey, store, or transfer sewage and stormwater, ranging from Bazalgette's London sewers of the 1860s to the Thames Tideway Tunnel.
Sewer system failures and overflows
Sewer system failures and overflows occur when wastewater networks fail to convey sewage to treatment, releasing untreated waste through combined and sanitary sewer overflows, backups, or collapses.
Sewerage
Sewerage, also called a sewage system, is the entire infrastructure that collects, treats, and disposes of wastewater, as distinct from the individual sewers that make it up.
Shadoof
A shadoof, also spelled shaduf or shadouf (شادوف), is a human-powered water-lifting lever with a counterweight and bucket, used since ancient times to raise Nile water for irrigation.
Shafdan
Shafdan (Hebrew: שפדן), formally the Dan Region Wastewater Treatment and Reclamation Project, is Israel's largest wastewater treatment plant, serving about 2.5 million people near Tel Aviv.
Shake table
A shake table, or shaking table, is a hydraulically or electromagnetically driven platform that reproduces recorded earthquake ground motions so structures and equipment can be tested under controlled seismic loading.
Shape factor (plastic design)
The shape factor of a structural cross section is the ratio of its plastic to its elastic section modulus, a purely geometric property independent of material strength.
Shasta Dam
Shasta Dam is a 602-foot concrete gravity dam on the Sacramento River near Redding, California, built by the Bureau of Reclamation from 1938 to 1945 and impounding Shasta Lake.
Shasta Lake
Shasta Lake is the reservoir impounded by Shasta Dam on the Sacramento River northwest of Redding, California, and the largest reservoir in California, holding 4,552,000 acre-feet.
Shear center
The shear center, also called the flexural center or center of twist, is the point in a beam cross-section where a transverse load produces bending without twisting.
Shenzhen–Zhongshan Link
The Shenzhen–Zhongshan Link (深中通道), also called the ShenZhong Link, is a 24-kilometer cross-sea highway across the Pearl River estuary connecting Shenzhen and Zhongshan, Guangdong, opened June 30, 2024.
Shield drive operation: steering, grouting and settlement control
Shield drive operation is the phase of shield tunnelling in which a tunnel boring machine is steered along its alignment, with grouting and monitoring controlling settlement.