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Sasanian defense lines
The Sasanian defense lines were linear walls, canals, and fortifications built by the Sasanian Empire of Iran (224–651) against nomads from the north and Arab tribes.
Saudi Binladin Group
Saudi Binladin Group is a Jeddah-headquartered Saudi construction conglomerate founded by Mohammed Binladin in 1931, best known for expanding the Two Holy Mosques in Mecca and Medina.
Saugatuck River Bridge
The Saugatuck River Bridge, officially the William F. Cribari Memorial Bridge, is an 1884 wrought iron swing bridge carrying Route 136 over the Saugatuck River in Westport, Connecticut.
SawTeen See
SawTeen See is a structural engineer known for supertall buildings, who co-founded Leslie E. Robertson Associates and led the structural design of the 679-m Merdeka 118 Tower.
Scaffolding
Scaffolding is a temporary elevated platform with its supporting structure, used to support workers and materials during construction, maintenance, or repair, and is either supported or suspended.
Scherzer rolling lift
A Scherzer rolling lift is a movable bascule bridge whose span rolls backward on curved segmental girders as it opens, patented by William Donald Scherzer in 1893.
Schmertmann method
The Schmertmann method is a semi-empirical procedure for estimating settlement of shallow foundations on sand using cone penetration test data, introduced by John H. Schmertmann in 1970.
Schoharie Creek Bridge collapse
The Schoharie Creek Bridge collapse was the 1987 failure of an I-90 bridge near Amsterdam, New York, where floodwater scour dropped spans into the creek, killing 10.
Scottish Water
Scottish Water is the publicly owned water and wastewater utility of Scotland, created in 2002, supplying drinking water and treating wastewater for over 5.2 million people.
Scour protection
Scour protection is the set of engineering measures that prevent or limit erosion of sediment around structures founded in water, most commonly around offshore wind turbine foundations and bridge piers.
Seattle Underground
The Seattle Underground is a network of buried storefronts and sidewalks beneath Pioneer Square in Seattle, Washington, left behind when the streets were raised after the Great Seattle Fire of 1889.
Seawall
A seawall is a rigid coastal defense structure, typically concrete, stone, or steel, built parallel to the shore to protect land behind it from wave attack, erosion, and flooding.
Second Severn Crossing
The Second Severn Crossing, officially the M4 Prince of Wales Bridge, is a road bridge carrying the M4 motorway across the River Severn between England and Wales.
Secondary treatment
Secondary treatment is the stage of wastewater treatment that uses biological processes, usually aerobic microorganisms, to remove dissolved and finely suspended organic matter left after primary settling, chiefly by activated sludge and trickling filters.
Sedapal
Sedapal (Servicio de Agua Potable y Alcantarillado de Lima) is Peru's state-owned water and sewerage utility, the sole authorized provider in metropolitan Lima and Callao since 1981.
Sediment flushing
Sediment flushing is a reservoir management operation in which low-level outlets in a dam are opened so flowing water carries deposited sediment downstream, recovering storage lost to sedimentation.
Sedimentation (water treatment)
Sedimentation in water treatment is a solid-liquid separation process in which suspended particles settle by gravity in a quiescent basin, used for clarification in drinking water and wastewater plants.
See Robertson Structural Engineers
See Robertson Structural Engineers is a consulting structural engineering firm co-founded in 2018 in Foster City, California, by SawTeen See and Leslie E. Robertson, designing and peer-reviewing structures rather than constructing them.
Seepage analysis
Seepage analysis is the geotechnical method that models water flow through soil and rock in embankment dams, levees, and foundations, computing flow rates, hydraulic gradients, and pore water pressures.
Segmental bridge
A segmental bridge, also called a segmental concrete bridge, is a concrete bridge whose deck is built from short segments joined by post-tensioning, first used in Europe in the 1950s.
Segmental lining (tunnel)
A segmental lining is a tunnel wall built from precast reinforced-concrete segments erected ring by ring behind a tunnel boring machine, serving as the permanent support of shield-driven tunnels.
Seikan Tunnel (青函トンネル)
The Seikan Tunnel (青函トンネル) is a 53.85 km railway tunnel crossing the Tsugaru Strait to connect Japan's islands of Honshu and Hokkaido, opened in March 1988.
Seismic isolation bearing
A seismic isolation bearing is a device between foundation and superstructure that allows relative motion during earthquakes while dissipating energy, lengthening the vibration period to reduce seismic forces.
Seismic metamaterials
Seismic metamaterials are engineered periodic structures built in soil or at building bases that block or redirect seismic waves, demonstrated at full scale near Grenoble in 2012.
Selective withdrawal
Selective withdrawal is the extraction of fluid from one chosen depth of a density-stratified body of fluid, most commonly water from a stratified reservoir through a multilevel outlet.
Self-anchored suspension bridge
A self-anchored suspension bridge is a suspension bridge whose main cables anchor to the stiffening girder itself, eliminating massive ground anchorages and suiting spans of roughly 100–400 m.
Self-consolidating concrete
Self-consolidating concrete (SCC), also called self-compacting concrete, is highly flowable, nonsegregating concrete that fills formwork without vibration; it was developed in Japan in the late 1980s.
Self-healing concrete
Self-healing concrete (SHC) is concrete engineered to repair its own cracks without human intervention, through intrinsic chemistry or added bacteria, microcapsules, or vascular networks that release healing compounds.
Semmering Base Tunnel
The Semmering Base Tunnel (German: Semmering-Basistunnel) is a 27.3 km twin-tube railway tunnel under construction between Gloggnitz and Mürzzuschlag, Austria, with final breakthrough in 2024 and opening planned for 2029.
Senegal River Basin Development Authority
The Senegal River Basin Development Authority, known in French as the OMVS, is an intergovernmental organization created in 1972 by Mali, Mauritania, and Senegal to jointly develop the Senegal River basin.