2,617 articles
National Water Supply and Drainage Board
The National Water Supply and Drainage Board (NWSDB) is the principal statutory authority for safe drinking water and sanitation in Sri Lanka, established in January 1975.
NATM in soft ground
NATM in soft ground, known in the United States as the Sequential Excavation Method (SEM), applies the New Austrian Tunnelling Method's sequential excavation with sprayed-concrete lining to soils such as clays, silts, and sands.
Navajo Dam
Navajo Dam is a Bureau of Reclamation earthfill dam on the San Juan River in northeastern New Mexico, built between 1958 and 1963 to impound Navajo Reservoir.
Naviduct
A naviduct is a navigable aqueduct with shipping locks built into the waterway itself, so road traffic passes beneath. The only one, at Enkhuizen in the Netherlands, opened in 2003.
Navigable aqueduct
A navigable aqueduct, also called a canal aqueduct, is a bridge that carries a canal with its water and boats over an obstacle, letting vessels cross without locks.
Navigation canal
Navigation canal: artificial waterway built to carry boats and ships, joining rivers, lakes, or seas. Uses locks, summit-level water supplies, and checks; examples include the Erie, Suez, and Panama canals.
Navigation dam
A navigation dam is a low dam built across a navigable river to impound a pool deep enough for barge traffic, with gates holding the water level nearly constant.
Nazca culture
The Nazca culture, also spelled Nasca, was a pre-Columbian society on Peru's south coast from about 100 BC to AD 700, known for polychrome ceramics and the Nazca Lines.
Negative skin friction
Negative skin friction (NSF) is the downward shear force settling soil exerts on a pile shaft, typically from consolidating soft clay, fill, or groundwater lowering.
NEHRP Recommended Seismic Provisions
The NEHRP Recommended Seismic Provisions, commonly the NEHRP Provisions, is a US technical resource document setting minimum seismic design requirements for new buildings, first published in 1985 and developed by the BSSC for FEMA.
Nero Decree
The Nero Decree, also known as the Nerobefehl, was a March 1945 order by Adolf Hitler directing the destruction of German infrastructure as Allied forces advanced.
Neutrality of the Panama Canal
The neutrality of the Panama Canal is a treaty-based regime keeping the Canal open to vessels of all nations equally, established by the 1977 Torrijos–Carter Treaties.
New Austrian tunneling method
The New Austrian tunneling method (NATM) is a tunnel construction method that mobilizes the self-supporting capacity of the ground, using a monitored shotcrete shell and rock bolts.
New Bridge (near Harrogate)
New Bridge (near Harrogate): Grade II listed 1822 packhorse bridge over the River Nidd at Birstwith, North Yorkshire, on the Otley-to-Ripon packhorse track; single round arch, 20 m span; distinct from New Bridges at Ripon, Studley Royal, and Harewood.
New Bridge (near Oxford, 1004851)
New Bridge (scheduled monument 1004851) is a 14th-century six-arch limestone bridge over the Thames at Newbridge between Northmoor and Kingston Bagpuize near Oxford, Grade I listed and the most complete medieval bridge in Oxfordshire.
New Bridge (near Oxford, 1368023)
New Bridge (Historic England list entry 1368023) is a Grade I listed 1773 road bridge by Sir William Chambers over the River Glynne at Blenheim Palace, Oxfordshire; limestone ashlar, three semi-circular arches, distinct from medieval Newbridge on the Thames.
New Bridge (near Plymouth)
New Bridge (Gunnislake Bridge), Grade I listed circa 1520 granite bridge of six arches, 55 m long, over the River Tamar between Gunnislake, Cornwall and Gulworthy, Devon near Plymouth; lowest Tamar bridge before 1859.
New Civil Engineer
New Civil Engineer is a British civil engineering magazine and website published by EMAP as the official magazine of the Institution of Civil Engineers since 1972.
New Croton Dam
New Croton Dam, also called the Cornell Dam, is a large masonry dam on the Croton River in Westchester County, New York, built from 1892 to 1906.
New Engineering Contract
The New Engineering Contract (NEC) is a family of standard-form contracts for works, services, and supply, published by the Institution of Civil Engineers since 1993.
New Orleans levee system
The New Orleans levee system is the network of levees, floodwalls, and pump stations protecting New Orleans, first begun in 1717 and rebuilt after Hurricane Katrina in 2005.
New River (London)
The New River is an artificial watercourse built between 1608 and 1613 under Sir Hugh Myddelton, carrying spring water from Hertfordshire to the City of London.
New River Company
The New River Company was an English water supply company, incorporated in 1619, that built and operated the New River carrying water to London until 1904.
New River Gorge Bridge
The New River Gorge Bridge is a steel arch bridge carrying US 19 near Fayetteville, West Virginia; opened in 1977, it was the world's longest steel arch span until 2003.
New Valley Project (مشروع الوادي الجديد)
The New Valley Project (مشروع الوادي الجديد), also called the Toshka project, is an Egyptian land reclamation program channeling Lake Nasser water into desert farmland.
New York City Department of Bridges
The New York City Department of Bridges was the municipal agency responsible for the city's bridges from 1898 to 1916, building the Williamsburg, Manhattan, and Queensboro Bridges.
New York City Department of Environmental Protection
The New York City Department of Environmental Protection is the agency that supplies over 1 billion gallons of drinking water daily to nine million New Yorkers and treats the city's wastewater.
New York City steam system
The New York City steam system is a Con Edison district steam network serving over 1,500 Manhattan buildings, begun in 1882 and the largest in the United States.
New York City water supply system
The New York City water supply system is a network of 19 reservoirs and aqueducts delivering about 1 billion gallons of drinking water daily to 9.5 million people.
New York City Water Tunnel No. 3
New York City Water Tunnel No. 3 is a 60-mile drinking water tunnel built beneath New York City since 1970 as a backup for Tunnels No. 1 and No. 2.