2,617 articles
Pothole
A pothole is a bowl-shaped hole in a road pavement that grows under traffic and weather, a leading source of vehicle damage costing US motorists almost $3 billion a year.
Poulaphouca Reservoir
Poulaphouca Reservoir, locally called the Blessington Lakes, is an artificial lake in Counties Wicklow and Kildare, Ireland, created by damming the River Liffey in 1940.
Pounding (structural engineering)
Pounding, also called seismic pounding, is the collision of adjacent buildings during earthquake shaking when the separation gap between them is too small, causing damage or collapse.
Power Construction Corporation of China
Power Construction Corporation of China (POWERCHINA, 中国电力建设集团有限公司) is a wholly State-owned group founded in 2011 that builds hydropower projects including the Three Gorges and Baihetan stations.
Pozzolan
A pozzolan is a siliceous material with little cementitious value alone that reacts with calcium hydroxide and water to form cementitious compounds, improving concrete strength, impermeability, and durability.
Prado Dam
Prado Dam is a flood control dam on the Santa Ana River in Riverside County, California, built by the U.S. Army Corps of Engineers and completed in 1941.
Prague water-supply aqueducts
Prague's water-supply aqueducts are the conveyance lines built to bring drinking water to Prague, chiefly the 23 km Káraný pressure pipeline, officially opened in 1914.
Pratt truss
The Pratt truss is a bridge truss with diagonals in tension and verticals in compression, patented by Thomas and Caleb Pratt in 1844 and once the most common US bridge form.
Pre-modern dam construction techniques
Pre-modern dam construction techniques built water barriers of masonry, earth, and rock without concrete or steel, from the Jawa Dam of the mid-4th millennium BC onward.
Precast segmental construction
Precast segmental construction is a bridge-building method in which concrete segments cast in a plant are joined into a continuous span by post-tensioning, first used in Europe in the 1950s.
Prefabricated vertical drain
A prefabricated vertical drain (PVD) is a manufactured geosynthetic drain inserted into soft ground to shorten drainage paths and consolidation time, usually with a surcharge or vacuum preloading.
Prefabrication
Prefabrication, also called prefabricated construction, is a construction method in which components are manufactured under controlled conditions, then transported and assembled on site, as in immersed tube tunnels.
Premetro
A premetro is an urban transit system where trams run in tunnels built to allow later conversion to a full metro, notably in Brussels and Antwerp.
Primary treatment (sewage)
Primary treatment is the first stage of sewage treatment, a physical, non-biological process in tanks that removes floating and settleable solids after screening and grit removal.
Privatisation of the English water industry
The privatization of the English water industry transferred ten regional water authorities to private companies floated on 1 September 1989 under Margaret Thatcher's government, creating the regulator Ofwat.
Proceedings of the Institution of Civil Engineers
The Proceedings of the Institution of Civil Engineers is a family of 18 peer-reviewed civil engineering journals published by ICE Publishing, with a lineage dating to 1836.
Professional Engineer
A Professional Engineer (PE) is an engineer licensed by a government jurisdiction to prepare, sign, and seal engineering plans, a license created to protect public safety.
Professional Engineers Ontario
Professional Engineers Ontario (PEO) is the licensing and regulating body for professional engineering in Ontario, established in 1922 to serve and protect the public interest.
Progressive collapse
Progressive collapse is a structural failure mode in which an initial local failure, like loss of a column, spreads element to element, collapsing a building or disproportionately large part of it.
Progressive design–build
Progressive design–build (PDB) is a project delivery method in which an owner selects a design-builder on qualifications, then collaborates on scope and budget before the price is fixed.
Proposed subsea strait crossings
Proposed subsea strait crossings are road or rail tunnel megaprojects beneath sea straits that were seriously studied but mostly never built, covering Fehmarnbelt, Gibraltar, Messina, and Bering; only the Fehmarnbelt immersed tunnel is under construction.
Proposed tunnels in Africa
Proposed tunnels in Africa are tunnel schemes still at the study or concept stage, led by the Morocco–Spain rail tunnel under the Strait of Gibraltar, jointly studied since 1980.
Pseudo-dynamic testing
Pseudo-dynamic testing is an earthquake engineering method in which inertia and damping are modeled numerically while the restoring force is physically measured from a test specimen, allowing full-scale seismic testing without a shake table.
Ptolemaios/Traianos Potamos
Ptolemaios/Traianos Potamos, also Diôrus, was the ancient Nile-to-Red-Sea canal through Egypt's Wadi Tumilat, begun under Necho II and Darius I, restored by Ptolemy II and reworked by Trajan (98–117 CE), and used in Roman Indo-Mediterranean trade.
PUB, Singapore's National Water Agency
PUB, Singapore's National Water Agency, formally the Public Utilities Board, is the statutory board managing Singapore's whole water cycle, supplying water through the Four National Taps, including NEWater, and handling flood and coastal protection.
Public Health Act
The Public Health Act 1848 was the first general English sanitation statute, creating a General Board of Health and local boards for water supply, sewerage, and drainage.
Public Health Act 1875
The Public Health Act 1875 was a United Kingdom Act that consolidated English sanitary law, made previously optional duties compulsory, and served as the main public health framework until 1936.
Public Health Act 1936
The Public Health Act 1936 is a United Kingdom Act that consolidated public health law for England and Wales, replacing about 600 sections with roughly 350.
Public toilet
A public toilet, also called a public restroom or public washroom, is a toilet available to the general public in streets, parks, markets, and transit hubs.
Pueblo Grande Ruin and Irrigation Sites
Pueblo Grande Ruin and Irrigation Sites, or Pueblo Grande Museum Archaeological Park, is a National Historic Landmark in Phoenix, Arizona, preserving a Hohokam village and canals.