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Panama Canal expansion project
The Panama Canal expansion project, also called the Third Set of Locks, added a new lane of locks opened in 2016 to let larger Neopanamax vessels cross the canal.
Panama Canal locks
The Panama Canal locks are chamber systems that raise ships 26 meters to Gatun Lake using only gravity, with original locks from 1914 and new locks from 2016.
Panama Canal Zone
The Panama Canal Zone (Zona del Canal de Panamá) was a strip of US-governed territory in Panama, granted in 1903 and returned to Panamanian jurisdiction in 1979.
Panamax
Panamax is a ship-size class defined by the original Panama Canal locks, fitting vessels up to 965 feet long, and it remains a distinct, heavily traded class after the 2016 expansion.
Parakrama Samudra (පරාක්රම සමුද්රය)
Parakrama Samudra (පරාක්රම සමුද්රය), the "Sea of Parakrama," is an ancient irrigation reservoir at Polonnaruwa, Sri Lanka, built under King Parakramabahu I between 1153 and 1186.
Paramount Hotel explosion
The Paramount Hotel explosion was a natural gas explosion and fire that destroyed part of the Paramount Hotel in downtown Boston on January 28, 1966, killing 11 people.
Paris sewer system
The Paris sewer system is a network of about 2,600 kilometers of underground conduits that collects and evacuates the wastewater and rainwater of the French capital.
Paris sewers
The Paris sewers are the underground network collecting Paris's wastewater and rainwater in some 2,500 km of galleries, rebuilt by Eugène Belgrand from 1854 and partly open as a museum.
Paris water supply system
The Paris water supply system delivers drinking water to Paris, operated since 2010 by the public company Eau de Paris, drawing equally on groundwater and the Seine and Marne.
Parke County, Indiana
Parke County, Indiana, is a rural western Indiana county along the Wabash River, formed in 1821 and seat at Rockville, known for its 31 covered bridges.
Parsons Corporation
Parsons Corporation is an American technology and engineering company founded in 1944 in Los Angeles, headquartered in Chantilly, Virginia, serving the U.S. federal government and infrastructure customers worldwide.
Paul Fares Boulos
Paul Fares Boulos, also known as Paul F. Boulos, is a civil engineer born in Beirut who founded Innovyze and now chairs Aquanuity, elected to the National Academy of Engineering in 2014.
Pavement management system
A pavement management system (PMS) is a set of tools that helps road agencies plan and maintain pavement networks, recommending treatments so the network stays serviceable at least cost.
Pavement milling
Pavement milling, also called cold planing or asphalt milling, is a road-rehabilitation process in which a rotating cutter drum grinds away a controlled depth of old pavement for recycling.
Peace Bridge
The Peace Bridge is a toll bridge over the Niagara River connecting Buffalo, New York, with Fort Erie, Ontario. Opened in 1927, it is one of the busiest border crossings.
Peace Bridge (Foyle)
The Peace Bridge, Derry is an S-shaped pedestrian and cycle bridge over the River Foyle, opened in 2011 to link the city center with the Waterside.
Peachoid
The Peachoid is a 135-foot water tower in Gaffney, South Carolina, shaped and painted like a giant peach, holding one million gallons for Cherokee County.
Pearl Harbor Memorial Bridge (Connecticut)
The Pearl Harbor Memorial Bridge, informally the Q Bridge, carries Interstate 95 over New Haven Harbor in Connecticut and is the first extradosed bridge in the United States.
Pedestrian and cycle tunnels by region
Pedestrian and cycle tunnels by region surveys where tunnels for walkers and cyclists cluster, covering the 1950s-to-1970s subway boom, river crossings like Rotterdam's Maastunnel, and modern Nordic cycle tunnels.
Pedestrian bridges in the United States by state
Pedestrian bridges in the United States by state surveys how footbridges are defined, registered, counted, and funded across the states, drawing on the National Bridge Inventory, the National Register of Historic Places, and state inventories.
PEER Consultants
PEER Consultants, P.C. is an environmental engineering consulting firm founded in 1978 by Dr. Lilia A. Abron, a chemical and environmental engineer who leads it as president and CEO.
Pegasus Bridge
Pegasus Bridge is the Caen Canal bridge at Bénouville, Normandy, captured intact by Major John Howard's glider-borne British force in the opening minutes of D-Day, 6 June 1944.
Pelješac Bridge
The Pelješac Bridge (Pelješki most) is a 2,404 m cable-stayed road bridge in southern Croatia, opened in July 2022 to bypass Bosnia's Neum corridor with 85 percent EU funding.
Penang Bridge
The Penang Bridge (Jambatan Pulau Pinang) is a 13.5 km toll bridge in Malaysia linking Gelugor on Penang Island with Prai on the mainland, opened in 1985 as the island's first land link.
Pennsylvania Canal
The Pennsylvania Canal was a state-built system of canals and railroads whose Main Line linked Philadelphia and Pittsburgh, opening in 1834 as Pennsylvania's answer to New York's Erie Canal.
Pennsylvania county-numbered historic bridges
Pennsylvania county-numbered historic bridges are rural road bridges listed on the National Register under names like County Bridge No. 41, following a 1996 statewide inventory.
Penstock
A penstock is a pressurized closed conduit that carries water from a reservoir, canal, or surge tank to a hydroelectric turbine, usually made of steel for high heads.
Peristaltic pump
A peristaltic pump, also known as a hose pump or roller pump, is a positive displacement pump that moves fluid by rhythmically squeezing a flexible tube, so the fluid touches nothing but the tube.
Permeable paving
Permeable paving, also called porous pavement, lets rainwater pass through the surface into soil and gravel instead of running off; types include porous asphalt and pervious concrete.
Peter W. Barlow
Peter W. Barlow, also known as Peter William Barlow, was an English civil engineer who patented a cylindrical tunnelling shield in 1864, used in the Tower Subway.