2,617 articles
Petit Saut Dam
The Petit Saut Dam is a hydroelectric dam on the Sinnamary River in French Guiana, commissioned in 1994 and supplying about two thirds of the territory's electricity.
Philadelphia Water Works
The Philadelphia Water Works is the municipal water supply system Philadelphia began operating in 1801, one of the first city-owned systems in the United States.
Philipsdam
The Philipsdam is a 7-kilometer dam in the Netherlands, part of the Delta Works flood-defense system, built between 1976 and 1987 to separate the freshwater Volkerak-Zoommeer from the saltwater Oosterschelde.
Photo-Fenton oxidation
Photo-Fenton oxidation is an advanced oxidation process for water treatment that combines iron, hydrogen peroxide, and UV or sunlight to generate hydroxyl radicals degrading organic pollutants.
Pick–Sloan Missouri Basin Program
The Pick–Sloan Missouri Basin Program, authorized by the Flood Control Act of 1944, merged the Army's Pick Plan and the Bureau of Reclamation's Sloan Plan for the Missouri River basin.
Piedras Negras, Coahuila
Piedras Negras, also called Ciudad Porfirio Diaz, is a city in Coahuila, Mexico, on the Rio Grande across from Eagle Pass, Texas, founded in 1850.
Piercebridge Roman Bridge
Piercebridge Roman Bridge: remains of a Roman bridge carrying Dere Street over the River Tees at Piercebridge, County Durham/North Yorkshire. Two bridges existed; the stone-piered second, built early 3rd century, was found in 1972 and is a scheduled monument.
Pierre Charles L'Enfant
Pierre Charles L'Enfant, also known as Peter L'Enfant, was a French-born architect and engineer who served in the Continental Army and designed the 1791 plan for Washington, D.C.
Pile driving analyzer
A pile driving analyzer (PDA) measures force and acceleration at a pile head during hammer impact, estimating pile bearing capacity, driving stresses, and hammer performance.
Pile foundation
A pile foundation is a deep foundation that uses long, slender piles to carry structural loads through weak surface soils down to stronger soil or rock.
Pilot tunnel
A pilot tunnel, also called a pilot drift, is a small tunnel excavated ahead of a larger tunnel to explore ground conditions and assist final excavation.
Pine Flat Dam
Pine Flat Dam is a 429-foot-high concrete gravity dam on the Kings River in Fresno County, California, built by the Army Corps of Engineers and completed in 1954.
Pipe (fluid conveyance)
A pipe is a hollow cylinder, usually rigid, that conveys fluids such as water, gas, sewage, or oil; pipes are sized by nominal diameter, unlike tubes.
Pipe jacking
Pipe jacking is a trenchless construction method in which hydraulic jacks push prefabricated pipes through the ground between shafts, typically for sewers and utility crossings under roads and railways.
Pipe network analysis
Pipe network analysis, also known as pipe networks, calculates flow rates and pressures in interconnected pipe systems; its governing equations are nonlinear and solved iteratively, as in software like EPANET.
Pipeline leak detection
Pipeline leak detection is the set of technologies and methods for establishing whether a pipeline carrying water, oil, or gas is leaking, often locating the leak.
Piping and internal erosion
Piping and internal erosion is the process by which seepage through an embankment dam or levee carries away soil particles, forming erosion channels that can cause breach.
Piping and plumbing fitting
A piping and plumbing fitting, also known as a pipe fitting, is a component that connects, redirects, branches, reduces, or terminates pipe and tubing in fluid systems.
Piston effect
The piston effect is the airflow a moving train forces through a railway tunnel, pushing air ahead of it and drawing air behind; it ventilates subway stations without fans.
Planning Techniques
Planning techniques: structured methods (MBO, PERT, PPBS, Delphi, scenario construction, comparison matrix, MCA, decision analysis) for setting goals, generating alternatives, and evaluating options in organizations, urban planning, and AI planning.
Plastic hinge
A plastic hinge is a localized yielding zone in a structural member that rotates like a hinge at constant moment, underlying plastic analysis of steel and concrete frames.
Plate girder bridge
A plate girder bridge is a steel bridge supported by built-up I-shaped girders made from welded or riveted plates, widely used for spans of roughly 30 to 100 m.
Plover Cove Reservoir (船湾淡水湖)
Plover Cove Reservoir (船湾淡水湖) is an impounding reservoir in northeastern Hong Kong, completed in 1968 as the world's first reservoir built in the sea and Hong Kong's second largest.
Plumbing
Plumbing is the work or business of installing pipes, fixtures, and apparatus in buildings for bringing in water supply and removing liquid and water-borne wastes.
Plunge pool
A plunge pool is a basin that receives a free-falling jet from a dam spillway or outlet and dissipates its energy, protecting the riverbed from scour.
Pluvial flooding
Pluvial flooding, also called surface water flooding, happens when rainfall exceeds the infiltration capacity of soil or the capacity of drainage systems, producing overland flow and ponding.
Polavaram Project (పోలవరం ప్రాజెక్టు)
The Polavaram Project (పోలవరం ప్రాజెక్టు), also called Polavaram Dam, is a multi-purpose irrigation project under construction on the Godavari river at Polavaram in Andhra Pradesh, India.
Polder
A polder is low-lying land enclosed by dikes, with its water level controlled by sluices and pumping stations; polders cover roughly half the Netherlands, reclaimed since the 12th century.
Pondel
Pondel (Pont d'Aquel), a single-arch masonry aqueduct bridge in the Cogne Valley of Italy, was built in 3 BC and financed by Paduan entrepreneur Caius Avillius Caimus.
Pong Dam
Pong Dam, also called Beas Dam, is an embankment dam on the Beas River in Kangra district, Himachal Pradesh, India, completed in 1974 with a 396 MW powerhouse.