2,617 articles
McAlpine Locks and Dam
McAlpine Locks and Dam, also known as McAlpine Dam, is a U.S. Army Corps of Engineers lock and dam complex on the Ohio River at Louisville, Kentucky.
Mechanically stabilized earth
Mechanically stabilized earth (MSE) is a geotechnical construction method that reinforces compacted soil with steel strips or geosynthetics to build retaining walls and bridge abutments.
Mechanistic-empirical pavement design
Mechanistic-empirical pavement design is a pavement engineering method that computes stresses and strains in a trial road structure, then predicts distresses like rutting and cracking over time.
Medieval dams of Yemen and the Maghreb
The medieval dams of Yemen and the Maghreb were small gravity dams, weirs, and earthen embankments built under Islamic rule after the Marib Dam's decline.
Megaproject
A megaproject, also called a gigaproject or megainfrastructure, is an extremely large investment project, typically over $1 billion, common in energy, transport, and water infrastructure.
Megastructure
A megastructure is an architectural concept in which one very large structural frame houses a city's buildings, transportation, and public facilities, coined by Fumihiko Maki in 1964.
Mekong Project
The Mekong Project was a United Nations program launched in 1957 to develop the water resources of the Lower Mekong Basin for Cambodia, Laos, Thailand, and South Viet Nam.
Mekong River Commission
The Mekong River Commission (MRC) is an intergovernmental organization founded in 1995 by Cambodia, Laos, Thailand, and Viet Nam to coordinate sustainable management of the lower Mekong River.
Mekorot
Mekorot (מקורות) is Israel's national water company, founded in 1937, which supplies 80 percent of the country's drinking water and operates the National Water Carrier.
Melbourne Water
Melbourne Water is the Victorian government-owned corporation managing Greater Melbourne's water storages, drinking water supply, sewerage, drainage, and flood control, formed from the Melbourne and Metropolitan Board of Works in 1991.
Membrane bioreactor
A membrane bioreactor, also called a membrane biological reactor, is a wastewater treatment process that combines activated sludge with membrane filtration, replacing the secondary clarifier.
Membrane distillation
Membrane distillation is a thermally driven desalination process in which water vapor passes through a hydrophobic microporous membrane; it runs at ambient pressure on low-temperature heat such as waste heat or solar energy.
Membrane theory (structures)
Membrane theory is a simplified structural theory for thin shells in which loads are carried entirely by in-plane forces, with no bending moments; it is the standard first analysis for domes and pressure vessel heads.
Menai Suspension Bridge
The Menai Suspension Bridge (Pont Grog y Borth) is an iron suspension bridge over the Menai Strait in north Wales, designed by Thomas Telford and opened in 1826.
Merowe Dam
The Merowe Dam is a hydropower dam on the Nile River at the fourth cataract in northern Sudan, completed in 2009 with a capacity of 1,250 MW.
Metal-organic framework water harvesting
Metal-organic framework water harvesting is atmospheric water harvesting in which porous MOF crystals capture water vapor even in dry desert air, then release it when heated or exposed to sunlight.
Method of joints
The method of joints is a classical hand method of truss analysis that finds the axial tension or compression in every member by solving equilibrium equations joint by joint.
Method of sections
The method of sections is a structural analysis technique that finds forces in specific truss members by passing an imaginary cut through the truss and applying the equations of equilibrium to one side.
Metro Tunnel
The Metro Tunnel, also called the Melbourne Metro Rail Project, is a pair of 9-kilometer rail tunnels under Melbourne opened in 2025, with five new underground stations.
Metro-2
Metro-2 (Метро-2), reportedly designated D-6 in Soviet times, is an alleged secret underground railway beneath Moscow said to connect the Kremlin with deep bunkers and Vnukovo airport.
Metropolitan Board of Works
The Metropolitan Board of Works (MBW) was the principal local government body for London from 1855 to 1889, built Bazalgette's main drainage system and the Thames embankments, and was replaced by the London County Council.
Metropolitan Commission of Sewers
The Metropolitan Commission of Sewers administered London's sewers outside the City from 1847 to 1855, employing Joseph Bazalgette before the Metropolitan Board of Works replaced it.
Metropolitan Water Board (London)
The Metropolitan Water Board was a public body created by the Metropolis Water Act 1902 to buy out London's private water companies, purchasing eight of them for £43 million.
Metropolitan Water District of Southern California
The Metropolitan Water District of Southern California, or MWD, is a public regional water wholesaler founded in 1928 that supplies imported water to nearly 19 million people.
Metropolitan Water Reclamation District of Greater Chicago
The Metropolitan Water Reclamation District of Greater Chicago (MWRD), established in 1889, treats wastewater and manages stormwater in Cook County, Illinois, and reversed the Chicago River in 1900.
Metropolitan Waterworks Authority
The Metropolitan Waterworks Authority (Thai: การประปานครหลวง) is a Thai state enterprise, created by legislative act in 1967, that produces and distributes potable water to Bangkok, Nonthaburi, and Samut Prakan, serving more than 12 million people.
Mettur Dam (மேட்டூர் அணை)
Mettur Dam (மேட்டூர் அணை) is a masonry gravity dam on the Kaveri River at Mettur in Tamil Nadu, India, completed in 1934 to irrigate the Thanjavur delta.
Mexico City water supply system
The Mexico City water supply system delivers water to over 20 million people, relying on wells and the Cutzamala inter-basin transfer while losing about 40% to leaks.
Mexico–United States border wall
The Mexico–United States border wall (barrera México–Estados Unidos) is a series of fences and barriers along the US–Mexico border, begun in the 1990s to curb unauthorized immigration and smuggling.
Miasma theory
Miasma theory, or the miasma theory of disease, was the medical doctrine that epidemics are caused by bad air from rotting matter, dominant until germ theory replaced it in the late 1800s.