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Drain-waste-vent system
The drain-waste-vent system, or DWV, is the gravity-fed pipe network that carries a building's wastewater to the sewer while venting drains to protect fixture traps.
Drainage
Drainage is the natural or engineered removal of surface water and excess groundwater from land and buildings, becoming urban drainage systems of gutters, sewers, and ponds in cities.
Drainage canal
Drainage canal: open artificial channel (open channel drainage, ICID) conveying excess water and storm runoff by gravity. Key facts: silting is the main maintenance problem, 2-3 year cleaning intervals, 70 cm/s self-cleansing velocity, debris blockage raises flood levels.
Drainage ditch
Drainage ditch: an open channel conveying excess water from farmland, roads, and development. Also called a swale when vegetated. Ancient origins in Mesopotamia; central to US farm drainage, erosion control, water quality, and ditch biodiversity.
Drainage law
Drainage law, also called land drainage law, is the body of property law governing landowners' rights over surface water flowing between parcels, resolved in the United States under three rules.
Drainage of the Fens
The drainage of the Fens transformed the Great Level of East Anglian fenland into farmland, financed by aristocratic Adventurers, engineered by Cornelius Vermuyden, and resisted by fen commoners.
Drainage water
Drainage water, or agricultural drainage, is excess water removed from farmland by surface or subsurface drains. It is normally saltier than irrigation supply, is reused for salt-tolerant crops, and carries nitrogen and selenium pollution.
Draisine
A draisine, also called a rail bike or velorail, is a small hand- or motor-powered rail vehicle used by railway workers for track inspection and maintenance.
Drake Hotel (Chicago)
The Drake Hotel is a historic luxury hotel on the Magnificent Mile in Chicago's Gold Coast, opened in 1920 and operated as a Hilton hotel today.
Drake Landing Solar Community
Drake Landing Solar Community is a 52-home subdivision in Okotoks, Alberta, heated by solar energy stored underground in boreholes, supplying over 90% of space heating from 2007 until 2024.
Draken International
Draken International is an American provider of contracted adversary air training, founded in 2011 by Jared Isaacman in Lakeland, Florida, flying ex-military fighters against US and NATO air forces.
DRAM-less SSD
A DRAM-less SSD is a solid-state drive without an onboard DRAM chip, storing its mapping table in NAND flash or host memory, costing 5 to 10% less.
DramaBox
DramaBox is a vertical short-drama streaming app run by StoryMatrix Pte. Ltd., Singapore, launched in 2023 and the top short-drama app by global in-app revenue in 2024.
Draper Laboratory
Draper Laboratory, formally The Charles Stark Draper Laboratory, is a Cambridge, Massachusetts nonprofit known for the Apollo guidance systems that took astronauts to the Moon.
Draugen Oil and Gas Field
Draugen is an oil field in the Norwegian Sea off Norway, discovered in 1984 and the first Norwegian field north of the 62nd parallel, producing since 1993.
Dravidian architecture
Dravidian architecture, also called South Indian temple architecture, is the Hindu temple style of southern India, defined by the pyramidal vimana tower and gopuram gateways.
DrawBench
DrawBench is a diagnostic benchmark of 200 English text prompts for evaluating text-to-image models, introduced in May 2022 alongside Google's Imagen model and still scored on leaderboards.
Drawbridge
A drawbridge is a movable bridge whose span opens to let boats and ships pass, most often meaning a bascule bridge; the term also covers swing and vertical lift bridges.
Drawing room
A drawing room, short for "withdrawing room", is a house room where visitors are received and entertained; it was the principal reception room in 18th- and 19th-century Britain.
Drawn textured yarn
Drawn textured yarn (DTY) is a polyester filament yarn made by drawing and false-twist texturing POY, giving it permanent crimp, bulk, and stretch for apparel and home textiles.
Drax Group
Drax Group is a British renewable energy company that owns Drax Power Station in North Yorkshire, which it describes as the UK's largest renewable power station.
Drax power station
Drax power station is a biomass-fired power station near Selby in North Yorkshire, England, operated by Drax Group and formerly the UK's largest coal-fired plant.
Drayage
Drayage, also called cartage or haulage, is the short-haul trucking of freight, typically containers, between an intermodal terminal such as a seaport and a nearby customer facility.
Drayton Hall
Drayton Hall is a historic Palladian plantation house on the Ashley River near Charleston, South Carolina, built between 1738 and 1742 for John Drayton, a National Historic Landmark.
DRB Class 42
The DRB Class 42 (PKP class Ty3 and Ty43) was a German heavy freight wartime steam locomotive of the Deutsche Reichsbahn, with 1,061 built from 1943 to 1949.
DRB Class 50
The DRB Class 50 (Baureihe 50, BR 50) was a German standard-design freight steam locomotive built from 1939 for the Deutsche Reichsbahn, with 3,164 examples built.
DRB Class 52
The DRB Class 52, also known as DRG BR 52, was a simplified German 2-10-0 wartime steam freight locomotive, of which about 7,000 were built from 1942.
DRDO AEW&CS
The DRDO AEW&CS, known in service as Netra, is India's indigenous airborne early warning and control system, built on Embraer EMB-145 jets for the Indian Air Force.
DRDO Close Quarter Battle carbine
The DRDO Close Quarter Battle (CQB) carbine is a 5.56×45 mm compact automatic carbine designed by India's DRDO and built by Bharat Forge for close combat and counter-terrorism.
DRDO Netra Mk2
The DRDO Netra Mk2, also written Netra Mk II, is an Indian airborne early warning and control aircraft built from six converted Airbus A321 airliners.