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Desalination plant intake and outfall engineering
Desalination plant intake and outfall engineering designs the systems that bring raw seawater into a plant and return concentrated brine, covering up to 20% of facility capital cost.
Design and performance of immersed tube tunnels
Design of immersed tube tunnels must keep prefabricated elements buoyant during installation but permanently submerged, with watertight joints, seismic resilience, and accommodation of settlement in soft alluvial soils.
Design flood
A design flood is the flood magnitude a hydraulic structure or protected area is designed to accommodate safely, stated as a peak flow, volume, or water level.
Design speed
Design speed is a selected speed used to determine the geometric design features of a roadway, first proposed in 1936 and defined by AASHTO's Green Book since 2001.
Design storm
A design storm is a hypothetical rainfall event of specified depth, duration, and probability, defined for designing drainage and flood control infrastructure rather than from a real storm.
Design–bid–build
Design–bid–build, or DBB, is a construction project delivery method where design and construction are sequential and contracted separately, the traditional method for US public works.
Design–build
Design–build, or design and build, is a project delivery method in which a single entity holds one contract with the owner for both design and construction.
Destruction of the Kakhovka Dam
The destruction of the Kakhovka Dam, also called the Nova Kakhovka dam collapse, was the catastrophic breach of the dam at Nova Kakhovka, Ukraine, on 6 June 2023.
Detention basin
A detention basin is an engineered depression that temporarily stores stormwater runoff and releases it slowly through a controlled outlet, reducing downstream peak flows and flooding.
Detention dam
A detention dam is a dam built to hold floodwater temporarily and release it at a controlled rate, rather than to store water permanently for supply or power.
Deterioration modeling
Deterioration modeling, also called infrastructure deterioration modeling, uses statistical, probabilistic, and physical models to predict how infrastructure, most commonly highway bridges, declines over time, guiding maintenance and budget planning in systems like Pontis.
Detroit Dam
Detroit Dam is a concrete gravity dam on the North Santiam River about 45 miles east of Salem, Oregon, built by the Army Corps of Engineers between 1949 and 1953.
Detroit International Bridge Company
The Detroit International Bridge Company is a private, for-profit Michigan corporation that owns the United States side of the Ambassador Bridge, the toll crossing between Detroit and Windsor, Ontario.
Development-induced displacement
Development-induced displacement is the forced movement of people from their homes, land, or livelihoods caused by development projects such as dams, mines, roads, and urban infrastructure.
Devil's Bridge
Devil's Bridge is the name of many European bridges tied to a legend that the devil built the bridge in exchange for a soul, then was cheated.
Dew
Dew is water in the form of droplets that condenses from atmospheric water vapor onto surfaces cooled overnight below the air's dew point, most often on vegetation and soil.
Dhola–Sadiya Bridge
The Dhola–Sadiya Bridge, officially Bhupen Hazarika Setu, is a 9.15 km beam bridge over the Lohit River linking Dhola in Assam with Sadiya, inaugurated in May 2017.
Diamer-Bhasha Dam
The Diamer-Bhasha Dam is an under-construction gravity dam on the Indus River in northern Pakistan, designed to store 8.1 MAF of water and generate 4,500 MW.
Diaphragm pump
The diaphragm pump, also called a membrane pump, is a positive displacement pump that moves fluid by flexing a flexible membrane, handling corrosive and hazardous media without leakage.
Dike ring
A dike ring (dijkring) is a closed system of dikes, dunes, dams, or high ground in the Netherlands protecting an area from flooding as one unit.
Direct potable reuse
Direct potable reuse is the introduction of highly treated reclaimed wastewater directly into a drinking water system without an environmental buffer, pioneered in Windhoek, Namibia, in 1968.
Directional boring
Directional boring, also called horizontal directional drilling (HDD), is a trenchless method for installing underground pipes, conduits, and cables, used beneath rivers, roads, and railroads.
Disc cutter
A disc cutter is a rolling cutting tool mounted on a tunnel boring machine cutterhead, whose hardened steel ring crushes rock into chips under high pressure.
Disinfection by-products
Disinfection by-products (DBPs) are contaminants formed when disinfectants such as chlorine react with organic matter in drinking water; the US EPA limits trihalomethanes and haloacetic acids.
Dismal Swamp Canal
The Dismal Swamp Canal is a 22-mile artificial waterway from Deep Creek, Virginia, to South Mills, North Carolina, dug largely by enslaved labor, opened in 1805, and still operating today.
Disney utilidor system
The Disney utilidor system, or Utilidors, is a network of utility corridors beneath Walt Disney World's Magic Kingdom where cast members and supplies move out of guest view.
Distilled water
Distilled water is water purified by boiling it into vapor and condensing the vapor back to liquid, leaving dissolved salts, minerals, and most contaminants behind.
Diversion dam
A diversion dam, also called a diversionary dam, is a low barrier across a river that raises the water level to divert flow into canals or ditches for irrigation.
Dnieper Hydroelectric Station
Dnieper Hydroelectric Station, also known as DniproHES, is a hydroelectric dam on the Dnieper River at Zaporizhzhia, Ukraine, built in 1927–1932 as the showpiece of Soviet electrification.
Dnieper reservoir cascade
The Dnieper reservoir cascade, also called the Dnipro Cascade of Hydroelectric Stations, is a chain of six reservoirs on the Dnipro River in Ukraine, built between 1932 and 1976.