Backflow: A reverse flow condition, created by a difference in water pressures, which causes water to flow back into the distribution pipes of a potable water supply from any source or sources other than an intended source.
backflow prevention device Any approved device, method, or type of construction intended to prevent backflow into a waterworks. See backflow.
Backflow: The flow of water in a medium in a direction opposite to normal flow. Flow is often returned into the system by backflow, if the wastewater in a purification system is severely contaminated.
BACKFLOW PREVENTION: Prevention of the flow of any foreign liquids, gases, or substances into the distribution pipelines of a potable water supply; accomplished by an air gap or mechanical backflow obstacle.
the backflow of contaminated or polluted water, from a plumbing fixture or cross-connection into a water supply line, due to a lowering of the pressure in the line.
Pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.
Reverse seepage of water in a distribution system.
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of a shaft (such as an impeller shaft).
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back pressure. A pressure that can cause water to backflow
into the water supply when a user's water system is at a ...
 See also: Condition, Concentration, Water supply, Organism, Contaminant
  
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