backflow


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Related to backflow: backflow valve

backflow

[′bak‚flō]
(civil engineering)
The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any other than its intended source.
(fluid mechanics)
Any flow in a direction opposite to the natural or intended direction of flow.

backflow

1. The flow of water or other liquids, mixtures, or substances into the distributing pipes of a potable supply of water from any other than its intended source. Also see back siphonage
2. Any flow in a direction opposite to the natural or intended direction of flow.
References in periodicals archive ?
The introduction of their Backflow Preventer Security Cage has proved to not only be a deterrent to theft, but also a long term money saver for property owners.
Backflow can occur because of a drop in pressure in the distribution system, such as when firefighters use the hydrant.
As the resin and fiber system have been assumed to act like a flow through a porous media, Darcy's law has been found to describe the flow behavior in the backflow region with good accuracy as compared to the hydrodynamic theory used by both Meyyappan and Gorthala.
The improvements were designed to reduce the risk of backflow into the temporary water system and into the rest of the fairground and Rochester municipal water supply during the remainder of the fair.
By examining and quantifying the rate of residential backflow occurrence we will be better able to determine if there are any associated public health risks.
Given this possibility for backflow and the potential for cross contamination with blood-borne pathogenic viruses and bacteria, the Centers for Disease Control and Prevention (CDC) recommends that patients not be instructed to close their lips around the SE tip during use.
That's because if you have underground irrigation lines, you also have a backflow preventer.
This former can portion over 10,000 pounds per hour with no product backflow, overworking or bridging.
Durable upstream and downstream PTFE-coated support screens preserve membrane integrity, especially in situations where fluid backflow could occur.
This year, the Checklist covers the latest information from the FPA on how and when to give tenants information about lead paint when renovating apartments and common areas, the new Fire Department rules requiring owners to prepare and distribute fire safety plans to occupants and employees, new DEP rules for installing and maintaining backflow prevention devices, and the new HPD regulations requiring the distribution of lead paint notices and pamphlets to new and renewing tenants, plus conducting annual apartment inspections for lead paint.
With gravel filters, self cleaners, elaborate and expensive experiments with hydraulics, aeration, pumps and backflow.
The backflow volume is an important parameter for mixing, and it is computed by integration of the axial (down channel) velocities over the part of the cross section where these velocities are negative.