Backpressure backflow is backflow caused by a downstream pressure that is greater than the upstream or supply pressure in a public water system or consumer's potable water system. Backpressure can result from an increase in downstream pressure, a reduction in the potable water supply pressure, or a combination of both.
Causes of increases in downstream pressure:
- Pumps (such as wells and booster pumps)
- Temperature increases in boilers, etc.
Causes of decreases in downstream pressure:
- Breaks in water mains
- Fire fighting
- Water line flushing
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