Question 2002 of 229 · California Water Distribution Operator Exam
Back-siphonage occurs when which condition exists in the supply piping?
Exactly one answer is correct.
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Correct answer to question 2002
- C: The supply pressure drops below atmospheric pressure, creating a vacuum
Explanation
A main break or heavy fire flow can cause negative pressure that draws water from a connected source into the system. Higher downstream pressure describes back-pressure instead.
More questions: Distribution System Design and Hydraulics
- 2003Back-pressure backflow occurs when:
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- 2006Which assembly is generally required to protect the public water supply from a high-hazard cross-connection that may see back-pressure?
- 2007A garden hose submerged in a bucket of fertilizer solution and connected to a hose bib is an example of what?
- 2008How often must testable backflow prevention assemblies be tested in California?