Question 2005 of 229 · California Water Distribution Operator Exam
Under the State Water Board's Cross-Connection Control Policy Handbook, what is the minimum vertical air-gap separation between the supply outlet and the flood level of the receiving vessel?
Exactly one answer is correct.
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Correct answer to question 2005
- D: At least twice the effective opening of the supply, and never less than 1 inch
Explanation
The handbook defines an air-gap separation as a vertical separation of at least two times the effective opening of the supply pipeline, and in no case less than 1 inch. Smaller gaps can allow splashing or siphoning to bridge the space.
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