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Water Distribution Operator Class II Practice Questions - ABC WPI Water Distribution Operator Class II Certification Exam

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During a hydrant flow test, the static pressure at the test hydrant is 70 psi and the residual pressure with the flow hydrant open is 50 psi. The flow hydrant is discharging 800 gpm. Using Q20 = Qf × ((Hs − 20)/(Hs − Hr))^0.54, what is the available flow at 20 psi residual?
Correct Answer:
About 1,400 gpm

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