As Total Dynamic Head (TDH) increases, what happens to gallons per minute (GPM)?

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Prepare for the Sewer Collection Systems Operator Test. Study with multiple choice questions, each with hints and explanations. Ensure success on your exam!

Multiple Choice

As Total Dynamic Head (TDH) increases, what happens to gallons per minute (GPM)?

Explanation:
Total Dynamic Head represents the resistance the pump must overcome, including lift, friction in pipes and fittings, and velocity losses. As that resistance goes up, the pump can push out less water because more of its energy is used to overcome the head rather than to move water at a high rate. So the gallons per minute decreases when TDH increases. In a real system, raising head does not cause flow to increase or stay the same; the pump’s performance curve shows a downward trend: higher head means lower flow.

Total Dynamic Head represents the resistance the pump must overcome, including lift, friction in pipes and fittings, and velocity losses. As that resistance goes up, the pump can push out less water because more of its energy is used to overcome the head rather than to move water at a high rate. So the gallons per minute decreases when TDH increases. In a real system, raising head does not cause flow to increase or stay the same; the pump’s performance curve shows a downward trend: higher head means lower flow.

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