Sump pump Total Dynamic Head — static lift plus pipe friction

Total Dynamic Head = static lift + pipe friction. Match your flow at that head to a pump curve — the box’s “max GPM” is at zero head.

Diagram of a sump pit and discharge path showing Total Dynamic Head. The pump lifts water vertically (static lift) from the basin to grade, then through a horizontal run with a check valve and elbows that add friction head. TDH equals static lift plus friction head, and the pump must deliver the design flow at that head on its performance curve — not the box’s zero-head maximum GPM. — Source: SSPMA / Hazen-Williams TDH method

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Diagram of a sump pit and discharge path showing Total Dynamic Head. The pump lifts water vertically (static lift) from the basin to grade, then through a horizontal run with a check valve and elbows that add friction head. TDH equals static lift plus friction head, and the pump must deliver the design flow at that head on its performance curve — not the box’s zero-head maximum GPM.

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