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Sewage Ejector Flow and Basin Cycling Calculator

Compare actual pump delivery with design inflow, useful basin volume and documented cycling limits; calculate required working volume from the full range.

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Inputs that matter
Pump, basin and design basis, Design maximum inflow (US gal/min), Pump delivery at actual TDH (US gal/min), Net working volume between on/off levels (US gal), and 3 more
Output to expect
Sewage ejector flow and basin cycling
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Sewage ejector flow and basin cycling

Compare documented pump delivery at the actual total dynamic head with design inflow and net working basin volume. Evaluate the shortest cycle for inflows from zero through the entered design maximum. Use the exact pump’s permitted starts and minimum runtime.

Fill minutes = working gal / inflow gpm; run minutes = working gal / (pump gpm − inflow gpm). The maximum starts occur at min(design inflow, pump flow/2).

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 56.25 worst-case starts/hour · more working volume required

FAQ

Compare documented pump delivery at the actual total dynamic head with design inflow and net working basin volume. Evaluate the shortest cycle for inflows from zero through the entered design maximum. Use the exact pump’s permitted starts and minimum runtime.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Sewage Ejector Flow and Basin Cycling Calculator

Compare documented pump delivery at the actual total dynamic head with design inflow and net working basin volume. Evaluate the shortest cycle for inflows from zero through the entered design maximum. Use the exact pump’s permitted starts and minimum runtime.