Verify the inputs
Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.
Wastewater/ CALCULATOR
Sump pit storage and pump cycling
Estimate active pit volume, fill time, drain time and starts per hour from measured levels and flows.
FROM ESTIMATE TO ACTION
Use the result, not just the number.
Keep the calculation traceable
Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.
Confirm the decision
Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.
Inputs to verify
- Inside pit diameter (cm)
- Measure the clear internal diameter.
- Pump-on to pump-off level difference (cm)
- Use the observed vertical travel between control levels.
- Observed water inflow (L/min)
- Estimate during a representative wet condition.
- Delivered pump flow (L/min)
- Use measured discharge flow at the real head, not a free-flow maximum.