How to use this tool

Enter tank volume and flow rate using the displayed units.
Choose Calculate to divide volume by flow rate.
Review the result, unit basis, source, and scope limitations.

Formula and units

Detention time = tank volume ÷ flow rate. Keep all flow values on the same time basis and use the displayed units.

Scope and limitations

This is a screening calculation from your inputs. It does not select design criteria, account for hydraulics, settling behavior, short-circuiting, peak factors, safety factors, or regulatory compliance. Confirm design decisions with applicable permits, standards, and a qualified wastewater professional.

Source

Reference: U.S. EPA, Wastewater Technology Fact Sheet and design guidance: https://19january2021snapshot.epa.gov/sites/static/files/2019-12/documents/activated_sludge_process_control_and_troubleshooting_manual.pdf

Local processing

Inputs stay in your browser; no values are uploaded.

GOOD TO KNOW

Common questions

Does this choose a design value?

No. It applies the stated formula to your inputs only.

Are inputs uploaded?

No. Calculation runs locally in your browser.