Enter the volume of the aeration tank (m^3) and the influent flow rate (m^3/s) into the Calculator. The calculator will evaluate the Hydraulic Retention Time.

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## Hydraulic Retention Time Formula

HRT = V/Q

Variables:

- HRT is the Hydraulic Retention Time (sec)
- V is the volume of the aeration tank (m^3)
- Q is the influent flow rate (m^3/s)

To calculate Hydraulic Retention Time, divide the volume of the aeration tank by the influent flor rate.

## How to Calculate Hydraulic Retention Time?

The following steps outline how to calculate the Hydraulic Retention Time.

- First, determine the volume of the aeration tank (m^3).
- Next, determine the influent flow rate (m^3/s).
- Next, gather the formula from above = HRT = V/Q.
- Finally, calculate the Hydraulic Retention Time.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

volume of the aeration tank (m^3) = 800

influent flow rate (m^3/s) = 20