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.

## 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.

1. First, determine the volume of the aeration tank (m^3).
2. Next, determine the influent flow rate (m^3/s).
3. Next, gather the formula from above = HRT = V/Q.
4. Finally, calculate the Hydraulic Retention Time.
5. 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