Hydraulic retention time

The hydraulic retention time (HRT), also known as hydraulic residence time or t (tau), is a measure of the average length of time that a compound (ex. water) remains in a storage unit (ex. lake, pond, ocean).

Hydraulic retention time is the volume of the storage unit divided by the influent flowrate:

$HRT = \frac{Volume\; of\; aeration\; tank}{influent\; flowrate}$

where using SI Units Volume is in [m³] and Influent flowrate is in [m³/h]. HRT is usually expressed in hours (or sometimes days).

Calculate HRT

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