You are currently viewing How to Calculate Detention Time – Water Treatment Math

How to Calculate Detention Time – Water Treatment Math

Today, we’re going to look at how to calculate Detention Time, the theoretical value of how long water stays in a process or in a tank before flowing out.  Watch the video below and learn how this type of water math problem is solved.

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Detention Time Definitions:

  • The theoretical (calculated) time required for a given amount of water or wastewater to pass through a tank at a given rate of flow.
  • The time required to fill a tank at a given flow.
  • The actual time in hours, minutes, or seconds that a small amount of water is in a settling basin, flocculating basin, or rapid-mix chamber.
  • In storage reservoirs, detention time is the length of time entering water will be held before being drafted for use (several weeks to years, several months being typical).

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