The detention period in a septic tank is generally assumed as:

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OSSC JE Civil Mains (Re-Exam) Official Paper: (Held On: 3rd Sept 2023)
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  1. 30 Minutes
  2. 15 Minutes
  3. 10 Minutes
  4. 5 Minutes

Answer (Detailed Solution Below)

Option 1 : 30 Minutes
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Explanation:
- The detention period refers to the time the wastewater remains in the septic tank for the solids to settle and the biological treatment to take place. 
- A detention period of 30 minutes is considered standard to allow for proper sedimentation and initial treatment before the effluent is discharged into the drain field.

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