Detention Time Calculator
Calculate the hydraulic detention time (detention volume / flow rate) for water treatment basins and tanks.
Calculation Parameters
Input your parameters below.
Calculated Result
Expert Tip
Make sure all values are in the correct units to ensure mathematically precise chemical results.
How this Calculator Works
This calculator allows you to solve Detention Time problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Tank / Basin Volume (V, m³) (Range: 10 to 5000, Default: 500)
- Influent Flow Rate (Q, m³/h) (Range: 1 to 250, Default: 50)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
Where:
- Tank / Basin Volume: Parameter value.
- Influent Flow Rate: Parameter value.
Step-by-Step Calculation Example
To calculate Detention Time manually, follow these steps:
- Identify the input parameters. For example:
- Tank / Basin Volume (V, m³) = 500
- Influent Flow Rate (Q, m³/h) = 50
- Apply the formula:
θ = V / Q
- Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is detention time in water treatment? ▼
Detention time is the average theoretical duration liquid remains inside a settling tank or clarification basin.
What is the formula for detention time? ▼
Detention Time (hours) = Basin Volume (m³ or gal) / Influent Flow Rate (m³/hr or GPH).
Why is detention time critical for chemical flocculation? ▼
Adequate detention time ensures complete chemical mixing and gravity settling of suspended particulate flocs.