Worksheet 4 – Calculate detention times
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1.
Calculate the detention time for the tank rectangular sedimentation tank with the following
dimensions, length is 20m, width is 10m, depth is 4m, and the flow rate is 0.25m3 per sec.
2.
Calculate detention time for the same tank when the flow rate is reduced to 0.1m3 per sec.
3.
Calculate detention time for the same tank when the flow rate is increased to 2m3 per sec.
Worksheet 4 – Calculate detention times
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Answers
1.
53 minutes, 20 seconds
2.
2 hours, 13 minutes, 20 seconds
3.
6 minutes, 40 seconds
Worksheet 4 – Calculate detention times
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