# Civil Engineering - Water Supply Engineering - Discussion

Discussion Forum : Water Supply Engineering - Section 1 (Q.No. 20)
20.
Pick up the correct statement from the following :
Detention period for plain sedimentation tanks ranges between 4 to 8 hours
Detention period for sedimentation tanks, using coagulants usually ranges between 2 to 4 hours
The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/minute
All the above.
Explanation:
No answer description is available. Let's discuss.
Discussion:
9 comments Page 1 of 1.

Mira said:   4 years ago
Detention period for plain sedimentation is 3 to 4 hr and for coagulated sedimentation is 2 to 2.5 hr.

The horizontal flow velocity in the sedimentation tank is limited to 0.3m/min.
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Kiran said:   4 years ago
Detention period: for plain sedimentation: 3 to 4 h, and for coagulated sedimentation: 2 to 2.5 h. Velocity of flow: Not greater than 30 cm/min (horizontal flow). Tank dimensions: L:B = 3 to 5:1.
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Kuntal meena said:   4 years ago
Plain sedimentation detention time 3-4 hrs and with coagulation 2-2.5 hrs and hrz. Velocity. 3 m/minute.

Spoo said:   4 years ago
0.3m/min is accurate.

Vivekanand pandey said:   5 years ago
For plane sedimentation td is 24 hrs.

Ajay said:   6 years ago
Dt for plain sedimentation is 3-4hr.

Vivek said:   7 years ago
According to me, it is The horizontally flow velocity in sedimentation tanks, is generally limited to 0.3 m/s not m/ min.
(1)

Hitler said:   7 years ago
All the given options are correct.

Dev said:   7 years ago
A and C are correct because detention period for water using coagulants is 2-6 hours.
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