Civil Engineering - Water Supply Engineering - Discussion

26. 

Normal values of overflow rate for plain sedimentation tank using coagulants, is

[A]. 750 to 1000 litres/hr/m2
[B]. 1000 to 1250 litres/hr/m2
[C]. 1250 to 1500 litres/hr/m2
[D]. 1500 litres/hr/m2.

Answer: Option B

Explanation:

No answer description available for this question.

Mayank said: (Nov 30, 2016)  
I think it should be 1250 -1500.

Avi said: (Jun 20, 2018)  
12000 - 18000 lit per day per m2.

Ujjwal said: (Jan 16, 2020)  
Please, anyone, explain the correct answer.

Hisham said: (Feb 20, 2020)  
1000-1250 as per SK Garg.

Jingusie said: (Mar 4, 2020)  
Type 1:- 12-18m^3 per day per m^2.
Type 2:- 24-30m^3 per day per m^2.

Besu said: (Jul 17, 2020)  
12000-18000 lt/m2/day.
So, the answer should be - 500-750 lt/m2/Hr.

Zenu said: (Oct 20, 2020)  
Surface overflow rate for Plain sedimentation tank = 12000 to 18000 lit/day/m2.

SOR for plain sedimentation with coagulation=24000 to 30000 lit/day/m2. Cover it to hours, we get 24000/24 lit/hr/m2= 1000.

Similarly, for 30000/24 = 1250 lit/hr/m2.

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