1423. The overflow rate for plain sedimentation tanks is about__________________?

A. 500 to 750 litres/hour/ m2
B. 1000 to 1250 litres/hour/ m2
C. 1250 to 1500 litres/hour/m2
D. 1500 to 2000 litres/hour/m2
✅ The correct answer is option A.

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