While designing a blower for backwash for sand filters without air scouring what

Question

While designing a blower for backwash for sand filters without air scouring what is the velocity considered?

Options:

A . 36 m/h

B . 30 m/h

C . 24 m/h

D . 20 m/h

Answer: Option A
Answer: (a).36 m/h

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