The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
A. 0.2 to 0.4
B. 0.4 to 1.0
C. 2 to 4
D. 5 to 7
Answer: Option C
This Question Belongs to Civil Engineering >> Environmental Engineering
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The distribution mains are designed for
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C. Average daily demand
D. Maximum hourly demand on maximum day
Sewage treatment units are designed for
A. Maximum flow only
B. Minimum flow only
C. Average flow only
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A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0
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