The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be

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• A slow sand filter is cleaned if its filter head is higher than
• In a rapid sand filter, air binding is caused due to excessive
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• In trickling filter, B.O.D. is reduced to
• In trickling filter, B.O.D. is reduced to
• In a rapid gravity filter
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• The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by
• If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by