Question: a rapid gravity filter has dimensions 4 . 5 7 2 m by 9 . 1 4 4 m . After filtering 9 4 6

a rapid gravity filter has dimensions 4.572 m by 9.144 m . After filtering 9463.52 m^3 in a 24 hr period, the filter is backwashed at a rate of 0.0101 m^3/s/m^2 for 12 minutes. Calculate the average filtration rate and the quantity and percent of treated water used in backwashing the filter.

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