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GATE Civil Engineering (CE) 2018 Shift 2 Solved Paper

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Question : 48

Total: 65

At a small water treatment plant which has 4 filters, the rates of filtration and backwashing are 200m3/d/m2 and 1000m3/d/m2 respectively. Backwashing is done for 15 min per day. The maturation, which occurs initially as the filter is put back into service after cleaning, takes 30 min. It is proposed to recover the water being wasted during backwashing and maturation. The percentage increase in the filtered water produced (up to two decimal places) would be______

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