The filtered water at peak hourly flow from a plant with coagulation, flocculation, and filtration has a pH of 7.5 and temperature of 15°C. The /10 in the clear well is 22 min, followed by transmission through a pipeline for 4000 ft at a velocity of 5 ft/sec before entering the distribution system. What free chlorine residual is required in the water at the outlet of the clear well and pipeline? (The loss of residual concentration is likely to be negligible during the transmission time in the pipeline.)
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