Asingle source of bod causes an oxygen sag curve with a minimum downstream do equal to 6.0 mg/l. if the bod of the waste is doubled, without increasing the waste flow rate, what would be the new minimum downstream do? in both cases, assume that the initial oxygen deficit just below the source is zero, and the saturated value of do is 10 mg/l. (note that the initial deficit is zero, therefore the deficit at any point is proportional to the initial bod)