For maximum discharge through a chimney the condition is that height of hot gas column producing the draught should be

Two times the height of chimney

Four times the height of chimney

¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Low estimates of the average and maximum flows

Large scale infiltration of storm water

Unexpected increase in population

Unexpected large scale infiltration of stream water

Unexpected increase in the population

Under estimates of maximum and average flows

low estimates of the average and maximum flows

large scale infiltration of storm water

unexpected increase in population

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