Estimate the designed discharge for a combined system in DOHA community of 90,000 persons where water consumption to be

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Estimate the designed discharge for a combined system in DOHA
community of 90,000 persons where water consumption to be 200 LPCD;
and 80% of the water consumption goes to the sewer (considering the
peak factor of 2.1). The catchment area is 121 hectares and the
average Coefficient of runoff is 0.60. The time of concentration
for the design rainfall is 30 min and the relation between
intensity of rainfall and duration is I = 1020/(t + 20). Estimate
the average and maximum hourly flow into these combined sewer where
maximum flow is 3 times higher than average flow.