Rain falls uniformly at a rate of 50 mm/h for 1 hour on a 40 ha watershed which comprises 10 ha having C = 0.3; 10 ha with C = 0.4; and 20 ha with C = 0.6. Calculate the peak rate of runoff assuming a time of concentration of 1 hour.

If the time of concentration is 45 minutes, what will be the peak discharge? Plot a hydrograph for this storm.