A storm gutter receives drainage from both sides. On the left it drains a rectangular 600-acre area of tc = 60 min. On the right it drains a relatively steep 300-acre area of tc = 10 min. The ϕ index on both sides is 0.5 in./hr. Use the intensity–duration–frequency curves in Fig. 11.6 to determine the peak discharge (in cfs) with a 25-year recurrence interval for (a) the 600-acre area alone, (b) the 300-acre area alone, and (c) the combined area, assuming that the proportion of the 600-acre area contributing to runoff at any time t after rain begins is t/60.
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