Use the rational method to calculate the peak rates of flow for the drainage area described in Problem 3.27 for the storms of 2-, 10-, and 100-year frequency. Use the New Jersey rainfall intensity–duration–frequency (IDF) curves of Figure 3.1b for this area. Base your calculations on the following runoff coefficients:

a. C = 0.95 pavement

b. C = 0.30 lawn

c. C = 0.25 wooded area