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Extracted text: the TR-55 method, respectively. 4. Problem 3.22 (page 118): A drainage basin has a composite curve number of 78 when it receives a 30- min storm with rainfall of 20, 15, and 5 mm in the first, second, and third 10 min periods, respectively. Determine the direct runoff from the rainfall in each 10 min interval as well as the total direct runoff from the storm using the SCS-CN method. 110L Tho cnil in 1 watcrshed has the following properties: 0, 0.02, 0r3D0.25,