Determine the diameter of commercial steel pipe required to convey a minimum of 300 cfs of water at 60 deg F with a head loss of 1.2 ft per 1000 ft of pipe. Assume pipes are available in the following nominal diameters (inches): 2, 4, 6, 8, 12, 14, 16, 18, 20, 22, 24, 30, 36, 42, 48, 54, 60, 66, 72