What size pipe can carry 2.36 m'/s at an average velocity of 3.0 m/s? Ans. 1 m A 12" pipe carrying 3.93 cfs connects to a 6" pipe. Find the velocity head in the 6" pipe. Ans. 6.21 ft Compute the lost head in a 150-mm pipe if it is necessary to maintain a pressure of 231 kPa upstream and 1.83 m below where the pipe discharges water into the atmosphere at the rate of 0.0556 m'/s. 4 a point Ans. 21.7 m 2. 3.