In a test on a 6 "diameter light oxidation cast iron conduit where the flow rate was 26.5 L / s, the pressure was measured at two points A and B, distant from 1017 m where values of 68.6.104N / m2 and 20.6.104N / m2 respectively. Considering that the difference in quota between A and B was 30m and the quota of A being lower than B.
Determine: the speed of water in the pipe?