A reservoir delivers water to a horizontal pipeline 39 long The first 15 m has a diameter of 50 mm, after which it suddenly beco
mes 75 mm. The outlet of the reservoir is sharp. The flow rate is 2,8 l/s to atmosphere. Take f=0,0048 for the 50 mm pipe and f=0,0058 for the 75 pipe. Determine the difference between the vater level in the reservoir and the outlet of the pipe.