Water flows through the pipe contraction as shown in the figure. The drop in the piezometer level after contraction is 0.1 ft. Determine the flow rate as a function of the small pipe diameter, D. What is the flow rate if D = 6 in.

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Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?