Question

Determine the rate of flow of water through a pipe of diameter 20 cm and length 50 m when one end of the pipe is connected to a tank and other end of the pipe is open to the atmosphere.  The pipe is horizontal and the height of water in the tank is 4 m above the centre of pipe.  Consider all minor losses and take
f = 0.009. The loss of head (h_i) at the entrance of a pipe may be taken as