A pump developing a pressure of 800kN/m2 is used to purmp water through a 150mm. pipe 300m long to a reservoir 60m higher. With the valves fully open, the flowrate obtained is 0.05m2/s. As a result of corrosion and scaling the effective absolute roughness of the pipe surface increases by a factor of 10. By what percentage is the flowrate reduced? Viscosity of water =1mNsim2. (13