8-144 Water at 15C is to be discharged from a reservoir at a rate of 18L/s using two horizontal cast iron pipes connected in series and a pump between them. The first pipe is 20m long and has a 6cm diameter, while the second pipe is 35m long and has a 4cm diameter. The water level in the reservoir is 30m above the centerline of the pipe. The pipe entrance is sharp-edged, and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head and the minimum pumping power to maintain the indicated flow rate. FIGURE P8-144