pump transfers water from one reservoir to another through two cast-iron pipes in series. The first is 3000 ft of 9-in.-diameter pipe and the second is 1000 ft of 6-in.-diameter pipe. A constant flow rate of 75 gpm is tapped off at the junction between the two pipes. Obtain and plot the system head versus flow rate curve. Find the delivery if the system is supplied by the pump of Example 10.6 operating at 1750 rpm