1. Water flows downward through a vertical smooth pipe. When the flowrate is 0.5 ft3 /s, there is no change in pressure along the pipe. Determine the diameter of the pipe.
2. Rainwater flows through the galvanized iron downspout shown in Fig. P8.105 at a rate of 0.006 m3 /s. Determine the size of the downspout cross section if it is a rectangle with an aspect ratio
of 1.7 to 1 and it is completely filled with water. Neglect the velocity of the water in the gutter at the free surface and the head loss associated with the elbow.