Rainwater flows through the galvanized iron downspout shown in Fig. P8.88 at a rate of 0...

Rainwater flows through the galvanized iron downspout shown in Fig. P8.88 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.