A water reservoir of 300 (Height) x 300 (width) x 500 (depth) m has its free surface at 250 m above a bottom outlet orifice of 500 mm in diameter. The velocity coefficient of the orifice is 0.96 and the coefficient of contraction of the flow through the orifice is 0.6. Assume that the reservoir has a cubic shape. Q1. Calculate the velcoity of water in the reservoir when it starts to empty (m/s)

A dam releases water into a spillway, and then some distance downstream a hydraulic jump occurs. The dam height is 25 m, the initial depth in the spillway is 1 m, and the hydraulic jump leads to a region of depth 15 m. Upstream of the dam may be considered a reservoir. Determine the average velocity before the jump and whether the jump will occur. If there will be a jump, determine the velocity after the hydraulic jump, neglecting any friction losses.

Problem 4. A 2-mm-diameter tube is used to siphon water at 20° C from a tank. When the tube length is 1 m, is there a value for H that exceeds the limit for laminar flow? If the maximum H = 75 cm, what would be the maximum flow rate? Neglect losses due to curvature and entrance effects. L=1m,d=2mm Water at 20°C H

Water flows in a rectangular channel at a depth of 1.5 m. A 30 cm high smooth hump produces a drop of 15 cm in the water surface elevation. Neglecting losses, estimate the discharge per unit width of the channel. Solution: Refer to Figure 2.18. Let suffixes 1 and 2 refer to sections upstream of the hump and on the hump respectively as indicated in the figure. Energy Line V Е, У, 1 0.15 m √₂ Hump AZ = 0.30 m 2