are, respectively, 196 kN/m and 170 kN/m . Calculate the diameter of the throat.

3.13 In the following figure, the diameter of the pipe D is 35 cm and the throat diameter of the venturi meter d is 15 cm. What is the discharge if H = 5 m?

3.14 The manometer deflection of a venturi meter in terms of equivalent water is 205 mm. If the throat diameter is 112.1 mm and the venturi is used to measure flow in a 250-mm pipe, calculate the rate of discharge.

3.15 If the manometer deflection in terms of equivalent water is 112.1 mm, what is the actual deflection if mercury is used as the indicator fluid?

3.16 Water at 20°C flows through a venturi meter that has a throat of 25 cm. The venturi meter is measuring the flow in a 65-cm pipe. Calculate the deflection in a mercury manometer if the rate of discharge is 0.70 m /s.

3.17 Design a Parshall flume to measure a range of flows of 20 cfs to 100 cfs.

3.18 The throat width of a Parshall flume is 2.0 ft. If the discharge flow is 30 cfs, calculate the upstream head Ha.

3.19 The invert elevation of the outgoing sewer in Problem 3.17 has been set at 99.44 ft. At what elevation is the invert elevation of the incoming sewer set?

3.20 As an exercise, read off from Figure 3.10 at 1-h intervals and compare your results with the results of Example 3.8.

3.21 Solve Example 3.8 by assuming 12 intervals and compare your results with the values you read from the figure at 2-h intervals.

3.22 In Figure 3.10, how should the values at time 0 and time 24 hours later compare? Why?

3.23 Compute the equalized flow in Example 3.8 if the number of intervals is 48.

3.24 Compute the equalized flow in Example 3.8 if the number of intervals is 12. What is the other name of equalized flow?

3.25 In calculating the equalized values of the quality, the calculation should start when the tank is full. Is this a valid statement? If the calculation is not to start when the tank is full, when then should it be started and why?

3.26 The equalized volume is not the volume of the equalization basin. Is this statement true?


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