Problems

3.1 The system in Figure 3.1 is indicating a flow of 0.3 m3/s. The head over the weir and its length are 0.2 m and 2 m, respectively. Calculate the height of the weir.

3.2 The system in Figure 3.1 is indicating a flow of 0.3 m3/s. The head over the weir and its height are 0.2 m and 1 m, respectively. Calculate the length of the weir.

3.3 The head over a fully contracted weir of length equal to 2 m is 0.2 m. If the height of the weir is 1 m, what is the discharge?

3.4 A suppressed weir measures a flow in an open channel at a rate of 0.3 m /s. The length and head over the weir are 0.2 m and 2.0 m, respectively. Calculate the height of the weir.

3.5 A suppressed weir measures a flow in an open channel at a rate of 0.3 m /s. The height and head over the weir are 1 m and 0.2 m, respectively. Calculate the length of the weir.

3.6 The head over a suppressed weir of length equal to 2 m is 0.2 m. If the height of the weir is 1 m, what is the discharge?

3.7 The head over a Cipolleti weir of length equal to 2 m is 0.2 m. If the height of the weir is 1 m, what is the discharge?

3.8 Two triangular weirs are put in series in an open channel. The upstream weir has a notch of 60° while the downstream weir has a notch of 90°. If the head over the 90-degree notched weir is 0.5 m, what is the head over the 60-degree notched weir?

3.9 Two weirs are placed in series in an open channel. The upstream weir is a Cipolleti weir and the other is a 90-degree notched weir. What is the discharge through the Cipolleti weir if the head over the notched weir is 0.5 m?

3.10 A suppressed weir is placed upstream of a V-notch weir in an open channel. The height and head over the weir of the upstream weir are 1 m and 0.2 m, respectively. Calculate the length of the suppressed weir if the head over the V-notch weir is 0.5 m?

3.11 The upstream diameter of a venturi meter is 150 mm and its throat diameter is 75 mm. Determine the pressure at point 1 if the discharge is 0.031 m3/s. The pressure at point 2 is 170 kN/m2.

3.12 The diameter of a pipe whose discharge flow of 0.031 m3/s as measured by a venturi meter is 150 mm. Pressure readings taken at points 1 and 2

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