Discharge coefficient of broad-crested weirs as a function of the relative weir height for different weir lengths

Zhuk, Volodymyr; Matlai, Ivan; Popadiuk, Ihor; Вовк, Леся; Rehush, Vladyslav

doi:10.23939/jtbp2020.02.063

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Water head, over the 90° triangular sharp crested weir, were measured with a level gauge with an accuracy of 0.5 mm. Water flow rate Q over the triangular weir was determined by the King's formula (Zhuk et al, 2020):…”

Section: Methodsmentioning

confidence: 99%

The Use of an Ultrasonic Flow Meter in the Zone of Influence of Indirect Sections of the Water Pipeline

Bosak¹,

Matlai²,

Hvozdetskyi³

et al. 2022

Theory build. pract.

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The accuracy of water flow rate measurement with an ultrasonic flow meter (UFM) is affected by pipeline conditions. On water pipelines, there is often no the required length of direct section, required by the device passport or regulatory documents. Therefore, we conducted experiments using UFM to measure water flow rate in the zone of influence of non-direct sections of the water pipeline. The flow rate was measured in two planes of the pipeline with an offset of 90 o and the average value was taken. Thus, it was expected to take into account the average water velocity for the asymmetric velocity profile. The results of water flow rate measuring with UFM on short direct sections of the water pipeline, limited by pipeline bends sudden constriction of the pipeline, are presented. The greatest influence on the UFM measurement error is the 90 o pipeline bends.

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Section: Methodsmentioning

confidence: 99%

The Use of an Ultrasonic Flow Meter in the Zone of Influence of Indirect Sections of the Water Pipeline

Bosak¹,

Matlai²,

Hvozdetskyi³

et al. 2022

Theory build. pract.

View full text Add to dashboard Cite

show abstract

“…Other researchers [Hager & Schwalt, 1994;Zhuk et al, 2020a] determine the flow rate using the formula of another structure:…”

Section: Introductionmentioning

confidence: 99%

Discharge Coefficient of Rectangular Broad-Crested Weirs in Narrow Channels with High Relative Length of the Threshold

Zhuk¹,

Вовк²,

Popadiuk³

et al. 2021

Ecol. Eng. Environ. Technol.

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Broad-crested weirs (BCW) are commonly used elements of stormwater systems and different open-channel hydraulic structures. Specific features of stormwater drainage channels are small width, low flow depths and, accordingly, small overflow heads at weirs. Dependences of the discharge coefficient of narrow (b = 0.224 m) rectangular sharp-edged broad-crested weirs with vertical walls, threshold height of 0.05 m and threshold length of 0.05-0.2 m were obtained experimentally. The experimental values of the discharge coefficient were approximated by the power-law functions of relative length of the weir. At large values of the relative length of the threshold (L/h> 10), for all weirs was obtained the same tendency of decreasing the discharge coefficient with increasing L/h ratio that can be explained by the enlargement of the hydraulic friction along the weir with increasing L/h ratio.

show abstract

Discharge coefficient of broad-crested weirs as a function of the relative weir height for different weir lengths

Zhuk¹,

Matlai²,

Popadiuk³

et al. 2020

Theory build. pract.

Self Cite

View full text Add to dashboard Cite

Broad-crested weirs (BCW) are often used in hydraulic engineering and water management. The most complex factor that affects the discharge capacity of BCW is the discharge coefficient. In Ukrainian engineering practice, the flow rate of BCW is defined as a function of the relative height of the spillway wall, while in the most common European methods – as a function of the relative length of the weir. The experimental dependences of the discharge coefficient of rectangular sharp-edged BCW with vertical inlet and outlet walls with the ratio of the weir length and height d/Р = 2; 4 are obtained. A comparison of the obtained results with the values of the discharge coefficient of the same BCW using the methods of Kumin and Hager indicates that this coefficient depends on both the height of the wall and the length of the weir. The corresponding empirical power law dependences are obtained. At the same values of the relative height of the wall, the discharge coefficient for the weir with the ratio d/Р = 4 is significantly lower comparing the weir with d/Р = 2, that can be explained by the more significant effect of friction resistance for the weir with longer threshold.

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Discharge coefficient of broad-crested weirs as a function of the relative weir height for different weir lengths

Cited by 3 publications

References 12 publications

The Use of an Ultrasonic Flow Meter in the Zone of Influence of Indirect Sections of the Water Pipeline

The Use of an Ultrasonic Flow Meter in the Zone of Influence of Indirect Sections of the Water Pipeline

Discharge Coefficient of Rectangular Broad-Crested Weirs in Narrow Channels with High Relative Length of the Threshold

Discharge coefficient of broad-crested weirs as a function of the relative weir height for different weir lengths

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