Discharge coefficient of a rectangular sharp-edged broad-crested weir

• Main Authors: Zachoval Zbyněk, Knéblová Michaela, Roušar Ladislav, Rumann Ján, Šulc Jan
• Format: Article
• Language: English
• Published: Sciendo 2014-06-01
• Series: Journal of Hydrology and Hydromechanics
• Subjects: broad-crested weir; discharge coefficient; relative height of weir
• Online Access: https://doi.org/10.2478/johh-2014-0014

This paper is concerned with the determination of the relationship for the calculation of the discharge coefficient at free overflow over a rectangular sharp-edged broad-crested weir without lateral contraction. The determination was made on the basis of new measurement in a range of the relative thickness of the weir from 0.12 to 0.30 and newly in a large range of relative height of the weir extremely from 0.24 to 6.8 which greatly expands the application possibilities of low weirs. In addition, the effects of friction and surface tension on the value of the discharge coefficient were evaluated as well as the effect of the relative thickness of the weir. The new equation for discharge coefficient, expressed using the relative height of the weir, was subjected to verification made by an independent laboratory which confirmed its accuracy.