Characteristics of Square‐Edged and Round‐Nosed Broad‐Crested Weirs
Publication: Journal of Irrigation and Drainage Engineering
Volume 114, Issue 1
Abstract
The characteristics of square‐edged and round‐nosed, rectangular, broad‐crested weirs are studied under free‐flow and submergedflow conditions. The discharge coefficient, of a weir having height P and length L is found to be a function of the upstream head, H, causing flow and the radius, R, of the upstream top corner. For a given head, under free‐flow conditions, a semiempirical relationship between H/P, and R/P is derived using the momentum relationships. For the square‐edged weir, the effect of nonhydrostatic distribution of pressure is taken into account in the formulation of the momentum equation. In addition, for the round‐nosed weir, new relations are developed to supplement the existing results for square‐edged weirs. Experimental data are presented to validate the proposed dependence of on H/P with R/P as the group parameter. Under drowned‐flow conditions, the submergence limit for a broad‐crested weir varies with the ratios and The flow‐reduction factor for a given submergence is dependent on the degree of rounding of the upstream top corner.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 114 • Issue 1 • February 1988
Pages: 61 - 73
Copyright
Copyright © 1988 ASCE.
History
Published online: Feb 1, 1988
Published in print: Feb 1988
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