Abstract
The characteristics of square‐edged and round‐nosed, rectangular, broad‐crested weirs are studied under free‐flow and submergedflow conditions. The discharge coefficient, Cd, 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 Cd, 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 Cd 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 H/P and R/P. The flow‐reduction factor for a given submergenc...
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